I'm studying Beginning C++ Through Game Programming
In the book I have this example:
#include <iostream>
#include <cstdlib>
#include <ctime>
using namespace std;
int main (){
string word1 = "Game";
string word2("Over");
string word3(3, '!');
string phrase= word1 + word2 + word3;
string phrase= word1 + "" + word2 + word3;
cout<< " The phrase is: " << phrase << "\n \n";
cout<< " The phrase has " << phrase.size() << "on it! \n\n";
cout<< " The character at position 0 is " << phrase[0] << "on it! \n\n";
cout<< "Changing the character at position 0 \n\n";
phrase[0] = 'V';
cout << "The phrase now is " << phrase << "\n\n";
for( unsigned int i=0; i < phrase.size() ; i++){
cout << " Character at position "<< i << "is : " << phrase[i] << "\n" ;
}
cout << "The word 'Over' begin at " << phrase.find("Over") << endl;
if (phrase.find("eggplant")==string::npos)
{
cout<<"'Eggplant' is not in the phrase"<<endl;
}
phrase.erase(4,5);
cout<<"phrase now is" << phrase << endl;
phrase.erase();
if(phrase.empty())
{
cout << "phrase is empty" << endl;
}
getchar();
}
When I try to run the code, the debug gives me back this:
1>------ Build started: Project: GameTestExample, Configuration: Debug Win32 ------
1> gameover.cpp
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2784: 'std::_String_iterator<_Mystr> std::operator +(_String_iterator<_Mystr>::difference_type,std::_String_iterator<_Mystr>)' : could not deduce template argument for 'std::_String_iterator<_Mystr>' from 'std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(420) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(420) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(420) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(420) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2784: 'std::_String_const_iterator<_Mystr> std::operator +(_String_const_iterator<_Mystr>::difference_type,std::_String_const_iterator<_Mystr>)' : could not deduce template argument for 'std::_String_const_iterator<_Mystr>' from 'std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(288) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(288) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(288) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(288) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2784: 'std::move_iterator<_RanIt> std::operator +(_Diff,const std::move_iterator<_RanIt> &)' : could not deduce template argument for 'const std::move_iterator<_RanIt> &' from 'std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1947) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1947) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1947) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1947) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2784: 'std::_Array_iterator<_Ty,_Size> std::operator +(_Array_iterator<_Ty,_Size>::difference_type,std::_Array_iterator<_Ty,_Size>)' : could not deduce template argument for 'std::_Array_iterator<_Ty,_Size>' from 'std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1801) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1801) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1801) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1801) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2784: 'std::_Array_const_iterator<_Ty,_Size> std::operator +(_Array_const_iterator<_Ty,_Size>::difference_type,std::_Array_const_iterator<_Ty,_Size>)' : could not deduce template argument for 'std::_Array_const_iterator<_Ty,_Size>' from 'std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1662) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1662) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1662) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1662) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2784: 'std::reverse_iterator<_RanIt> std::operator +(_Diff,const std::reverse_iterator<_RanIt> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1226) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1226) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1226) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1226) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2784: 'std::_Revranit<_RanIt,_Base> std::operator +(_Diff,const std::_Revranit<_RanIt,_Base> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1031) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1031) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1031) : see declaration of 'std::operator +'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1031) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14): error C2676: binary '+' : 'std::string' does not define this operator or a conversion to a type acceptable to the predefined operator
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2374: 'phrase' : redefinition; multiple initialization
1> c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(14) : see declaration of 'phrase'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2784: 'std::_String_iterator<_Mystr> std::operator +(_String_iterator<_Mystr>::difference_type,std::_String_iterator<_Mystr>)' : could not deduce template argument for 'std::_String_iterator<_Mystr>' from 'const char [1]'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(420) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2784: 'std::_String_const_iterator<_Mystr> std::operator +(_String_const_iterator<_Mystr>::difference_type,std::_String_const_iterator<_Mystr>)' : could not deduce template argument for 'std::_String_const_iterator<_Mystr>' from 'const char [1]'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstring(288) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2784: 'std::move_iterator<_RanIt> std::operator +(_Diff,const std::move_iterator<_RanIt> &)' : could not deduce template argument for 'const std::move_iterator<_RanIt> &' from 'const char [1]'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1947) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2784: 'std::_Array_iterator<_Ty,_Size> std::operator +(_Array_iterator<_Ty,_Size>::difference_type,std::_Array_iterator<_Ty,_Size>)' : could not deduce template argument for 'std::_Array_iterator<_Ty,_Size>' from 'const char [1]'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1801) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2784: 'std::_Array_const_iterator<_Ty,_Size> std::operator +(_Array_const_iterator<_Ty,_Size>::difference_type,std::_Array_const_iterator<_Ty,_Size>)' : could not deduce template argument for 'std::_Array_const_iterator<_Ty,_Size>' from 'const char [1]'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1662) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2784: 'std::reverse_iterator<_RanIt> std::operator +(_Diff,const std::reverse_iterator<_RanIt> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const char [1]'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1226) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2784: 'std::_Revranit<_RanIt,_Base> std::operator +(_Diff,const std::_Revranit<_RanIt,_Base> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const char [1]'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1031) : see declaration of 'std::operator +'
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(15): error C2676: binary '+' : 'std::string' does not define this operator or a conversion to a type acceptable to the predefined operator
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(17): error C2088: '<<' : illegal for class
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(20): error C2088: '[' : illegal for class
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(23): error C2088: '[' : illegal for class
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(24): error C2088: '<<' : illegal for class
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(28): error C2088: '[' : illegal for class
1>c:\users\victor\documents\visual studio 2012\projects\gametestexample\gametestexample\gameover.cpp(37): error C2088: '<<' : illegal for class
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
So, My point is, What's exactly going on? Can't realize if this is problem such as "Old syntax" which I never seen something like that before or if the code is wrong (what I can't believe too, No one would do a fail like that in a book)
I'm using Microsoft Visual Studio Premium 20112 as development environment
Use #include <string> too.
Related
My thread gives me no errors before compilation, but upon compilation, I get this error...
Error code:
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(55,14): error C2672: 'invoke': no matching overloaded function found
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(62): message : see reference to function template instantiation 'unsigned int std::thread::_Invoke<_Tuple,0,1,2,3,4>(void *) noexcept' being compiled
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(66): message : see reference to function template instantiation 'unsigned int (__cdecl *std::thread::_Get_invoke<_Tuple,0,1,2,3,4>(std::integer_sequence<size_t,0,1,2,3,4>) noexcept)(void *) noexcept' being compiled
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(89): message : see reference to function template instantiation 'void std::thread::_Start<_Ty,std::vector<std::string,std::allocator<std::string>>&,std::vector<std::string,std::allocator<std::string>>&,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>&,std::vector<std::string,std::allocator<std::string>>&>(_Fn &&,std::vector<std::string,std::allocator<std::string>> &,std::vector<std::string,std::allocator<std::string>> &,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>> &,std::vector<std::string,std::allocator<std::string>> &)' being compiled
1> with
1> [
1> _Ty=void (__cdecl MyFrame::* )(std::vector<std::string,std::allocator<std::string>>,std::vector<std::string,std::allocator<std::string>>,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>,std::vector<std::string,std::allocator<std::string>>),
1> _Fn=void (__cdecl MyFrame::* )(std::vector<std::string,std::allocator<std::string>>,std::vector<std::string,std::allocator<std::string>>,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>,std::vector<std::string,std::allocator<std::string>>)
1> ]
1>C:\Users\Me\C++\Data-Mange-Bot-C++ver\DataManageApp\main.cpp(2578): message : see reference to function template instantiation 'std::thread::thread<void(__cdecl MyFrame::* )(std::vector<std::string,std::allocator<std::string>>,std::vector<std::string,std::allocator<std::string>>,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>,std::vector<std::string,std::allocator<std::string>>),std::vector<std::string,std::allocator<std::string>>&,std::vector<std::string,std::allocator<std::string>>&,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>&,std::vector<std::string,std::allocator<std::string>>&,0>(_Fn &&,std::vector<std::string,std::allocator<std::string>> &,std::vector<std::string,std::allocator<std::string>> &,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>> &,std::vector<std::string,std::allocator<std::string>> &)' being compiled
1> with
1> [
1> _Fn=void (__cdecl MyFrame::* )(std::vector<std::string,std::allocator<std::string>>,std::vector<std::string,std::allocator<std::string>>,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>,std::vector<std::string,std::allocator<std::string>>)
1> ]
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(51,5): error C2893: Failed to specialize function template 'unknown-type std::invoke(_Callable &&,_Ty1 &&,_Types2 &&...) noexcept(<expr>)'
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\type_traits(1482): message : see declaration of 'std::invoke'
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(51,5): message : With the following template arguments:
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(51,5): message : '_Callable=void (__cdecl MyFrame::* )(std::vector<std::string,std::allocator<std::string>>,std::vector<std::string,std::allocator<std::string>>,std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>,std::vector<std::string,std::allocator<std::string>>)'
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(51,5): message : '_Ty1=std::vector<std::string,std::allocator<std::string>>'
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(51,5): message : '_Types2={std::vector<std::string,std::allocator<std::string>>, std::vector<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>,std::allocator<std::variant<std::string,std::vector<std::string,std::allocator<std::string>>>>>, std::vector<std::string,std::allocator<std::string>>}'
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\thread(51,5): error C2780: 'unknown-type std::invoke(_Callable &&) noexcept(<expr>)': expects 1 arguments - 5 provided
1>C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Tools\MSVC\14.32.31326\include\type_traits(1476): message : see declaration of 'std::invoke'
This is despite following the solution provided in this question. Although the difference here is that I have multiple parameters and I'm starting the thread inside another member function.
I've looked at online resources and haven't turned up anything, if anyone can help that would be great.
Code:
class MyFrame : public wxFrame{
public:
MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
private:
void RightSearchBarTextChange(wxCommandEvent& event);
void RightSearchResultsCreate(std::vector<std::string> CategoryFilterMap, std::vector<std::string> SubCategoryFilterMap, std::vector<std::variant<std::string, std::vector<std::string>>> DateFilterMap, std::vector<std::string> TagFilterMap);
}
void MyFrame::RightSearchBarTextChange(wxCommandEvent& event) {
std::thread thread_object(&MyFrame::RightSearchResultsCreate, RightSearchCategoryFilterSelectedVector, RightSearchSubCategoryFilterSelectedVector, RightSearchDateFilterSelectedVector, RightSearchTagFilterSelectedVector);
thread_object.join();
}
void MyFrame::RightSearchResultsCreate(std::vector<std::string> CategoryFilterMap, std::vector<std::string> SubCategoryFilterMap, std::vector<std::variant<std::string, std::vector<std::string>>> DateFilterMap, std::vector<std::string> TagFilterMap) {
// do stuff here
}
I have a very simple example
#include <iostream>
int main() {
std::cout << "Hello World!" << std::endl;
return 0;
}
If I compile this with Visual Studio Compiler on Visual Studio Community 2019, then it works as expected.
However, when I change the compiler to Intel C++, installed with Intel Parallel Studio 2019, it returns an error
1>------ Build started: Project: Project1, Configuration: Debug x64 ------
1>Source.cpp
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(92): error : expected an identifier
1> !_Is_implicitly_default_constructible<_Uty1>::value || !_Is_implicitly_default_constructible<_Uty2>::value)
1> ^
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(91): error : not a valid member class or function template declaration
1> constexpr explicit(
1> ^
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(91): error : "explicit" is not allowed
1> constexpr explicit(
1> ^
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(93): error : expected a ";"
1> pair() noexcept(
1> ^
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(175): error : expected an identifier
1> constexpr explicit(!is_convertible<const _Other1&, _Ty1>::value // TRANSITION, VSO#946746
1> ^
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(175): error : not a valid member class or function template declaration
1> constexpr explicit(!is_convertible<const _Other1&, _Ty1>::value // TRANSITION, VSO#946746
1> ^
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(175): error : "explicit" is not allowed
1> constexpr explicit(!is_convertible<const _Other1&, _Ty1>::value // TRANSITION, VSO#946746
1> ^
1>
1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.24.28314\include\utility(177): error : expected a ";"
1> pair(const pair<_Other1, _Other2>& _Right) noexcept(is_nothrow_constructible_v<_Ty1, const _Other1&>&&
1> ^
1>
1>compilation aborted for Source.cpp (code 2)
1>Done building project "Project1.vcxproj" -- FAILED.
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
If I comment out the #include <iostream> and std::cout ~~, which is basically an empty program, then it compiles successfully and runs without error.
My system is
OS: 64bit Windows 10 Enterprise
CPU: AMD Ryzen Threadripper 3970X
I had a similar compiling erro:
c:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.28.29333\include\concepts(47): error : expected ';', near '{'
If I Disable the "bullseye coverage 8.9.44" (compatible til VS 2015) my prog compile with success.
#define _CRT_SECURE_NO_WARNINGS
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <map>
#include <iterator>
using namespace std;
int main()
{
map<char*, int> m;
int N;
scanf ("%d", &N);
for (int i = 0; i < N; i++)
{
char name[256], s[256];
scanf ("%s", &name);
gets (s);
m[name]++;
}
map<char*, int>::iterator itr;
for (itr = m.begin(); itr != m.end(); itr++)
printf ("%s %d", itr->first, (itr)->second);
}
This program meant to read number of lines then lines, and then output the number of times each word has been repeated in start of lines
for example with this input:
3
Spain Donna Elvira
England Jane Doe
Spain Donna Anna
I expect :
England 1
Spain 2
but I receive :
Spain 3
and I'm sure the the variable name is what it should be each time but something is wrong with the map.
my build log when I changed it to std::string
1>------ Build started: Project: UVa, Configuration: Debug Win32 ------
1> UVa.cpp
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(180): error C2784: 'bool std::operator <(const std::_Tree<_Traits> &,const std::_Tree<_Traits> &)' : could not deduce template argument for 'const std::_Tree<_Traits> &' from 'const std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(2245) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(179) : while compiling class template member function 'bool std::less<_Ty>::operator ()(const _Ty &,const _Ty &) const'
1> with
1> [
1> _Ty=std::string
1> ]
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\map(194) : see reference to function template instantiation 'bool std::less<_Ty>::operator ()(const _Ty &,const _Ty &) const' being compiled
1> with
1> [
1> _Ty=std::string
1> ]
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\type_traits(743) : see reference to class template instantiation 'std::less<_Ty>' being compiled
1> with
1> [
1> _Ty=std::string
1> ]
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(1028) : see reference to class template instantiation 'std::is_empty<_Ty>' being compiled
1> with
1> [
1> _Ty=std::less<std::string>
1> ]
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\map(67) : see reference to class template instantiation 'std::_Tree<_Traits>' being compiled
1> with
1> [
1> _Traits=std::_Tmap_traits<std::string,int,std::less<std::string>,std::allocator<std::pair<const std::string,int>>,false>
1> ]
1> c:\users\amiraz\documents\visual studio 2012\projects\uva\uva\uva.cpp(13) : see reference to class template instantiation 'std::map<_Kty,_Ty>' being compiled
1> with
1> [
1> _Kty=std::string,
1> _Ty=int
1> ]
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(2245) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(2245) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xtree(2245) : see declaration of 'std::operator <'
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(180): error C2784: 'bool std::operator <(const std::move_iterator<_RanIt> &,const std::move_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::move_iterator<_RanIt> &' from 'const std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1983) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1983) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1983) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1983) : see declaration of 'std::operator <'
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(180): error C2784: 'bool std::operator <(const std::reverse_iterator<_RanIt> &,const std::reverse_iterator<_RanIt2> &)' : could not deduce template argument for 'const std::reverse_iterator<_RanIt> &' from 'const std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1259) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1259) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1259) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1259) : see declaration of 'std::operator <'
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(180): error C2784: 'bool std::operator <(const std::_Revranit<_RanIt,_Base> &,const std::_Revranit<_RanIt2,_Base2> &)' : could not deduce template argument for 'const std::_Revranit<_RanIt,_Base> &' from 'const std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1075) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1075) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1075) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\xutility(1075) : see declaration of 'std::operator <'
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(180): error C2784: 'bool std::operator <(const std::pair<_Ty1,_Ty2> &,const std::pair<_Ty1,_Ty2> &)' : could not deduce template argument for 'const std::pair<_Ty1,_Ty2> &' from 'const std::string'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(232) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(232) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(232) : see declaration of 'std::operator <'
1> c:\program files (x86)\microsoft visual studio 11.0\vc\include\utility(232) : see declaration of 'std::operator <'
1>c:\program files (x86)\microsoft visual studio 11.0\vc\include\xstddef(180): error C2676: binary '<' : 'const std::string' does not define this operator or a conversion to a type acceptable to the predefined operator
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
char* are compared as pointers, not as strings. Use std::string instead.
And as P0W mentioned,scanf, printf, gets are C-style. Maps and iterators are C++-style. Don't mix them. Use std::cin, std::cout, std::getline for IO in C++.
If you map with a char* as a key, you're really mapping the with the address of the string, not the string itself as a key. Since your buffer is identically allocated on the stack every time, it will most likely end up at the same address and map to the same value, no matter the content.
Mapping from std::string, the C++ alternative to C strings, will instead automatically use the content of the string as a key.
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Closed 10 years ago.
#include <iostream>
#include <cmath>
#include <vector>
using namespace std;
int square(int a){
return a*a;
}
struct Point{
int x,y;
};
int distance (const Point& a,const Point& b){
int k=(int) sqrt((float)((a.x-b.x)*(a.x-b.x))+((a.y-b.y)*(a.y-b.y)));
return k;
}
int main(){
vector<Point>a(10);
for (int i=0;i<10;i++){
cin>>a[i].x>>a[i].y;
}
int s=0;
int s1;
int k=0;
for (int i=1;i<10;i++){
s+=square(distance(a[0],a[i]));
}
for (int i=1;i<10;i++){
s1=0;
for (int j=0;j<10;j++){
s1+=square(distance(a[i],a[j]));
if (s1<s) { s=s1; k=i;}
}
}
cout<<k<<"Points are:";
cout<<a[k].x;
cout<<a[k].y;
return 0;
}
i have following code but here is list of errors
1>------ Build started: Project: distance, Configuration: Debug Win32 ------
1> distance.cpp
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2039: 'iterator_category' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(30) : see reference to class template instantiation 'std::iterator_traits<_Iter>' being compiled
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2146: syntax error : missing ';' before identifier 'iterator_category'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2602: 'std::iterator_traits<_Iter>::iterator_category' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(373) : see declaration of 'std::iterator_traits<_Iter>::iterator_category'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(373): error C2868: 'std::iterator_traits<_Iter>::iterator_category' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2039: 'value_type' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2146: syntax error : missing ';' before identifier 'value_type'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2602: 'std::iterator_traits<_Iter>::value_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(374) : see declaration of 'std::iterator_traits<_Iter>::value_type'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(374): error C2868: 'std::iterator_traits<_Iter>::value_type' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2039: 'difference_type' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2146: syntax error : missing ';' before identifier 'difference_type'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2602: 'std::iterator_traits<_Iter>::difference_type' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(375) : see declaration of 'std::iterator_traits<_Iter>::difference_type'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(375): error C2868: 'std::iterator_traits<_Iter>::difference_type' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2039: 'pointer' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2146: syntax error : missing ';' before identifier 'pointer'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2602: 'std::iterator_traits<_Iter>::pointer' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(377) : see declaration of 'std::iterator_traits<_Iter>::pointer'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(377): error C2868: 'std::iterator_traits<_Iter>::pointer' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2039: 'reference' : is not a member of 'Point'
1> d:\c++_algorithms\distance\distance\distance.cpp(9) : see declaration of 'Point'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2146: syntax error : missing ';' before identifier 'reference'
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2602: 'std::iterator_traits<_Iter>::reference' is not a member of a base class of 'std::iterator_traits<_Iter>'
1> with
1> [
1> _Iter=Point
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\xutility(378) : see declaration of 'std::iterator_traits<_Iter>::reference'
1> with
1> [
1> _Iter=Point
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xutility(378): error C2868: 'std::iterator_traits<_Iter>::reference' : illegal syntax for using-declaration; expected qualified-name
1> with
1> [
1> _Iter=Point
1> ]
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
This is caused in part by your use of using namespace std;.
There is a function in the standard library, std::distance, that is used to compute the distance between two iterators into a container. That function is being selected during overload resolution instead of your distance function.
If you don't use using namespace std;, you won't have this problem. Your use of using namespace std; brings all of the names from the std namespace into the global namespace. This is bad because there are a lot of common names in namespace std and it can cause convoluted issues during name lookup, as you've discovered here.
In general, prefer not to use using namespace, especially not at file scope. It's far easier and clearer in the long run to qualify each of the names that you want to use.
#James is right in that getting rid of using namespace std will make this problem go away. But that's not exactly what the actual problem is.
The problem comes from the way names are resolved in C++. C++ uses a very aggressive approach to resolving name lookups when resolving the names of free functions if no suitable class member was found. This is called Argument-dependent name lookup (or ADL), sometimes referred to as Koenig lookup. And at the same time, it is one of the things makes C++ so powerful, but also so deadly and confounding.
Here's the basic problem, simplified.
You call vector::operator[] which returns a vector::reference or a vector::const_reference. You take this return value and call distance() unqualified.
Because distance wasn't found in and applicable class, ADL kicks in, which goes out and gets too many potential matching names.
ADL then goes through the list of candidates and picks "the best match". In this case, the reference that operator[] returns is a closer match to the type expected by std::distance than by your distance, although both are compatible, so std::distance is selected.
Several ways to solve this problem:
Don't using namespace std. Instead, using just the peices you want.
Quantify explicitly which distance you refer to using the scope resolution operator: ::distance()
Change distance to take pointers instead of const &. This effectively turns off ADL.:
Example:
int distance(const Point* a,const Point* b)
s+=square(distance(&a[0],&a[1]));
Additional Resources:
"A Modest Proposal: Fixing ADL (revision 2)" by Herb Sutter
This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.
Closed 12 years ago.
i have following code
#include <stdio.h>
#include <iostream>
#include <algorithm>
#include <string.h>
#include <hash_map>
#include <string>
#include <iterator>
#include <ostream>
using namespace std;
struct Equal
{
bool operator()(const char *s1,const char *s2)const
{
return std::strcmp(s1,s2)==0;
}
};
typedef std::hash_multimap<const char*,int,hash<const char*>,Equal>map_type;
void lookup(const map_type&Map,const char *str){
cout<<str<<":";
pair<map_type::const_iterator ,map_type::const_iterator>p=Map.equal_range(str);
for (map_type::const_iterator i=p.first;i!=p.second;++i)
cout << (*i).second<<" ";
}
int maain(){
map_type m;
m.insert(map_type::value_type("H", 1));
m.insert(map_type::value_type("H", 2));
m.insert(map_type::value_type("C", 12));
m.insert(map_type::value_type("C", 13));
m.insert(map_type::value_type("O", 16));
m.insert(map_type::value_type("O", 17));
m.insert(map_type::value_type("O", 18));
m.insert(map_type::value_type("I", 127));
lookup(M,"I");
lookup(M,"0");
lookup(M,"Rn");
return 0;
}
but here is errors
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2903: 'rebind' : symbol is neither a class template nor a function template
1> c:\program files\microsoft visual studio 10.0\vc\include\xhash(170) : see reference to class template instantiation 'std::_Hmap_traits<_Kty,_Ty,_Tr,_Alloc,_Mfl>' being compiled
1> with
1> [
1> _Kty=const char *,
1> _Ty=int,
1> _Tr=std::hash<const char *>,
1> _Alloc=Equal,
1> _Mfl=true
1> ]
1> c:\program files\microsoft visual studio 10.0\vc\include\hash_map(273) : see reference to class template instantiation 'std::_Hash<_Traits>' being compiled
1> with
1> [
1> _Traits=std::_Hmap_traits<const char *,int,std::hash<const char *>,Equal,true>
1> ]
1> c:\users\7\documents\visual studio 2010\projects\hash_tables\hash_tables\hash_tables.cpp(22) : see reference to class template instantiation 'stdext::hash_multimap<_Kty,_Ty,_Tr,_Alloc>' being compiled
1> with
1> [
1> _Kty=const char *,
1> _Ty=int,
1> _Tr=std::hash<const char *>,
1> _Alloc=Equal
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2039: 'rebind' : is not a member of 'Equal'
1> c:\users\7\documents\visual studio 2010\projects\hash_tables\hash_tables\hash_tables.cpp(11) : see declaration of 'Equal'
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2143: syntax error : missing ';' before '<'
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2039: 'other' : is not a member of '`global namespace''
1>c:\program files\microsoft visual studio 10.0\vc\include\hash_map(27): error C2238: unexpected token(s) preceding ';'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(180): error C2039: 'bucket_size' : is not a member of 'std::hash<_Kty>'
1> with
1> [
1> _Kty=const char *
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(180): error C2065: 'bucket_size' : undeclared identifier
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(184): error C2039: 'allocator_type' : is not a member of 'std::_Hmap_traits<_Kty,_Ty,_Tr,_Alloc,_Mfl>'
1> with
1> [
1> _Kty=const char *,
1> _Ty=int,
1> _Tr=std::hash<const char *>,
1> _Alloc=Equal,
1> _Mfl=true
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(184): error C2146: syntax error : missing ',' before identifier 'allocator_type'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(184): error C2065: 'allocator_type' : undeclared identifier
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(186): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(187): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(188): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(189): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(190): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(191): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(192): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(193): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(197): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2955: 'std::list' : use of class template requires template argument list
1> c:\program files\microsoft visual studio 10.0\vc\include\list(579) : see declaration of 'std::list'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2146: syntax error : missing ';' before identifier 'iterator'
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C3254: 'std::_Hash<_Traits>' : class contains explicit override 'type' but does not derive from an interface that contains the function declaration
1> with
1> [
1> _Traits=std::_Hmap_traits<const char *,int,std::hash<const char *>,Equal,true>
1> ]
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2838: 'type' : illegal qualified name in member declaration
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): error C2208: 'std::iterator' : no members defined using this type
1>c:\program files\microsoft visual studio 10.0\vc\include\xhash(198): fatal error C1903: unable to recover from previous error(s); stopping compilation
1>
1>Build FAILED.
1>
1>Time Elapsed 00:00:01.96
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
please help
You have to look at each complier error and fix them one at a time. We can't take a file of code and fix each error. Learning to live and even on occasion love the abusive spouse that is your complier is part of the process.
All your errors seem related to the fact that you're not passing the right template arguments to hash_multimap. Take a look at hash_multimap's documentation. The last parameter, Èqual` should be the allocator, not a function object, check out the 1st error:
c:\program files\microsoft visual studio 10.0\vc\include\hash_map(26): error C2903: 'rebind' : symbol is neither a class template nor a function template
c:\program files\microsoft visual studio 10.0\vc\include\xhash(170) : see reference to class template instantiation 'std::_Hmap_traits<_Kty,_Ty,_Tr,_Alloc,_Mfl>' being compiled
with
[
_Kty=const char *,
_Ty=int,
_Tr=std::hash,
_Alloc=Equal,
_Mfl=true
]
Edit:
If you've looked at SGI's hash_multimap documentation, you'll notice that the hash_map and hash_multimap classes are different between vendors because they are not standard. The next version of the standard comprises standard hashed containers. In the mean time, well, you'll have to write non portable code!