I use QT creator and Xcode 4.63 (osx mav)
I just call .set(....) and got following error
no member named 'set' in 'std::vector<int, std::allocator<int> >
seem like something wrong with lib , since I'm new to QT creator i still got no idea how to make it right. (I'm new to c++)
#include <cctype>
#include <cmath>
#include <fstream>
#include <iostream>
#include <sstream>
#include <string>
#include "console.h"
#include "filelib.h"
#include "grid.h"
#include "gwindow.h"
#include "simpio.h"
#include "vector.h"
using namespace std;
int main() {
vector<int> myVector(10,0);
fstream mystream;
string getStream;
while(getline(mystream,getStream)) {
getline(mystream,getStream);
if(stringToInteger(getStream)>=0 && stringToInteger(getStream)<=9) {
myVector.set(0,(myVector[0]+1))
};
}
return 0;
};
The "set" method doesn't exist for vectors in STL. You could use the [] operator if you want to change a value:
myVector[0] = myVector[0] + 1;
or even
myVector[0]++;
Related
I am trying to create a AppServiceConnection but when doing so I get a Incomplete Type not allowed
I verified the header file is imported for that class as mention in other stackoverflow questions.
I tried several different attempted to define the AppServieConnection. Am I putting in the wrong place?
The only way it worked was putting it above the main method.
Here is my code
#include "pch.h"
#include <winrt/Windows.Foundation.h>
#include <winrt/Windows.Foundation.Collections.h>
#include <windows.h>
#include <winrt/Windows.ApplicationModel.Activation.h>
#include <tchar.h>
#include <stdio.h>
#include <ppltasks.h>
#include <appmodel.h>
#include <stdio.h>
#include <tchar.h>
#include <iostream>
#include <string>
#include <ppltasks.h>
#include <windows.h>
#include <appmodel.h>
#include <malloc.h>
#include <stdio.h>
#include <assert.h>
using namespace winrt;
using namespace concurrency;
using namespace Windows::Foundation;
using namespace std;
using namespace Windows::ApplicationModel::AppService;
AppServiceConnection connection_worked; // defining it here works but cannot call any methods from it
int main()
{
init_apartment();
Uri uri(L"http://aka.ms/cppwinrt");
printf("Hello, %ls!\n", uri.AbsoluteUri().c_str());
}
class NewClass {
private:
Windows::ApplicationModel::AppService::AppServiceConnection connection{nullptr};
Windows::ApplicationModel::AppService::AppServiceConnection connection2;
Windows::ApplicationModel::AppService::AppServiceConnection connection3 = nullptr;
AppServiceConnection connection4;
AppServiceConnection connection5 = nullptr;
AppServiceConnection connection6 = AppServiceConnection();
IAsyncAction InitializeAppServiceConnection() {
}
public:
NewClass() {
}
};
The error is clear, you are missing AppServiceConnection header file.
Please add the header file
#include <winrt/Windows.ApplicationModel.AppService.h>
The following gives an error for the code mentioned below.
Where I have gone wrong ?
error: ‘function’ is not a member of ‘std’
I want to make priority queue using C++ std lib queue, and min the queue is that IceCream which takes least time to prep. I have tried implementing this -> declaring a priority_queue in c++ with a custom comparator
#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <map>
#include <vector>
#include <queue>
#include <deque>
#include <iterator>
#include <string>
#include <sstream>
using namespace std;
class IceCream
{
public:
int time_to_prep;
IceCream(int flav) {
time_to_prep = flav;
}
};
bool Compare(IceCream a, IceCream b)
{
return a.time_to_prep > b.time_to_prep;
}
int main()
{
priority_queue<IceCream, vector<IceCream>, std::function<bool(IceCream a, IceCream b)> > my_pq(Compare);
my_pq.push(IceCream(4));
my_pq.push(IceCream(33));
my_pq.push(IceCream(9));
cout << my_pq.top() << endl;
return 0;
}
#include <functional>
You need this include to get access to std::function
See: http://en.cppreference.com/w/cpp/utility/functional/function
I am having problems running functions within a custom class. Here is my code:
ROBOTSTRUCTURE.H
#pragma once
#include "math.h"
#include <fstream>
#include <string>
#include <thread>
#include <chrono>
#include <ctime>
#include <vector>
#include <sstream>
#include <fstream>
using namespace std;
using namespace std::chrono;
class RobotStructure
{
bool faceTrackingEnabled;
public:
RobotStructure();
~RobotStructure();
bool testFunction(string input);
ROBOTSTRUCTURE.CPP
#include "RobotStructure.h"
RobotStructure::RobotStructure()
{
faceTrackingEnabled = true;
}
RobotStructure::~RobotStructure()
{
}
bool RobotStructure::testFunction(string input)
{
cout << input << endl; //THIS DOES NOT WORK, When using debugger shows that the entire class "Robot Structure" as unable to read memory
return true;
}
MAIN
#include <Windows.h>
#include <iostream>
#include <iomanip>
#include <ctime>
#include <chrono>
#include <thread>
#include <string>
#include <sstream>
#include <vector>
#include <math.h>
#include <fstream>
#include "RobotStructure.h"
using namespace std;
int main()
{
RobotStructure *mybot= new RobotStructure();
mybot->testFunction("test");
return 0;
}
If a set a breakpoint in main, my class is initialized correctly and everything is fine. As soon as a call the "test function" the class falls out of memory within the test function.
When it goes back to main just before return 0; the class is also out of memory. As if the pointer is deleted somehow. Can someone please explain what is happening and what did I do that is wrong?
You declared the function as bool testFunction(string input) but the function is not returning anything. This leads to undefined behavior in C++.
In addition your example wouldn't compile (you declared an argument input but you are using intput).
Your testFunction does not use any class members. If you compile this code with optimization enabled ("Release"-Configuration in VisualStudio, -O2 on gcc), the compiler might render some variables (like this) "undebuggable".
I have a problem with the next code, I get the error: invalid type argument of unary '*' (have 'int'). If I write int *content that allows the code to run, but I have to write int=content and change the code *((ptab->content)+pC1+17), I tried but I can't fix the error.
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <conio.h>
#include <iomanip>
#include <stdio.h>
#include <Windows.h>
using namespace std;
struct box{
int content;
};
struct box *ptab;
int pC1=5;
int main (){
ptab=new struct box[64];
if (*((ptab->content)+pC1+17)==0) {
pC1=pC1+17;
}
cout<<pC1<<endl;
}
I have to pass from pointers to poninters to struct arrays, this code is an example, because the original code has 23000 lines.
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <conio.h>
#include <iomanip>
#include <stdio.h>
#include <Windows.h>
using namespace std;
int *box;
int pC1=5;
int main (){
box=new int[64];
if (*(box+pC1+17)==0){
pC1=pC1+17;
}
cout<<pC1<<endl;
}
With *((ptab->content)+pC1+17), an easier way to say it is ptab[pC1+17].content [the latter compiles and produces 22 as output]. Did you mean that or ptab->content + pC1 + 17 [which produces 5]?
the code is
#include <ctime>
#include <iostream>
#include <fstream>
#include <sstream>
#include <cstdlib>
#include <iterator>
#include <queue>
#include <algorithm>
#include <string>
#include <cassert>
#include <cmath>
#include <iomanip>
#include <new>
#include <algorithm>
#include <functional>
#include <vector>
using namespace std;
using std::vector;
#include <boost/numeric/ublas/matrix.hpp>
#include <boost/numeric/ublas/io.hpp>
#include <boost/numeric/ublas/operation.hpp>
#include <boost/numeric/ublas/vector.hpp>
using namespace boost::numeric::ublas;
boost::numeric::ublas::matrix<double> A_MATRIX(A_MATRIX_ROWS,A_MATRIX_COLUMNS);
boost::numeric::ublas::matrix<double> Y_MATRIX(A_MATRIX_ROWS,1);
vector <double> GPSR_BB(boost::numeric::ublas::matrix<double> &f_Y_MATRIX,boost::numeric::ublas::matrix<double> &f_A_MATRIX,int f_tau,int f_tolA){
vector<double> objective(2);
//sth inside function
return objective;
}
int main(){
vector<double> objectives(maxiter+2);
objectives=GPSR_BB(Y_MATRIX,A_MATRIX,tau,tolA);
return 0;
}
in line
vector <double> GPSR_BB(boost::numeric::ublas::matrix<double> &f_Y_MATRIX,boost::numeric::ublas::matrix<double> &f_A_MATRIX,int f_tau,int f_tolA){
I receive error
error: expected constructor, destructor, or type conversion before ‘<’ token function
I guess, the problem is because of matrix data type, from boost library, which I have to pass to function, I don't think there is another way I can do for my specific problem.
Any help is greatly appreciated. Thank you
boost::numeric::ublas has vector as well as namespace std. Try removing using namespace std and using the appropriate namespace to refer to the correct type.
Try without a space between vector and <double>
vector<double> GPSR_BB