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Sorry if my English won't be clear for you, I'm a Russian student.
I have a code of a class with function declarations:
Account.h
class Account {
public:
Account();
virtual ~Account() = 0;
void tedt(const std::string &);
Account(std::string);
}
Account.cpp:
#include "Account.h"
void Account::tedt(const std::string& a) <===== error here
{
return;
}
Account::Account()
{
Account(""); <==== some other error is here...
}
Account::Account(std::string input) <===== and here!!!
{
SetLogin(input);
SetProxy("");
}
I see this message:
error: out-of-line definition of 'tedt' does not match any declaration in 'Account'
end this
error: out-of-line definition of 'Account' does not match any declaration in 'Account' (about Account::Account(std::string input))
And I don't know to do. I'm using qt creator for coding if it is important
As pointed out, you need to put a semicolon after the closing bracket of your class definition.
Please also note that your constructor without arguments will not work as expected here. Instead, you create a new temporary object with the argument. This will not change your current object. Better use:
Account::Account() : Account("") {}
, which works as expected.
Related
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Stack::Stack(const Stack& copy)
{
Stack temp;
copyHelper(copy.top, temp);
}
void Stack::copyHelper(Node* top, Stack newStack) {
if (top != nullptr)
{
copyHelper(top->getNext(), newStack);
newStack.push(top->getPayload());
}
}
I'm getting three errors related to the code block above:
Error C2600 'Stack::Stack': cannot define a compiler-generated special member function (must be declared in the class first) Program5 C:\Users\tcran\source\repos\Program5\Program5\Stack.cpp 14
Error C2264 'Stack::Stack': error in function definition or declaration; function not called Program5 C:\Users\tcran\source\repos\Program5\Program5\Stack.cpp 16
Error C2264 'Stack::Stack': error in function definition or declaration; function not called Program5 C:\Users\tcran\source\repos\Program5\Program5\Stack.cpp 23
Can someone please elaborate on why I am getting this errors?
class Stack
{
public:
// this constructor has not been specified in your class definition.
Stack(const Stack& copy);
};
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I am learning my first programming language C++ and I have issues with making a private function public. Can you guys help me to find the problem?
#include <iostream>
#include <string>
using namespace std;
class JadClass
{
public:
void setName(string x)
{
name = x;
}
string getName()
{
return name;
}
private:
string name;
};
int main()
{
JadClass jc;
jc.setName = "Jad Charara w\n";
cout << jc.getName();
system("pause");
return 0;
}
instead of
jc.setName = "Jad Charara w\n";
write
jc.setName("Jad Charara w\n");
First of all you have defined 2 functions in class JadClass with public access specifier,so please confirm access specifier of which function you want to change from private to public.
Second thing in main you are trying to call setName function.
jc.setName = "Jad Charara w\n";
The above function call should be in jc.setName("Jad Charara w\n"); format.
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Im trying to create a simple thread and have it execute.
My function definition is:
void MyClass::myFunction()
{
//Do Work
}
I'm creating the thread and executing it:
std::thread t1(myFunction);
Upon compiling my code, i get the following error:
error C3867: function call missing argument list; use '&MyClass::myfunction' to create a pointer to member.
Since my function does not take any parameters, i'm assuming i'm declaring it wrongly where i'm creating my thread? Any help will be appreciated, Thanks!!
If your method is a non-static member : You need an instance of your object to call the member function on.
If your method is static member, do what the compiler suggest : simply pass the address of your function.
Example:
class A
{
public:
void foo() { cout << "foo"; }
static void bar() { cout << "bar"; }
};
int main() {
std::thread t1(&A::foo, A()); // non static member
t1.join();
std::thread t2(&A::bar); // static member (the synthax suggested by the compiler)
t2.join();
return 0;
}
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It is possible somehow to a call a non-member function from a member function?
Something like this:
class A {
int a;
public:
bool (int b) {
smt;
lala = define_smt(smt);
if (lala < 5) {
return true;
}
else {return false}
}
}
int define_smt(smt){ ...}
Thnaks in advance
The function must be known at call time. That means you must declare it before you use it. You have basically two choices here: Either put the whole function before the class, or use a function prototype before the class. So either:
int define_smt(smt) { ... }
class A {
// ...
}
or:
int define_smt(smt);
class A {
// ...
}
int define_smt(smt) { ... }
Of course It is Possible. As long as your function is available in the current context. i.e. either a prototype or a defination should be available, before the point of calling.
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I keep getting the error "macro names must be identifiers" in the following code, and I'm not sure why. I haven't violated any of the naming standards as far as I know. This is from my "dllist.h" file:
#ifndef _DOUBLY_LINKED_LIST_
#define _DOUBLY_LINKED_LIST_
template <class T>
class IntDLLNode {
friend class IntDLList;
public:
IntDLLNode() {next = prev = NULL;}
IntDLLNode(const T& el, IntDLLNode *n = NULL, IntDLLNode *p = NULL) {
info = el;
next = n;
prev = p;
}
protected:
T info;
IntDLLNode<T> *next, *prev;
};
template <class T>
class IntDLList {
public:
IntDLList() {head = tail = NULL;}
void addToDLLTail(const T& el);
void addToDLLHead(const T& el);
T deleteFromDLLTail();
T deleteFromDLLHead();
void deleteNode(int);
void isInList(int) const;
void addSorted(int);
void printList();
private:
IntDLLNode<T> *head, *tail;
};
#endif
I've also tried names like DOUBLY_LINKED_LIST and DOUBLYLINKEDLIST -- all result in the same error.
You are violating a rule. _DOUBLY_LINKED_LIST_ is an invalid identifier. Anything that starts with an underscore, immediately followed by an upper-case character is reserved for the implementation.
Try DOUBLY_LINKED_LIST.
Also try to #include <cstddef> for NULL. Or use 0. Or better yet, if you have C++11 support, use std::nullptr.
try
#if !defined( _DOUBLY_LINKED_LIST_)
instead of
#ifdef _DOUBLY_LINKED_LIST_