Question

所以我试图通过SFML创建一个线程，但我的代码只是生成一个错误，我一直试图修复几个小时。

这是我不断得到的错误：

    d:\c++\engine\deps\sfml-2.1\include\sfml\system\thread.inl(39): error C2064: term does not evaluate to a function taking 0 arguments
1>          d:\c++\engine\deps\sfml-2.1\include\sfml\system\thread.inl(39) : while compiling class template member function 'void sf::priv::ThreadFunctor<T>::run(void)'
1>          with
1>          [
1>              T=Thread *
1>          ]
1>          d:\c++\engine\deps\sfml-2.1\include\sfml\system\thread.inl(70) : see reference to class template instantiation 'sf::priv::ThreadFunctor<T>' being compiled
1>          with
1>          [
1>              T=Thread *
1>          ]
1>          d:\c++\engine\src\engine\thread.cpp(20) : see reference to function template instantiation 'sf::Thread::Thread<Thread*>(F)' being compiled
1>          with
1>          [
1>              F=Thread *
1>          ]

这是我的线程代码

#include "Thread.h"

Thread::Thread(void)
{
    threadRunning = false;
}

ThreadException::ThreadException(string err)
{
    this->err = err;
}

void Thread::Begin()
{
    if(threadRunning == true) {
        throw ThreadException("Thread already running");
    }

    threadRunning = true;
    sf::Thread thread = (&Thread::ThreadProc, this);
    thread.launch();
}

bool Thread::IsRunning()
{
    return threadRunning;
}

Thread.cpp

#pragma once

#include <SFML\System.hpp>
#include <iostream>
using namespace std;

class Thread
{
private:
    bool threadRunning;
public:
    void Begin();

    Thread();

    bool IsRunning();

    void ThreadProc();
};

class ThreadException : public exception
{
public:
    const char * what() const throw()
    {
        return "Thread Exception";
    }
    std::string err;
    ThreadException(string err);
    ~ThreadException() throw() {};
};

所以我需要的是修复或解释这里发生了什么我已经尝试了一切我能想到的解决这个问题

Answer 1

您的功能绑定错误。
如果绑定正确，则不需要“this”参数。

您没有提供ThreadProc功能的实现。

void Thread::Begin()
{
    if(threadRunning == true) 
        {
            throw ThreadException("Thread already running");
        }

    threadRunning = true;

    std::function<void(void)> f = std::bind(&Thread::ThreadProc, this);

    sf::Thread thread = (f); // Don't need to use = here either, just call the ctor directly
    thread.launch();
}

void Thread::ThreadProc()
{

}

有关详细信息，请参阅此问题：

Using generic std::function objects with member functions in one class

编辑：此外，如果您不使用赋值运算符并直接调用构造函数，那么您当前的语法将起作用。

所以：

sf::Thread thread(&Thread::ThreadProc, this);

不

sf::Thread thread = (&Thread::ThreadProc, this);

SFML中的线程创建错误

1 个答案: