有人可以帮助我解决我在下面的main中创建线程时遇到的错误吗?
#include "lock_free_queue.h"
#include "Consumer.h"
#include <thread>
int main(){
lock_free_queue* my_queue = new lock_free_queue();
Consumer* c = new Consumer(my_queue);
//Error occurs here I think
std::thread t3(&Consumer::start);
...
t3.join();
Consumer.h(它都在标题中,因为最初打算使用模板):
#ifndef CONSUMER_H
#define CONSUMER_H
#include "lock_free_queue.h"
#include <iostream>
class Consumer{
public:
Consumer(lock_free_queue* queue) : the_queue(queue){}
void start(){
consume = true;
while(consume){
while(the_queue->getSize()==0){}
process();
}
}
我收到此错误(看起来相当可怕):
1>C:Program Files (x86)Microsoft Visual Studio 11.0VCincludefunctional(1152): error C2064: term does not evaluate to a function taking 0 arguments
1> class does not define an 'operator()' or a user defined conversion operator to a pointer-to-function or reference-to-function that takes appropriate number of arguments
1> C:Program Files (x86)Microsoft Visual Studio 11.0VCincludefunctional(1152) : while compiling class template member function 'void std::_Bind<_Forced,_Ret,_Fun,_V0_t,_V1_t,_V2_t,_V3_t,_V4_t,_V5_t,<unnamed-symbol>>::operator ()(void)'
1> with
1> [
1> _Forced=true,
1> _Ret=void,
1> _Fun=std::_Pmf_wrap<void (__cdecl Consumer::* )(void),void,Consumer,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil>,
1> _V0_t=std::_Nil,
1> _V1_t=std::_Nil,
1> _V2_t=std::_Nil,
1> _V3_t=std::_Nil,
1> _V4_t=std::_Nil,
1> _V5_t=std::_Nil,
1> <unnamed-symbol>=std::_Nil
1> ]
1> C:Program Files (x86)Microsoft Visual Studio 11.0VCincludethr/xthread(195) : see reference to function template instantiation 'void std::_Bind<_Forced,_Ret,_Fun,_V0_t,_V1_t,_V2_t,_V3_t,_V4_t,_V5_t,<unnamed-symbol>>::operator ()(void)' being compiled
1> with
1> [
1> _Forced=true,
1> _Ret=void,
1> _Fun=std::_Pmf_wrap<void (__cdecl Consumer::* )(void),void,Consumer,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil>,
1> _V0_t=std::_Nil,
1> _V1_t=std::_Nil,
1> _V2_t=std::_Nil,
1> _V3_t=std::_Nil,
1> _V4_t=std::_Nil,
1> _V5_t=std::_Nil,
1> <unnamed-symbol>=std::_Nil
1> ]
1> C:Program Files (x86)Microsoft Visual Studio 11.0VCincludethread(52) : see reference to class template instantiation 'std::_Bind<_Forced,_Ret,_Fun,_V0_t,_V1_t,_V2_t,_V3_t,_V4_t,_V5_t,<unnamed-symbol>>' being compiled
1> with
1> [
1> _Forced=true,
1> _Ret=void,
1> _Fun=std::_Pmf_wrap<void (__cdecl Consumer::* )(void),void,Consumer,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil,std::_Nil>,
1> _V0_t=std::_Nil,
1> _V1_t=std::_Nil,
1> _V2_t=std::_Nil,
1> _V3_t=std::_Nil,
1> _V4_t=std::_Nil,
1> _V5_t=std::_Nil,
1> <unnamed-symbol>=std::_Nil
1> ]
1> Main.cpp(10) : see reference to function template instantiation 'std::thread::thread<void(__cdecl Consumer::* )(void)>(_Fn)' being compiled
1> with
1> [
1> _Fn=void (__cdecl Consumer::* )(void)
1> ]
Consumer::start
是一个非静态成员函数。这意味着它需要一个Consumer
实例才能对其执行操作。从形式上讲,这是通过为非静态成员函数提供隐式的第一个参数来完成的 this
。 std::thread
希望您传递一些可以用作第一个参数的参数的内容。
因此,您需要传递一个Consumer
实例或指向实例的指针,以便成员函数对其执行操作:
std::thread t3(&Consumer::start, c);