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有人可以幫我解決當我在下面創建主線程時出現的錯誤嗎?將函數傳遞給新線程時發生編譯器錯誤?
#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(其所有的頭,因爲最初打算使用模板):
#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();
}
}
我得到這個錯誤(相當可怕的前瞻性):
1>C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC\include\functional(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 11.0\VC\include\functional(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 11.0\VC\include\thr/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 11.0\VC\include\thread(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> ]
'reference_wrapper'沒有指定在這種情況下,除了工作,用'STD: :bind'。見[這個問題](http://stackoverflow.com/questions/21059115/c11-thread-class-how-to-use-a-class-member-function),和/或[LWG issue 2219](http: //cplusplus.github.io/LWG/lwg-active.html#2219)。 – Casey
對不起!我正在使用我寫的一箇舊例子,我認爲這個參數是針對函數調用的,而不是該類的實例:) – mezamorphic
@Casey我認爲它是。 – juanchopanza