尝试在类构造函数中初始化 std::thread 时，函数中的编译器错误 C2064
Compiler error C2064 in functional when try to initialise a std::thread in a class constructor
我正在编写一个使用线程的类，我想尝试新的 C++11std::thread。 我正在使用Microsoft Visual Studio Pro 2013 v12.0.31101.00 Update 4进行编译。更新从 2014 年 11 月开始，因此是相当最新的。 我可以将std::thread用于简单用途，但在下面的代码中，我收到编译器错误。
如果我注释掉线程的初始化，如下所示：
serial(int port) : port_(port) {} //, reader_thread(&serial::reader_thread_func) {}
然后它编译正常。
我该如何解决这个问题？
这是我的代码。
串行.hpp：
/* serial port class */
#ifndef SERIAL_
#define SERIAL_
#include <thread>
class serial
{
public:
serial(int port) : port_(port), reader_thread(&serial::reader_thread_func) {}
~serial();
bool open();
bool close();
private:
std::thread reader_thread;
void reader_thread_func();
int port_;
};
#endif // SERIAL_
序列号.cpp：
#include <iostream>
#include "serial.hpp"
void serial::reader_thread_func() {
std::cout << "reader thread running with thread id: " << std::this_thread::get_id() << 'n';
}
serial::~serial() {
close();
}
bool serial::open() {
close(); // in case we are already open
std::cout << "opening port " << port_ << 'n';
return true;
}
bool serial::close() {
std::cout << "closing port " << port_ << 'n';
return false;
}
主要.cpp驱动：
#include "serial.hpp"
int main() {
serial s(3);
s.open();
s.close();
}
编译器错误：
1>------ Build started: Project: thread_in_class, Configuration: Debug Win32 ------
1> serial.cpp
1>c:program files (x86)microsoft visual studio 12.0vcincludefunctional(1149): 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 12.0vcincludefunctional(1137) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::_Do_call<,>(std::tuple<>,std::_Arg_idx<>)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludefunctional(1137) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::_Do_call<,>(std::tuple<>,std::_Arg_idx<>)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(195) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::operator ()<>(void)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(195) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::operator ()<>(void)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(192) : while compiling class template member function 'unsigned int std::_LaunchPad<_Target>::_Run(std::_LaunchPad<_Target> *)'
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(187) : see reference to function template instantiation 'unsigned int std::_LaunchPad<_Target>::_Run(std::_LaunchPad<_Target> *)' being compiled
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(205) : see reference to class template instantiation 'std::_LaunchPad<_Target>' being compiled
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:program files (x86)microsoft visual studio 12.0vcincludethread(49) : see reference to function template instantiation 'void std::_Launch<std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>>(_Thrd_t *,_Target &&)' being compiled
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:usersangusdocumentsvisual studio 2013projectsthread_in_classthread_in_classserial.hpp(10) : see reference to function template instantiation 'std::thread::thread<void(__thiscall serial::* )(void),>(_Fn &&)' being compiled
1> with
1> [
1> _Fn=void (__thiscall serial::* )(void)
1> ]
1> main.cpp
1>c:program files (x86)microsoft visual studio 12.0vcincludefunctional(1149): 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 12.0vcincludefunctional(1137) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::_Do_call<,>(std::tuple<>,std::_Arg_idx<>)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludefunctional(1137) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::_Do_call<,>(std::tuple<>,std::_Arg_idx<>)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(195) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::operator ()<>(void)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(195) : see reference to function template instantiation 'void std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>::operator ()<>(void)' being compiled
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(192) : while compiling class template member function 'unsigned int std::_LaunchPad<_Target>::_Run(std::_LaunchPad<_Target> *)'
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(187) : see reference to function template instantiation 'unsigned int std::_LaunchPad<_Target>::_Run(std::_LaunchPad<_Target> *)' being compiled
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:program files (x86)microsoft visual studio 12.0vcincludethrxthread(205) : see reference to class template instantiation 'std::_LaunchPad<_Target>' being compiled
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:program files (x86)microsoft visual studio 12.0vcincludethread(49) : see reference to function template instantiation 'void std::_Launch<std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>>(_Thrd_t *,_Target &&)' being compiled
1> with
1> [
1> _Target=std::_Bind<true,void,std::_Pmf_wrap<void (__thiscall serial::* )(void),void,serial,>,>
1> ]
1> c:usersangusdocumentsvisual studio 2013projectsthread_in_classthread_in_classserial.hpp(10) : see reference to function template instantiation 'std::thread::thread<void(__thiscall serial::* )(void),>(_Fn &&)' being compiled
1> with
1> [
1> _Fn=void (__thiscall serial::* )(void)
1> ]
1> Generating Code...
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
reader_thread_func是一个类成员函数。它不能作为独立函数调用，只能在类serial的实例上调用。您需要提供serial的实例作为第一个参数thread：
reader_thread = std::thread(&serial::reader_thread_func, this);
// ↑↑↑↑
这就是错误"术语不计算为采用 0 个参数的函数"的含义 - 在INVOKE的上下文中，reader_thread_func接受一个参数：serial。
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