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Question

Alleksh _

Asked:2020-11-28 05:42:23 +0000 UTC2020-11-28 05:42:23 +0000 UTC 2020-11-28 05:42:23 +0000 UTC

不想初始化线程

772

每个参数都是绝对正确的，但是由于某种原因在 std::invoke 中抛出了异常。
代码：
调用函数：

void AutoSendFunc(
bool& CloseThreads,
char* Request,
int delay,
void(*ProcessFunc)(request),
void(*sendRequest)(char*&, char*))
{
    while (!CloseThreads)
    {
        char* ptr;
        sendRequest(ptr, Request);
        ProcessFunc(request(std::string(ptr)));
        std::this_thread::sleep_for(std::chrono::milliseconds(delay));
        delete ptr;
    }
}

尝试调用线程：

void sendRequest(char*& recvdest, char*send)
{

}
...
std::vector<std::pair<
    std::pair
        <std::string,
        int>,
    void(*)(request)>> Requests;
...
#define Request Requests[i].first.first
        char* request = new char[Request.size()+1];
        memcpy(request, Request.c_str(), Request.size());
        request[Request.size()] = 0;
#undef Request
    std::thread thread
    (
        AutoSendFunc,
        CloseThreads,
        request,
        Requests[i].first.second,
        Requests[i].second,
        &sendRequest
    );

结论：

1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(238): error C2672: "std::invoke": не найдена соответствующая перегруженная функция
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(246): note: выполняется компиляция ссылки на экземпляр шаблон функции "void std::_LaunchPad<_Target>::_Execute<0,1,2,3,4,5>(std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)> &,std::integer_sequence<_Ty,0,1,2,3,4,5>)"
1>        with
1>        [
1>            _Target=std::unique_ptr<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>,std::default_delete<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>>>,
1>            _Ty=size_t
1>        ]
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(245): note: выполняется компиляция ссылки на экземпляр шаблон функции "void std::_LaunchPad<_Target>::_Execute<0,1,2,3,4,5>(std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)> &,std::integer_sequence<_Ty,0,1,2,3,4,5>)"
1>        with
1>        [
1>            _Target=std::unique_ptr<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>,std::default_delete<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>>>,
1>            _Ty=size_t
1>        ]
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(242): note: при компиляции функции-члена "<Нет данных>" класса класс <Нет данных>
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(230): note: выполняется компиляция ссылки на экземпляр шаблон функции "void std::_LaunchPad<_Target>::_Run(std::_LaunchPad<_Target> *) noexcept"
1>        with
1>        [
1>            _Target=std::unique_ptr<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>,std::default_delete<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>>>
1>        ]
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(257): note: выполняется компиляция ссылки на экземпляр шаблон класс "std::_LaunchPad<_Target>"
1>        with
1>        [
1>            _Target=std::unique_ptr<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>,std::default_delete<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>>>
1>        ]
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thread(46): note: выполняется компиляция ссылки на экземпляр шаблон функции "void std::_Launch<std::unique_ptr<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>,std::default_delete<_Ty>>>(_Thrd_t *,_Target &&)"
1>        with
1>        [
1>            _Ty=std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>,
1>            _Target=std::unique_ptr<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>,std::default_delete<std::tuple<void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)>>>
1>        ]
1>c:\users\alleksh\source\repos\netlib\netlib\netlib.h(152): note: выполняется компиляция ссылки на экземпляр шаблон функции "std::thread::thread<void(__cdecl &)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *)),bool&,char*&,_Ty2&,void(__cdecl *&)(request),void(__cdecl *)(char *&,char *),void>(_Fn,bool &,char *&,_Ty2 &,void (__cdecl *&)(request),void (__cdecl *&&)(char *&,char *))"
1>        with
1>        [
1>            _Ty2=int,
1>            _Fn=void (__cdecl &)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *))
1>        ]
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(237): error C2893: Сбой при специализации функции-шаблона "unknown-type std::invoke(_Callable &&,_Types &&...) noexcept(<expr>)"
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(237): note: Со следующими аргументами шаблона:
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(237): note: "_Callable=void (__cdecl *)(bool &,char *,int,void (__cdecl *)(request),void (__cdecl *)(char *&,char *))"
1>d:\mvs\ide\vc\tools\msvc\14.14.26428\include\thr\xthread(237): note: "_Types={bool, char *, int, void (__cdecl *)(request), void (__cdecl *)(char *&,char *)}"

1 个回答

Voted

AnT stands with Russia · Answer 1 · 2020-11-28T06:47:30Z

Best Answer

AnT stands with Russia

2020-11-28T06:47:30Z2020-11-28T06:47:30Z

该错误正是由错误地将参数传输到流引起的CloseThreads。如果你想为“reference”类型的参数传递一个参数，那么你应该准确地传递std::ref

std::thread thread
(
    AutoSendFunc,
    std::ref(CloseThreads),
    request,
    Requests[i].first.second,
    Requests[i].second,
    &sendRequest
);

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