[英]error: no matching function for call to ‘std::thread::_Invoker<std::tuple
我正面临线程问题。
我试图在 Chronometer class 的线程内执行 function,包括一个 while 循环:
这是部分代码:
for(int i = 0; i<car_data.size();i++)
{
if(car_data[i]->checkArea(frame, pt1_zone, pt2_zone))
{
std::thread(&Chronometer::start_chrono, car_crono[i], std::ref(chrono));
cv::rectangle(frame, car_data[i]->pt1, car_data[i]->pt2, cv::Scalar(255,0,0), 1, cv::LINE_8,0);
//cv::putText(frame, "Parked", car_data[i]->pt1, cv::FONT_HERSHEY_DUPLEX, 0.9, cv::Scalar( 50, 255, 50 ));
//occupancy_state = place.occupancyTrue();
//place_1.occupancy = true;
car_crono 和 chrono 的类型
std::vector<Chronometer*> car_crono;
Chronometer chrono;
这是我的 class 计时器:
class Chronometer
{
private:
static int hour, min, sec;
//std::stringstream ss;
//Chronometer chrono;
public:
Chronometer();
static Chronometer& start_chrono(Chronometer& chrono);
static Chronometer& finish_chrono(Chronometer& chrono);
friend std::ostream& operator<<(std::ostream& flux, Chronometer t);
Chronometer& operator=(const Chronometer& other);
~Chronometer();
};
对于线程,我尝试了几种参数。 最后一个:
std::thread(&Chronometer::start_chrono, car_crono[i], std::ref(chrono));
我猜 ref 是必要的,但没有改变。
这是完整的错误
/usr/include/c++/7/thread: In instantiation of ‘struct std::thread::_Invoker<std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >’:
/usr/include/c++/7/thread:127:22: required from ‘std::thread::thread(_Callable&&, _Args&& ...) [with _Callable = Chronometer& (*)(Chronometer&); _Args = {Chronometer*&, std::reference_wrapper<Chronometer>}]’
recognizer_rtsp.cxx:348:76: required from here
/usr/include/c++/7/thread:240:2: error: no matching function for call to ‘std::thread::_Invoker<std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >::_M_invoke(std::thread::_Invoker<std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >::_Indices)’
operator()()
^~~~~~~~
/usr/include/c++/7/thread:231:4: note: candidate: template<long unsigned int ..._Ind> decltype (std::__invoke((_S_declval<_Ind>)()...)) std::thread::_Invoker<_Tuple>::_M_invoke(std::_Index_tuple<_Ind ...>) [with long unsigned int ..._Ind = {_Ind ...}; _Tuple = std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> >]
_M_invoke(_Index_tuple<_Ind...>)
^~~~~~~~~
/usr/include/c++/7/thread:231:4: note: template argument deduction/substitution failed:
/usr/include/c++/7/thread: In substitution of ‘template<long unsigned int ..._Ind> decltype (std::__invoke(_S_declval<_Ind>()...)) std::thread::_Invoker<std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >::_M_invoke<_Ind ...>(std::_Index_tuple<_Ind1 ...>) [with long unsigned int ..._Ind = {0, 1, 2}]’:
/usr/include/c++/7/thread:240:2: required from ‘struct std::thread::_Invoker<std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >’
/usr/include/c++/7/thread:127:22: required from ‘std::thread::thread(_Callable&&, _Args&& ...) [with _Callable = Chronometer& (*)(Chronometer&); _Args = {Chronometer*&, std::reference_wrapper<Chronometer>}]’
recognizer_rtsp.cxx:348:76: required from here
/usr/include/c++/7/thread:233:29: error: no matching function for call to ‘__invoke(std::__tuple_element_t<0, std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >, std::__tuple_element_t<1, std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >, std::__tuple_element_t<2, std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >)’
-> decltype(std::__invoke(_S_declval<_Ind>()...))
~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/tuple:41:0,
from /usr/include/c++/7/bits/stl_map.h:63,
from /usr/include/c++/7/map:61,
from ../alpr_utils.h:7,
from recognizer_rtsp.cxx:34:
/usr/include/c++/7/bits/invoke.h:89:5: note: candidate: template<class _Callable, class ... _Args> constexpr typename std::__invoke_result<_Functor, _ArgTypes>::type std::__invoke(_Callable&&, _Args&& ...)
__invoke(_Callable&& __fn, _Args&&... __args)
^~~~~~~~
/usr/include/c++/7/bits/invoke.h:89:5: note: template argument deduction/substitution failed:
/usr/include/c++/7/bits/invoke.h: In substitution of ‘template<class _Callable, class ... _Args> constexpr typename std::__invoke_result<_Functor, _ArgTypes>::type std::__invoke(_Callable&&, _Args&& ...) [with _Callable = Chronometer& (*)(Chronometer&); _Args = {Chronometer*, std::reference_wrapper<Chronometer>}]’:
/usr/include/c++/7/thread:233:29: required by substitution of ‘template<long unsigned int ..._Ind> decltype (std::__invoke(_S_declval<_Ind>()...)) std::thread::_Invoker<std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >::_M_invoke<_Ind ...>(std::_Index_tuple<_Ind1 ...>) [with long unsigned int ..._Ind = {0, 1, 2}]’
/usr/include/c++/7/thread:240:2: required from ‘struct std::thread::_Invoker<std::tuple<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> > >’
/usr/include/c++/7/thread:127:22: required from ‘std::thread::thread(_Callable&&, _Args&& ...) [with _Callable = Chronometer& (*)(Chronometer&); _Args = {Chronometer*&, std::reference_wrapper<Chronometer>}]’
recognizer_rtsp.cxx:348:76: required from here
/usr/include/c++/7/bits/invoke.h:89:5: error: no type named ‘type’ in ‘struct std::__invoke_result<Chronometer& (*)(Chronometer&), Chronometer*, std::reference_wrapper<Chronometer> >’
我应该通过线程传递什么样的参数?
我去了几个链接来寻找解决方案,但没有什么能解决我的问题:
没有匹配的 function 调用,使用 std::thread
...
Chronometer::start_chrono
是一个 static function,因此它不绑定到任何 object,即不需要调用 object。
Static成员函数不关联任何object,调用时没有this指针。
你应该简单地写。
std::thread(&Chronometer::start_chrono, std::ref(chrono));
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