私は現在 C++ を学習しようとしていますが、理解できないコンパイラ エラーが 1 つあります。誰かがコンパイラエラーの意味を説明してもらえますか?
1 #include <thread>
2 #include <vector>
3 #include <iostream>
4
5 namespace thread_pool {
6
7 class worker {
8 public:
9 worker();
10 private:
11 };
12
13 worker::worker() { std::cout << "hello from worker\n"; }
14
15 class pool_keeper {
16 public:
17 pool_keeper(int);
18 private:
19 std::vector< std::thread > workers_;
20 int pool_size_;
21 };
22
23 pool_keeper::pool_keeper(int pool_size) {
24 int i;
25 pool_size_ = pool_size;
26 for (i=0; i<pool_size_; i++)
27 workers_.push_back(std::thread(worker()));
28 }
29 }
コンパイラは私にこれを与えます:
In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4/thread:39:0,
from 01.cpp:1:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4/functional: In member function ‘void std::_Bind_result<_Result, _Functor(_Bound_args ...)>::__call(std::tuple<_Args ...>&&, std::_Index_tuple<_Indexes ...>, typename std::_Bind_result<_Result, _Functor(_Bound_args ...)>::__enable_if_void<_Res>::type) [with _Res = void, _Args = {}, int ..._Indexes = {}, _Result = void, _Functor = thread_pool::worker, _Bound_args = {}, typename std::_Bind_result<_Result, _Functor(_Bound_args ...)>::__enable_if_void<_Res>::type = int]’:
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4/functional:1378:24: instantiated from ‘std::_Bind_result<_Result, _Functor(_Bound_args ...)>::result_type std::_Bind_result<_Result, _Functor(_Bound_args ...)>::operator()(_Args&& ...) [with _Args = {}, _Result = void, _Functor = thread_pool::worker, _Bound_args = {}, std::_Bind_result<_Result, _Functor(_Bound_args ...)>::result_type = void]’
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4/thread:117:13: instantiated from ‘void std::thread::_Impl<_Callable>::_M_run() [with _Callable = std::_Bind_result<void, thread_pool::worker()>]’
01.cpp:29:1: instantiated from here
/usr/lib/gcc/x86_64-pc-linux-gnu/4.6.3/include/g++-v4/functional:1287:4: error: no match for call to ‘(thread_pool::worker) ()’
std::thread のコードを調べて、コンパイラ エラーの意味を理解しようとしていましたが、解決策を見つけるためのより良い方法があると思います。