为什么动态创建线程向量是错误的?我收到编译错误
C:\Program Files (x86)\Microsoft Visual Studio 12.0\VC\include\xmemory0(593): 错误 C2280: 'std::thread::thread(const std::thread &)' : 尝试引用已删除的函数
其次是许多其他东西。
#include <iostream>
#include <thread>
#include <vector>
using std::vector;
using std::thread;
using std::cout;
class obj_on_thread {
public:
void operator()()
{
std::cout << "obj on threadn";
}
};
void function_on_thread() {
std::cout << "function on threadn";
}
auto named_lambda = []() { std::cout << "named_lambda_on_threadn"; };
int main(){
obj_on_thread obj;
vector<thread> pool {
thread{ obj },
thread{ function_on_thread },
thread{ named_lambda },
thread{ []() { cout << "anonymous lambda on threadn"; } }
};
cout << "main threadn";
for(auto& t : pool)
{
if (t.joinable())
{
cout << "Joinable = true";
t.join(); //if called must be called once.
}
else
{
cout << "this shouldn't get printed, joinable = falsen";
}
}
for (auto& t : pool)
{
if (t.joinable())
{
cout << " This won't be printed Joinable = true";
}
else
{
cout << "joinable = false thread are already jointn";
}
}
return 0;
}
std::vector
的构造函数使用 initializer_list
要求元素是可复制构造的,因为initializer_list
本身需要这样做(其底层"存储"作为复制构造的临时数组实现)。 std::thread
不可复制构造(此构造函数已删除)。
http://en.cppreference.com/w/cpp/utility/initializer_list
底层数组是一个临时数组,其中每个元素都是 复制初始化...
没有解决这个问题的好方法 - 你不能一次初始化所有线程,但你可以使用(多个调用,每个线程一个 - 不幸的是):
-
emplace_back()
:pool.emplace_back(obj);
-
push_back()
右值:pool.push_back(thread{obj});
-
push_back()
带有显式move()
s:auto t = thread{obj}; pool.push_back(std::move(t));