std::bind创建的函子在哪里?

函数指针可以指向任何对象,包括自由函数、函数对象、成员函数调用的包装器。

但是,std::bind创建的函子可以具有状态,也可以具有自定义创建的状态。该状态被分配到哪里,谁在删除它?

考虑以下示例-删除向量时,状态(数字10)是否会被删除?谁知道在函子上调用删除器,而在函数指针上不调用删除器?

#include <iostream>
#include <functional>
#include <vector>
using namespace std;
using namespace std::placeholders;
class Bar
{
    public:
    void bar(int x, int y) { cout << "bar" << endl; }
};
void foo(int baz){ cout << "foo" << endl; }
int main() {
    typedef std::function<void(int)> Func;

    std::vector<Func> funcs;
    funcs.push_back(&foo); // foo does not have to be deleted
    Bar b;
    // the on-the-fly functor created by bind has to be deleted
    funcs.push_back(std::bind(&Bar::bar, &b, 10, _1)); 

    // bind creates a copy of 10. 
    // That copy does not go into the vector, because it's a vector of pointers.
    // Where does it reside? Who deletes it after funcs is destroyed?

    return 0;
}