Question

Is it possible to create an std::vector that can hold an std::function with any signature?
(The function arguments would all be pre-bound.)

I tried std::vector<std::function<void()> >, since if I only have one std::function of that type I can bind any function to it.

This does not seem to work inside a vector: if I try to add a function with std::bind to the vector that has a signature other than void(), I get:

No matching member function for call to 'push_back'

Is there a way to do this?

Edit:

I just remembered that std::function<void()> does allow you to bind any function that returns void as long as the arguments are pre-bound with std::bind, it does not allow you to bind any signature though, but for my purposes it’s generic enough, so the following works:

class A
{
public:
    void test(int _a){ return 0; };
};

A a;
std::vector<std::function<void()> > funcArray;
funcArray.push_back(std::bind(&A::test, std::ref(a), 0));

Answer 1

This should work:

#include <iostream>
#include <functional>
#include <vector>

void hello() { std::cout << "Hello\n"; }
void hello2(const char * name) { std::cout << "Hello " << name << '\n'; }

int main()
{

    std::vector<std::function<void()>> v;
    v.push_back(hello);
    v.push_back(std::bind(hello2, "tim"));
    v[0]();
    v[1]();
}

How are you doing it?