#include <functional>
#include <iostream>
#include <memory>

struct Toto
{
    void foo( int param )
    {
        std::cout << "foo: " << param << std::endl;
    }
};

int main() {
    std::shared_ptr<Toto> ptr = std::make_shared<Toto>();
    std::function< void(int) > func( std::bind( &Toto::foo,
        std::bind( [ptr] () { return ptr.get(); } ),
        std::placeholders::_1
    ) );
    
    func( 1 );
}