call wrapper and binder, C++ (vc++)

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//Microsoft (R) C/C++ Optimizing Compiler Version 19.00.23506 for x64

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

struct A { void do_some_thing() const { std::cout << "A::do_something\n" ; } };

struct B
{
    int do_some_thing_else( int v )
    {
        std::cout << "B::do_something_else(" << v << ")\n" ;
        return i += v ;
    }
    int i = 0 ;
};

void do_a_third_thing( int v ) { std::cout << "::do_a_third_thing(" << v << ")\n" ; }

struct to_do_list
{
    // https://en.cppreference.com/w/cpp/utility/functional/bind
    template < typename FN, typename... ARGS > void add( FN fn, ARGS&&... args )
    { things_to_be_done.emplace_back( std::bind( fn, std::forward<ARGS>(args)... ) ) ; }

void do_them_now()
    {
        int cnt = 0 ;
        for( const auto& fn : things_to_be_done ) { std::cout << ++cnt << ". " ; fn() ; }
        things_to_be_done.clear() ;
    }

// https://en.cppreference.com/w/cpp/utility/functional/function
    std::vector< std::function< void() > > things_to_be_done ;
};

int main ()
{
    A a ;
    B b ;

to_do_list list ;
    list.add( &A::do_some_thing, std::ref(a) ) ;
    list.add( &B::do_some_thing_else, std::ref(b), 23 ) ;
    list.add( &do_a_third_thing, 999 ) ;
    list.add( [] { std::cout << "closure: do this too\n" ; } ) ;

list.do_them_now() ;
}

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Compilation time: 2,09 sec, absolute running time: 0,21 sec, absolute service time: 2,32 sec