#include <iostream>

void foo( const int i )
{
    std::cout << ( i + i ) << std::endl;
}

int bar( const double d )
{
    const int ret = static_cast< int >( d + 0.7 );
    std::cout << ( ret ) << std::endl;
    return ret;
}

template< class Ret,
          class Callable,
          class ...Args >
Ret callAnyProducer( Callable callable, Args&&... args )
{
    // auto start = current_time_point();
    Ret ret = callable( std::forward( args... ) );
    // auto duration = start - current_time_point()
    return ret;
}

int main()
{
    //getExecutionTime( foo, 1 );

    auto a = getExecutionTime( bar, 3.2 );
    return 0;
}

template< class Callable,
          class ...Args >
auto getExecutionTime( Callable callable, Args&&... args )
{
    //auto start = current_time_point();
    auto ret = callable( std::forward<Args...>( (args,...) ) );
    //auto duration = start - current_time_point()
    return ret;
}

int main()
{
    //auto a = getExecutionTime( foo, 1 );

    auto a = getExecutionTime( bar, 3.2 );
    return 0;
}