/*
VIM: let b:cf5build="clang -std=c++20 -O2 -pthread -lstdc++ -I. {SRC} -o {OUT}"
VIM: let b:cf5run="{OUT}"
VIM-: let b:cppflags=g:Iboost.g:Itbb
VIM-: let b:ldflags=g:Lboost.g:Ltbb
VIM-: let b:ldlibpath=g:Bboost.g:Btbb
*/
#include <iostream>
#include <exception>
#include <chrono>

namespace ttt {
 struct s {
 };
 void print( const s& t ){
     std::cout << "ttt::print" << std::endl;
 }
}

namespace C
{
    template <typename T>
    void print( T t ){
        std::cout << "C::print" << std::endl;
    }

    template <typename T>
    void call_print( const T& t ){
        print( t );
    }
};


int main ( void )
{try{
    auto begin = std::chrono::high_resolution_clock::now();


    //......
    C::call_print(ttt::s{});

    auto end = std::chrono::high_resolution_clock::now();
    std::chrono::duration<double> seconds = end - begin;
    std::cout << "Time: " << seconds.count() << std::endl;
    return 0;
}
catch ( const std::exception& e )
{
    std::cerr << std::endl
            << "std::exception(\"" << e.what() << "\")." << std::endl;
    return 2;
}
catch ( ... )
{
    std::cerr  << std::endl
            << "unknown exception." << std::endl;
    return 1;
}}