//********************************************************
// The following code example is taken from the book
//  C++17 - The Complete Guide
//  by Nicolai M. Josuttis (www.josuttis.com)
//  http://www.cppstd17.com
//
// The code is licensed under a
//  Creative Commons Attribution 4.0 International License
//  http://creativecommons.org/licenses/by/4.0/
//********************************************************


// "inherit" all function call operators of passed base types:
template<typename... Ts>
struct overload : Ts...
{
  using Ts::operator()...;
};

// base types are deduced from passed arguments:
template<typename... Ts>
overload(Ts...) -> overload<Ts...>;