lang/capturepack.cpp

The following code example is taken from the book
C++20 - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2021
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

#include <iostream>
#include <string_view>

auto createToCall(auto op, auto... args)
{
  return [op, ...args = std::move(args)] () -> decltype(auto) {
           return op(args...);
         };
}

void printWithGAndNoG(std::string_view s)
{
  std::cout << s << "g " << s << '\n';
}

int main()
{
  auto printHero = createToCall(printWithGAndNoG, "Zhan");
  //...

  printHero();
}