poly/isnothrowmovable.hpp

The following code example is taken from the book
C++ Move Semantics - The Complete Guide by Nicolai M. Josuttis, Leanpub, 2020
The code is licensed under a Creative Commons Attribution 4.0 International License.

---

// raw code

// type trait to check whether a base class guarantees not to throw
// in the move constructor (even if the constructor is not callable)
#ifndef IS_NOTHROW_MOVABLE_HPP
#define IS_NOTHROW_MOVABLE_HPP

#include <type_traits>

template<typename Base>
struct Wrapper : Base {
  using Base::Base;
  // implement all possibly wrapped pure virtual functions:
  void print() const {}
  //...
};

template<typename T>
static constexpr inline bool is_nothrow_movable_v
  = std::is_nothrow_move_constructible_v<Wrapper<T>>;

#endif // IS_NOTHROW_MOVABLE_HPP