lang/wrapper.hpp

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 <type_traits>  // for std::is_convertible_v<>

template<typename T>
class Wrapper {
    T value;
  public:
    template<typename U>
    explicit(!std::is_convertible_v<U, T>)
    Wrapper(const U& val)
     :value{val} {
    }
    //...
};