eve::invocable_returning Concept Reference

Specifies that the function Op, when called with arguments of types Args..., returns a value convertible to R. More...

Detailed Description

Specifies that the function Op, when called with arguments of types Args..., returns a value convertible to R.

Template Parameters

Op	The function type
R	The expected return type
Args	The arguments types

Concept definition

  template<typename Op, typename R, typename... Args>
  concept invocable_returning = requires (Op op, Args&& ... args) {
    { op(std::forward<Args>(args)...) } -> std::convertible_to<R>;
  }