std::convertible_to(3) Library Functions Manual std::convertible_to(3)

std::convertible_to - [concept.convertible], concept convertible_to

#include <concepts>

template<typename _From, typename _To>
concept std::convertible_to =  is_convertible_v<_From, _To>
      && requires { static_cast<_To>(std::declval<_From>()); }

[concept.convertible], concept convertible_to

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