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std::convertible_to(3) C++ Standard Libary std::convertible_to(3) NAME std::convertible_to - std::convertible_to Synopsis Defined in header <concepts> template< class From, class To > concept convertible_to = std::is_convertible_v<From, To> && (since C++20) requires { static_cast<To>(std::declval<From>()); }; The concept convertible_to<From, To> specifies that an expression of the same type and value category as those of std::declval<From>() can be implic- itly and explicitly converted to the type To, and the two forms of conversion produce equal results. Semantic requirements convertible_to<From, To> is modeled only if, given a function fun of type std::add_rvalue_reference_t<From>() such that the expression fun() is equality-preserving, * Either * To is neither an object type nor a reference-to-object type, or * static_cast<To>(fun()) is equal to []() -> To { return fun(); }(), and * One of the following is true: * std::add_rvalue_reference_t<From> is not a reference-to-ob- ject type, or * std::add_rvalue_reference_t<From> is an rvalue reference to a non-const-qualified type, and the resulting state of the object referenced by fun() is valid but unspecified after either expression above; or * the object referred to by fun() is not modified by either expression above. Equality preservation Expressions declared in requires expressions of the standard library concepts are required to be equality-preserving (except where stated otherwise). See also is_convertible is_nothrow_convertible checks if a type can be converted to the other type (C++11) (class template) (C++20) http://cppreference.com 2024.06.10 std::convertible_to(3)
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