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std::expected::value_or(3) C++ Standard Libary std::expected::value_or(3) NAME std::expected::value_or - std::expected::value_or Synopsis template< class U > (1) (since C++23) constexpr T value_or( U&& default_value ) const&; template< class U > (2) (since C++23) constexpr T value_or( U&& default_value ) &&; Returns the contained value if *this contains an expected value, otherwise returns default_value. 1) Returns bool(*this) ? **this : static_cast<T>(std::forward<U>(de- fault_value)) 2) Returns bool(*this) ? std::move(**this) : static_cast<T>(std::forward<U>(default_value)) Parameters default_value - the value to use in case *this does not contain an expected value Type requirements - T must meet the requirements of CopyConstructible in order to use overload (1). - T must meet the requirements of MoveConstructible in order to use overload (2). - U&& must be convertible to T Return value The currently contained value if *this contains an expected value, or default_value otherwise. Exceptions Any exception thrown by the selected constructor of the return value T. Notes If T is (possibly cv-qualified) void, this member is not declared. Example This section is incomplete Reason: no example See also value returns the expected value (public member function) Category: * Todo no example http://cppreference.com 2024.06.10 std::expected::value_or(3)
NAME | Synopsis | Parameters | Type requirements | Return value | Exceptions | Notes | Example | See also | Category:
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