[support.srcloc.class.general] (original) (raw)

17 Language support library [support]

17.8 Source location [support.srcloc]

17.8.2 Class source_location [support.srcloc.class]

17.8.2.1 General [support.srcloc.class.general]

namespace std { struct source_location { static consteval source_location current() noexcept;constexpr source_location() noexcept;constexpr uint_least32_t line() const noexcept;constexpr uint_least32_t column() const noexcept;constexpr const char* file_name() const noexcept;constexpr const char* function_name() const noexcept;private: uint_least32_t line_; uint_least32_t column_; const char* file_name_; const char* function_name_; };}

All of the following conditions are true:

• is_nothrow_move_constructible_v<source_location>
• is_nothrow_move_assignable_v<source_location>
• is_nothrow_swappable_v<source_location>

[Note 1:

The intent of source_location is to have a small size and efficient copying.

It is unspecified whether the copy/move constructors and the copy/move assignment operators are trivial and/or constexpr.

— _end note_]

The data members file_name_ and function_name_always each refer to an ntbs.

The copy/move constructors and the copy/move assignment operators ofsource_location meet the following postconditions: Given two objects lhs and rhs of type source_location, where lhs is a copy/move result of rhs, and where rhs_p is a value denoting the state of rhsbefore the corresponding copy/move operation, then each of the following conditions is true:

• strcmp(lhs.file_name(), rhs_p.file_name()) == 0
• strcmp(lhs.function_name(), rhs_p.function_name()) == 0
• lhs.line() == rhs_p.line()
• lhs.column() == rhs_p.column()