3.4 KiB
[support.srcloc.class.general]
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 {// source location constructionstatic consteval source_location current() noexcept; constexpr source_location() noexcept; // source location field accessconstexpr 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_; // exposition only uint_least32_t column_; // exposition onlyconst char* file_name_; // exposition onlyconst char* function_name_; // exposition only};}
The type source_location meets theCpp17DefaultConstructible,Cpp17CopyConstructible,Cpp17CopyAssignable,Cpp17Swappable, andCpp17Destructible requirements ([utility.arg.requirements], [swappable.requirements]).
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.
â 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 rhs before 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()