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]

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namespace std { struct source_location { // source location construction static consteval source_location current() noexcept; constexpr source_location() noexcept; // source location field access 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_; // exposition only uint_least32_t column_; // exposition only const char* file_name_; // exposition only const char* function_name_; // exposition only }; }
1
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The type source_location meets the Cpp17DefaultConstructible, Cpp17CopyConstructible, Cpp17CopyAssignable, Cpp17Swappable, and Cpp17Destructible requirements ([utility.arg.requirements], [swappable.requirements]).
All of the following conditions are true:
  • (1.1)
    is_nothrow_move_constructible_v<source_location>
  • (1.2)
    is_nothrow_move_assignable_v<source_location>
  • (1.3)
    is_nothrow_swappable_v<source_location>
[Note 1: 
The intent of source_location is to have a small size and efficient copying