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cppdraft/support/srcloc/class/general.md

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+[support.srcloc.class.general]
+
+# 17 Language support library [[support]](./#support)
+
+## 17.8 Source location [[support.srcloc]](support.srcloc#class.general)
+
+### 17.8.2 Class source_location [[support.srcloc.class]](support.srcloc.class#general)
+
+#### 17.8.2.1 General [support.srcloc.class.general]
+
+[🔗](#lib:source_location)
+
+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 only*const char* file_name_; // *exposition only*const char* function_name_; // *exposition only*};}
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3658)
+
+The type source_location meets the[*Cpp17DefaultConstructible*](utility.arg.requirements#:Cpp17DefaultConstructible "16.4.4.2 Template argument requirements [utility.arg.requirements]"),[*Cpp17CopyConstructible*](utility.arg.requirements#:Cpp17CopyConstructible "16.4.4.2 Template argument requirements [utility.arg.requirements]"),[*Cpp17CopyAssignable*](utility.arg.requirements#:Cpp17CopyAssignable "16.4.4.2 Template argument requirements [utility.arg.requirements]"),[*Cpp17Swappable*](swappable.requirements#:Cpp17Swappable "16.4.4.3 Swappable requirements [swappable.requirements]"), and[*Cpp17Destructible*](utility.arg.requirements#:Cpp17Destructible "16.4.4.2 Template argument requirements [utility.arg.requirements]") requirements ([[utility.arg.requirements]](utility.arg.requirements "16.4.4.2 Template argument requirements"), [[swappable.requirements]](swappable.requirements "16.4.4.3 Swappable requirements"))[.](#1.sentence-1)
+
+All of the following conditions are true:
+
+- [(1.1)](#1.1)
+
+is_nothrow_move_constructible_v<source_location>
+
+- [(1.2)](#1.2)
+
+is_nothrow_move_assignable_v<source_location>
+
+- [(1.3)](#1.3)
+
+is_nothrow_swappable_v<source_location>
+
+[*Note [1](#note-1)*:
+
+The intent of source_location is
+to have a small size and efficient copying[.](#1.sentence-2)
+
+It is unspecified
+whether the copy/move constructors and the copy/move assignment operators
+are trivial and/or constexpr[.](#1.sentence-3)
+
+— *end note*]
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3680)
+
+The data members file_name_ and function_name_ always each refer to an ntbs[.](#2.sentence-1)
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3684)
+
+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:
+
+- [(3.1)](#3.1)
+
+strcmp(lhs.file_name(), rhs_p.file_name()) == 0
+
+- [(3.2)](#3.2)
+
+strcmp(lhs.function_name(), rhs_p.function_name()) == 0
+
+- [(3.3)](#3.3)
+
+lhs.line() == rhs_p.line()
+
+- [(3.4)](#3.4)
+
+lhs.column() == rhs_p.column()