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[support.srcloc]
# 17 Language support library [[support]](./#support)
## 17.8 Source location [support.srcloc]
### [17.8.1](#source.location.syn) Header <source_location> synopsis [[source.location.syn]](source.location.syn)
[1](#source.location.syn-1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3619)
The header <source_location> defines
the class source_location that provides a means to obtain source location information[.](#source.location.syn-1.sentence-1)
// all freestandingnamespace std {struct source_location;}
### [17.8.2](#class) Class source_location [[support.srcloc.class]](support.srcloc.class)
#### [17.8.2.1](#class.general) General [[support.srcloc.class.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](#class.general-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"))[.](#class.general-1.sentence-1)
All of the following conditions are true:
- [(1.1)](#class.general-1.1)
is_nothrow_move_constructible_v<source_location>
- [(1.2)](#class.general-1.2)
is_nothrow_move_assignable_v<source_location>
- [(1.3)](#class.general-1.3)
is_nothrow_swappable_v<source_location>
[*Note [1](#class.general-note-1)*:
The intent of source_location is
to have a small size and efficient copying[.](#class.general-1.sentence-2)
It is unspecified
whether the copy/move constructors and the copy/move assignment operators
are trivial and/or constexpr[.](#class.general-1.sentence-3)
— *end note*]
[2](#class.general-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[.](#class.general-2.sentence-1)
[3](#class.general-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)](#class.general-3.1)
strcmp(lhs.file_name(), rhs_p.file_name()) == 0
- [(3.2)](#class.general-3.2)
strcmp(lhs.function_name(), rhs_p.function_name()) == 0
- [(3.3)](#class.general-3.3)
lhs.line() == rhs_p.line()
- [(3.4)](#class.general-3.4)
lhs.column() == rhs_p.column()
#### [17.8.2.2](#cons) Creation [[support.srcloc.cons]](support.srcloc.cons)
[🔗](#cons-itemdecl:1)
`static consteval source_location current() noexcept;
`
[1](#cons-1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3705)
*Returns*:
- [(1.1)](#cons-1.1)
When invoked by a function call
whose [*postfix-expression*](expr.post.general#nt:postfix-expression "7.6.1.1 General [expr.post.general]") is
a (possibly parenthesized) [*id-expression*](expr.prim.id.general#nt:id-expression "7.5.5.1 General [expr.prim.id.general]") naming current,
returns a source_location with an implementation-defined value[.](#cons-1.1.sentence-1)
The value should be affected by #line ([[cpp.line]](cpp.line "15.8 Line control"))
in the same manner as for __LINE__ and __FILE__[.](#cons-1.1.sentence-2)
The values of the exposition-only data members
of the returned source_location object
are indicated in Table [43](#tab:support.srcloc.current "Table 43: Value of object returned by current")[.](#cons-1.1.sentence-3)
Table [43](#tab:support.srcloc.current) — Value of object returned by current [[tab:support.srcloc.current]](./tab:support.srcloc.current)
| [🔗](#tab:support.srcloc.current-row-1)<br> **Element** | **Value** |
| --- | --- |
| [🔗](#tab:support.srcloc.current-row-2)<br> line_ | A presumed line number ([[cpp.predefined]](cpp.predefined "15.12 Predefined macro names"))[.](#tab:support.srcloc.current-row-2-column-2-sentence-1)<br>Line numbers are presumed to be 1-indexed; however, an implementation is encouraged to use 0 when the line number is unknown[.](#tab:support.srcloc.current-row-2-column-2-sentence-2) |
| [🔗](#tab:support.srcloc.current-row-3)<br> column_ | An implementation-defined value denoting some offset from the start of the line denoted by line_[.](#tab:support.srcloc.current-row-3-column-2-sentence-1)<br>Column numbers are presumed to be 1-indexed; however, an implementation is encouraged to use 0 when the column number is unknown[.](#tab:support.srcloc.current-row-3-column-2-sentence-2) |
| [🔗](#tab:support.srcloc.current-row-4)<br> file_name_ | A presumed name of the current source file ([[cpp.predefined]](cpp.predefined "15.12 Predefined macro names")) as an ntbs[.](#tab:support.srcloc.current-row-4-column-2-sentence-1) |
| [🔗](#tab:support.srcloc.current-row-5)<br> function_name_ | A name of the current function such as in __func__ ([[dcl.fct.def.general]](dcl.fct.def.general "9.6.1 General")) if any, an empty string otherwise[.](#tab:support.srcloc.current-row-5-column-2-sentence-1) |
- [(1.2)](#cons-1.2)
Otherwise, when invoked in some other way, returns a source_location whose data members are initialized
with valid but unspecified values[.](#cons-1.2.sentence-1)
[2](#cons-2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3748)
*Remarks*: Any call to current that appears
as a default member initializer ([[class.mem.general]](class.mem.general "11.4.1 General")), or
as a subexpression thereof,
should correspond to the location of
the constructor definition or aggregate initialization
that uses the default member initializer[.](#cons-2.sentence-1)
Any call to current that appears
as a default argument ([[dcl.fct.default]](dcl.fct.default "9.3.4.7 Default arguments")), or
as a subexpression thereof,
should correspond to the location of the invocation of the function
that uses the default argument ([[expr.call]](expr.call "7.6.1.3 Function call"))[.](#cons-2.sentence-2)
[3](#cons-3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3763)
[*Example [1](#cons-example-1)*: struct s { source_location member = source_location::current(); int other_member;
s(source_location loc = source_location::current()): member(loc) // values of member refer to the location of the calling function ([[dcl.fct.default]](dcl.fct.default "9.3.4.7 Default arguments")){} s(int blather) : // values of member refer to this location other_member(blather){} s(double) // values of member refer to this location{}};void f(source_location a = source_location::current()) { source_location b = source_location::current(); // values in b refer to this line}void g() { f(); // f's first argument corresponds to this line of code source_location c = source_location::current();
f(c); // f's first argument gets the same values as c, above} — *end example*]
[🔗](#cons-itemdecl:2)
`constexpr source_location() noexcept;
`
[4](#cons-4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3796)
*Effects*: The data members are initialized with valid but unspecified values[.](#cons-4.sentence-1)
#### [17.8.2.3](#obs) Observers [[support.srcloc.obs]](support.srcloc.obs)
[🔗](#obs-itemdecl:1)
`constexpr uint_least32_t line() const noexcept;
`
[1](#obs-1)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3807)
*Returns*: line_[.](#obs-1.sentence-1)
[🔗](#obs-itemdecl:2)
`constexpr uint_least32_t column() const noexcept;
`
[2](#obs-2)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3816)
*Returns*: column_[.](#obs-2.sentence-1)
[🔗](#obs-itemdecl:3)
`constexpr const char* file_name() const noexcept;
`
[3](#obs-3)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3825)
*Returns*: file_name_[.](#obs-3.sentence-1)
[🔗](#obs-itemdecl:4)
`constexpr const char* function_name() const noexcept;
`
[4](#obs-4)
[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/support.tex#L3834)
*Returns*: function_name_[.](#obs-4.sentence-1)