std::source_location::file_name

 

C++

Compiler support

Freestanding and hosted

Language

Standard library headers

Named requirements

Feature test macros (C++20)

Language support library

Concepts library (C++20)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (C++20)

Algorithms library

Numerics library

Localizations library

Input/output library

Filesystem library (C++17)

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Technical specifications

Symbols index

External libraries

 

Utilities library

Language support Type support (basic types, RTTI, type traits)      Library feature-test macros (C++20) Dynamic memory management Program utilities Error handling Coroutine support (C++20) Variadic functions is_constant_evaluated (C++20) launder (C++17) initializer_list (C++11) source_location (C++20) Three-way comparison (C++20) three_way_comparablethree_way_comparable_with (C++20)(C++20) strong_ordering (C++20) weak_ordering (C++20) partial_ordering (C++20) common_comparison_category (C++20) compare_three_way_result (C++20) compare_three_way (C++20) strong_order (C++20) weak_order (C++20) partial_order (C++20) compare_strong_order_fallback (C++20) compare_weak_order_fallback (C++20) compare_partial_order_fallback (C++20) is_eqis_neqis_ltis_lteqis_gtis_gteq (C++20)(C++20)(C++20)(C++20)(C++20)(C++20)

General utilities Date and time Function objects Formatting library (C++20) bitset hash (C++11) integer_sequence (C++14) Relational operators (deprecated in C++20) rel_ops::operator!=rel_ops::operator> rel_ops::operator<=rel_ops::operator>= Integer comparison functions cmp_equalcmp_lesscmp_less_than (C++20)(C++20)(C++20)    cmp_not_equalcmp_greatercmp_greater_than (C++20)(C++20)(C++20) in_range (C++20) Swap and type operations swap ranges::swap (C++20) exchange (C++14) declval (C++11) forward (C++11) move (C++11) move_if_noexcept (C++11) as_const (C++17) to_underlying (C++23) Common vocabulary types pair tuple (C++11) optional (C++17) any (C++17) variant (C++17) tuple_size (C++11) tuple_element (C++11) apply (C++17) make_from_tuple (C++17) Elementary string conversions to_chars (C++17) from_chars (C++17) chars_format (C++17)

 

std::source_location

Member functions

Creation

source_location::source_location

source_location::current

Field Access

source_location::line

source_location::column

source_location::file_name

source_location::function_name

 

constexpr const char* file_name() const noexcept;		(since C++20)

Returns the name of the current source file represented by this object, represented as a null-terminated byte string.

Parameters

(none)

Return value

The name of the current source file represented by this object, represented as a null-terminated byte string.

Example

Run this code

#if __has_include(<source_location>)
#include <source_location>
using std::source_location;
#elif __has_include(<experimental/source_location>)
#include <experimental/source_location>
using std::experimental::source_location;
#else
#error "<source_location> not found"
#endif
 
#include <iostream>
 
inline void print_this_file_name(
    const source_location& location = source_location::current())
{
    // Name of file that contains the call site of this function.
    std::cout << "File: " << location.file_name() << '\n';
}
 
auto main() -> int
{
    print_this_file_name();
}

Possible output:

File: main.cpp

See also

line	return the line number represented by this object (public member function)
column	return the column number represented by this object (public member function)
function_name	return the name of the function represented by this object, if any (public member function)
source_file (C++23)	gets the name of the source file that lexically contains the expression or statement whose evaluation is represented by the stacktrace_entry (public member function of std::stacktrace_entry)