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std::experi...ce_location(3)  C++ Standard Libary std::experi...ce_location(3)

NAME
       std::experimental::source_location - std::experimental::source_location

Synopsis
	  Defined in header <experimental/source_location>
	  struct source_location;			    (library fundamen-
       tals TS v2)

	  The  source_location	class represents certain information about the
       source code, such
	  as file names, line numbers, and function names.  Previously,	 func-
       tions that desire
	  to  obtain  this information about the call site (for	logging, test-
       ing, or debugging
	  purposes) must use macros so that predefined	macros	like  __LINE__
       and __FILE__ are
	  expanded  in	the  context  of the caller. The source_location class
       provides	a better
	  alternative.

Member functions
		Creation
				constructs a new source_location  with	imple-
       mentation-defined
	  constructor		values
				(public	member function)
	  current		constructs a new source_location
	  [static]		(public	static member function)
		Other special member functions
	  destructor		destructs a source_location
	  (implicitly declared)	(public	member function)
	  operator=		Implicitly declared copy/move assignment oper-
       ators
	  (implicitly declared)	(public	member function)
		Field access
	  line			return the line	number represented by this ob-
       ject
				(public	member function)
	  column		 return	 the column number represented by this
       object
				(public	member function)
	  file_name		return the file	name represented by  this  ob-
       ject
				(public	member function)
				return the name	of the function	represented by
       this object, if
	  function_name		any
				(public	member function)

Example
       // Run this code

	#include <iostream>
	#include <string_view>
	#include <experimental/source_location>

	void   log(const   std::string_view&  message,	const  std::experimen-
       tal::source_location&   location	  =    std::experimental::source_loca-
       tion::current())
	{
	    std::cout << "info:"
		      << location.file_name() << ":"
		      << location.line() << " "
		      << message << '\n';
	}

	int main()
	{
	    log("Hello world!");
	}

Possible output:
	info:main.cpp:15 Hello world!

http://cppreference.com		  2022.07.31	  std::experi...ce_location(3)

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