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1. stackoverflow.com › questions › 597078__FILE__, __LINE__, and __FUNCTION__ usage in C++

   stackoverflow.com › questions › 597078

   Presuming that your C++ compiler supports them, is there any particular reason not to use __FILE__, __LINE__ and __FUNCTION__ for logging and debugging purposes?

2. www.cprogramming.com › reference › preprocessor__LINE__ - C and C++ Syntax Reference - Cprogramming.com

   www.cprogramming.com › reference › preprocessor

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   __LINE__ is a preprocessor macro that expands to current line number in the source file, as an integer. __LINE__ is useful when generating log statements, error messages intended for programmers, when throwing exceptions , or when writing debugging code.

3. gcc.gnu.org › onlinedocs › cppStandard Predefined Macros (The C Preprocessor)

   gcc.gnu.org › onlinedocs › cpp

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   __LINE__ This macro expands to the current input line number, in the form of a decimal integer constant. While we call it a predefined macro, it’s a pretty strange macro, since its “definition” changes with each new line of source code.

4. en.cppreference.com › w › cFilename and line information - cppreference.com

   en.cppreference.com › w › c

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   May 27, 2022 · 1) Changes the current preprocessor line number to lineno. Occurrences of the macro __LINE__ beyond this point will expand to lineno plus the number of actual source code lines encountered since. 2) Also changes the current preprocessor file name to filename.

5. learn.microsoft.com › en-us › cppPredefined macros | Microsoft Learn

   learn.microsoft.com › en-us › cpp

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   __LINE__ Defined as the integer line number in the current source file. The value of this macro can be changed by using a #line directive. The integral type of the value of __LINE__ can vary depending on context.

6. www.geeksforgeeks.org › predefined-macros-in-cPredefined Macros in C with Examples - GeeksforGeeks

   www.geeksforgeeks.org › predefined-macros-in-c

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   Dec 21, 2021 · __LINE__ Macro: __LINE__ macro contains the current line number of the program in the compilation. It gives the line number where it is called. It is used in generating log statements, error messages, throwing exceptions and debugging codes.

7. People also ask

   What is __line__ in C?

   • Use __LINE__, but what is its type? LINE The presumed line number (within the current source file) of the current source line (an integer constant). As an integer constant, code can often assume the value is __LINE__ <= INT_MAX and so the type is int. To print in C, printf() needs the matching specifier: "%d".

   C/C++ line number | Stack Overflow

   stackoverflow.com/questions/2849832/c-c-line-number

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   What are __line__ macros in C++?

   • As part of the C++ standard there exists some pre-defined macros that you can use. Section 16.8 of the C++ standard defines amongst other things, the __LINE__ macro. __LINE__: The line number of the current source line (a decimal constant). __FILE__: The presumed name of the source file (a character string literal).

   C/C++ line number | Stack Overflow

   stackoverflow.com/questions/2849832/c-c-line-number

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   What does __line__ do?

   • 1) Changes the current preprocessor line number to lineno. Occurrences of the macro __LINE__ beyond this point will expand to lineno plus the number of actual source code lines encountered since. 2) Also changes the current preprocessor file name to filename. Occurrences of the macro __FILE__ beyond this point will produce filename.

   Filename and line information - cppreference.com

   en.cppreference.com/w/c/preprocessor/line

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   What is __line__ macro?

   • The __LINE__ macro is often combined with the __FILE__ macro, which expands to the current file name.

   __LINE__ - C and C++ Syntax Reference - Cprogramming.com

   www.cprogramming.com/reference/preprocessor/__LINE__.html

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   What is a line directive in C?

   • This directive is used by some automatic code generation tools which produce C source files from a file written in another language. In that case, #line directives may be inserted in the generated C file referencing line numbers and the file name of the original (human-editable) source file.

   Filename and line information - cppreference.com

   en.cppreference.com/w/c/preprocessor/line

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   Why do preprocessors use 'line' in C++?

   • Messing with #line is very useful for pre-processors that want to keep errors reported in the user's C code in line with the user's source file. Yacc, Lex, and (more at home to me) ESQL/C preprocessors do that. C++20 std::source_location

   __FILE__, __LINE__, and __FUNCTION__ usage in C++

   stackoverflow.com/questions/597078/file-line-and-function-usage-in-c

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8. learn.microsoft.com › en-us › cpp#line directive (C/C++) | Microsoft Learn

   learn.microsoft.com › en-us › cpp

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   Mar 13, 2022 · The #line directive sets the value for the line that immediately follows the directive in the source file. The translator uses the line number and filename to determine the values of the predefined macros __FILE__ and __LINE__.