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1. • The presumed line number

     • The C++ standard simply has this to say: __LINE__: The presumed line number (within the current source file) of the current source line (an integer constant).
     stackoverflow.com/questions/5075928/what-is-the-type-of-the-line-macro-in-c

     What is the type of the __LINE__ macro in C++ - Stack Overflow

2. People also ask

   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 does the __LINE__ macro represent?

   • In C++, the __LINE__ macro represents the current line number in the source file. This integer value is used when generating log statements. See the following example to get the idea: >LOG("This is a dummy error");

   What are __FILE__, __LINE__, and __FUNCTION__ in C++

   www.tutorialspoint.com/what-are-file-line-and-function-in-cplusplus

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   What does __line__ mean?

   • The line number following the directive #line __LINE__ is unspecified (there are two possible values that __LINE__ can expand to in this case: number of endlines seen so far, or number of endlines seen so far plus the endline that ends the #line directive). This is the result of DR 464, which applies retroactively.

   Filename and line information - cppreference.com

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

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   How do you use __line__?

   • How do you guys use it? You can use __LINE__, along with __FILE__, to report where problems occur in the source code. Consider, for example, the assert() macro - this wording from the C99 standard, but C++ is similar, except it does not mention __func__:

   Why would you use the __LINE__ macro in C++ | Stack Overflow

   stackoverflow.com/questions/1719281/why-would-you-use-the-line-macro-in-c

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   What are FILE, LINE, and FUNCTION in C++?

   • In C++, __FILE__ is a macro used to get the path of the current file. This is useful when we want to generate log files. The other macros are: __LINE__, which provides the current line number, and __FUNCTION__, which provides the current function name.

   What are __FILE__, __LINE__, and __FUNCTION__ in C++

   www.tutorialspoint.com/what-are-file-line-and-function-in-cplusplus

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   What is __line__ in C?

   • Another use of __LINE__ (and possibly __FILE__) is to enable a macro to generate a unique identifier each time it's called. This implementation of coroutines in C uses these macros to generate labels for a case statement, so it can jump to the last line you called yield from. Just like this:

   Why would you use the __LINE__ macro in C++ | Stack Overflow

   stackoverflow.com/questions/1719281/why-would-you-use-the-line-macro-in-c

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3. stackoverflow.com › questions › 5075928What is the type of the __LINE__ macro in C++ - Stack Overflow

   stackoverflow.com › questions › 5075928

   Dec 18, 2022 · __LINE__: The presumed line number (within the current source file) of the current source line (an integer constant). It does not actually state the type so it's most likely going to be the same type as an unadorned integer would be in your source code which would be an int.

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

   stackoverflow.com › questions › 597078

   The others (__LINE__ and __FILE__) are just fine. It will always report the right file and line (and function if you choose to use __FUNCTION__ / __func__ ). Optimization is a non-factor since it is a compile time macro expansion; it will never affect performance in any way.

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

   www.cprogramming.com › reference › preprocessor

   • Cached

   __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.

6. www.tutorialspoint.com › what-are-file-line-andWhat are __FILE__, __LINE__, and __FUNCTION__ in C++

   www.tutorialspoint.com › what-are-file-line-and

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   Jul 30, 2019 · The __LINE__. This macro can find the current line number in source file. This line number is an integer value. When log statements are generating then __LINE__ plays some useful role. See the following example to get the idea.> Example

7. 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.

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

   en.cppreference.com › w › c

   • Cached

   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.

9. en.cppreference.com › w › cppFilename and line information - cppreference.com

   en.cppreference.com › w › cpp

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   Dec 1, 2022 · #line. [edit] Changes the source code's line number and, optionally, the current file name, in the preprocessor. Syntax. Explanation. 1) Changes the current preprocessor line number to lineno. Expansions of the macro __LINE__ beyond this point will expand to lineno plus the number of actual source code lines encountered since.