__FILE__
__FILE__ is a predefined C macro that expands to a string literal naming the current source file.
Modern C, Third Edition
__FILE__ is a predefined C macro that expands to a string literal naming the current source file.
- How it is used
- Supports debugging traces by identifying the source file associated with diagnostic output.
- How deep it goes
- Defines its string-literal expansion and debugging role, but does not develop its implementation mechanics.
- Examples
- Uses macro-based trace output that reports source location alongside debugging values.
- What you can do after
- Diagnose/debug with it by adding the originating source-file name to tracing or diagnostic output.
Modern C
__FILE__ is a predefined C macro that expands to a string literal containing the name of the current source file.
Related concepts
- macrokind of · A macro is a named construct that expands or transforms source code, commands, or templates before or during execution.
- opaque typekind of · An opaque type is a type whose representation and implementation details are hidden from code outside its defining abstraction boundary.
- threaduses · A thread is an independently schedulable sequence or context of execution within a program or process.
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