17 Language support library [support]

17.8 Source location [support.srcloc]

17.8.2 Class source_location [support.srcloc.class]

17.8.2.2 Creation [support.srcloc.cons]

Table 43 — Value of object returned by current [tab:support.srcloc.current]
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Element
Value
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line_
A presumed line number ([cpp.predefined]).
Line numbers are presumed to be 1-indexed; however, an implementation is encouraged to use 0 when the line number is unknown.
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column_
An implementation-defined value denoting some offset from the start of the line denoted by line_.
Column numbers are presumed to be 1-indexed; however, an implementation is encouraged to use 0 when the column number is unknown.
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file_name_
A presumed name of the current source file ([cpp.predefined]) as an ntbs.
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function_name_
A name of the current function such as in __func__ ([dcl.fct.def.general]) if any, an empty string otherwise.