cpp/utility/stacktrace entry/source file

Returns the presumed or actual name of the source file that lexically contains the expression or statement whose evaluation is represented by, or an empty string on failure other than allocation failure, e.g. when is empty.

Either returns the presumed source file name and  returns the presumed line number, or  returns the actual source file name and  returns the actual line number.

Parameters
(none)

Return value
The name of the source file specified above on success, an empty string on failure other than allocation failure.

Exceptions
Throws std if memory for the internal data structures or the resulting string cannot be allocated.