cpp/utility/stacktrace entry/source line

Returns a 1-based line number that lexically relates to the evaluation represented by, or 0 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 line number specified above on success, 0 on failure other than allocation failure.

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