#line directive — Changes the line number in error messages
#linedigits
#linedigits
string
The #line
directive changes
the compiler's notion of the current filename and line number. The
first form changes the line number (as expressed by the _ _LINE_ _
directive and used in error
messages) to digits
. The second form
changes the line number to digits
and the
filename to the contents of string
. The new
file name is used as the value of the _
_FILE_ _
macro.
The #line
directive is
typically used by programs that generate C++ as output from some other
input. The directive records the original filename and line number
that produced the C++ code. Error messages and debuggers can point to
the original file instead of to the intermediate C++ source
file.