line directive

#line directive

Changes the line number in error messages

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 #line   digits   #line   digits     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.

See Also

#error directive