-One use of %ignore is to selectively remove certain declarations from a header file without having +Any function, variable etc which matches %ignore will not be wrapped and therefore will not be available from the target language. +A common usage of %ignore is to selectively remove certain declarations from a header file without having to add conditional compilation to the header. However, it should be stressed that this only works for simple declarations. If you need to remove a whole section of problematic code, the SWIG preprocessor should be used instead.