Ruby 1.8.7 リファレンスマニュアル > ライブラリ一覧 > mkmfライブラリ > Kernelモジュール > have_struct_member (private)
have_struct_member(type, member, headers = nil, &b) [added by mkmf]
Returns whether or not the struct of type +type+ contains +member+. If it does not, or the struct type can't be found, then false is returned. You may optionally specify additional +headers+ in which to look for the struct (in addition to the common header files).
If found, a macro is passed as a preprocessor constant to the compiler using the member name, in uppercase, prepended with 'HAVE_ST_'.
For example, if have_struct_member('foo', 'bar') returned true, then the HAVE_ST_BAR preprocessor macro would be passed to the compiler.