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Should I use #include in headers?

Asked 2009-11-26T15:55:01.720
85

Is it necessary to #include some file, if inside a header (*.h), types defined in this file are used?

For instance, if I use GLib and wish to use the gchar basic type in a structure defined in my header, is it necessary to do a #include <glib.h>, knowing that I already have it in my *.c file?

If yes do I also have to put it between the #ifndef and #define or after the #define?

c c-preprocessor file-organization
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I use the following construct to be sure, that the needed include file is included before this include. I include all header files in source files only.

#ifndef INCLUDE_FILE_H
 #error "#include INCLUDE.h" must appear in source files before "#include THISFILE.h"
#endif
answered 2009-11-26T17:04:46.853

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