C Language, header in header files

header in header files

Author	Message
Zimmen Gnau #1 / 4	header in header files Most .h files contains a header like the following: #ifndef _STDIO_H # define _STDIO_H 1 .... Is there any tool to generate this header automatically from a plain header file?
Mon, 18 Jul 2005 13:05:27 GMT

Jack Klei #2 / 4	header in header files wrote in comp.lang.c: Quote: > Most .h files contains a header like the following: > #ifndef _STDIO_H > # define _STDIO_H 1 > .... > Is there any tool to generate this header automatically from a plain > header file? Actually only header files should have macros using that format. The C language standard reserves all symbols beginning with two underscores in a row, or an underscore followed by an upper case letter, for the implementation, that is the compiler. You should provide include guards in header files that you write yourself, but if you are going to write a file named, for example, header.h, how hard is it to write these two lines at the top: #ifndef HEADER_H #define HEADER_H ...then add the contents of your header, and a final line at the bottom: #endif If that is really too much trouble, just think how hard it is going to be to get the rest of the contents, in between those lines, right. -- Jack Klein Home: http://JK-Technology.Com FAQs for comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html comp.lang.c++ http://www.parashift.com/c++-faq-lite/ alt.comp.lang.learn.c-c++ ftp://snurse-l.org/pub/acllc-c++/faq
Mon, 18 Jul 2005 13:44:06 GMT

Kevin Easto #3 / 4	header in header files Quote: > wrote in comp.lang.c: >> Most .h files contains a header like the following: >> #ifndef _STDIO_H >> # define _STDIO_H 1 >> .... >> Is there any tool to generate this header automatically from a plain >> header file? > Actually only header files should have macros using that format. The > C language standard reserves all symbols beginning with two > underscores in a row, or an underscore followed by an upper case > letter, for the implementation, that is the compiler. > You should provide include guards in header files that you write > yourself, but if you are going to write a file named, for example, > header.h, how hard is it to write these two lines at the top: > #ifndef HEADER_H > #define HEADER_H If you switch to using: #ifndef H_HEADER_ #define H_HEADER_ then you'll be able to create header files starting with the letter E. - Kevin.
Mon, 18 Jul 2005 14:44:41 GMT

Jack Klei #4 / 4	header in header files wrote in comp.lang.c: Quote: > > wrote in comp.lang.c: > >> Most .h files contains a header like the following: > >> #ifndef _STDIO_H > >> # define _STDIO_H 1 > >> .... > >> Is there any tool to generate this header automatically from a plain > >> header file? > > Actually only header files should have macros using that format. The > > C language standard reserves all symbols beginning with two > > underscores in a row, or an underscore followed by an upper case > > letter, for the implementation, that is the compiler. > > You should provide include guards in header files that you write > > yourself, but if you are going to write a file named, for example, > > header.h, how hard is it to write these two lines at the top: > > #ifndef HEADER_H > > #define HEADER_H > If you switch to using: > #ifndef H_HEADER_ > #define H_HEADER_ > then you'll be able to create header files starting with the letter E. > - Kevin. Good point. -- Jack Klein Home: http://JK-Technology.Com FAQs for comp.lang.c http://www.eskimo.com/~scs/C-faq/top.html comp.lang.c++ http://www.parashift.com/c++-faq-lite/ alt.comp.lang.learn.c-c++ ftp://snurse-l.org/pub/acllc-c++/faq
Thu, 21 Jul 2005 15:34:40 GMT

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