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Fixed an error on using more than one shutter
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Stefan Bode
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Oct 17, 2018
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This directory is intended for project header files. | ||
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A header file is a file containing C declarations and macro definitions | ||
to be shared between several project source files. You request the use of a | ||
header file in your project source file (C, C++, etc) located in `src` folder | ||
by including it, with the C preprocessing directive `#include'. | ||
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```src/main.c | ||
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#include "header.h" | ||
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int main (void) | ||
{ | ||
... | ||
} | ||
``` | ||
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Including a header file produces the same results as copying the header file | ||
into each source file that needs it. Such copying would be time-consuming | ||
and error-prone. With a header file, the related declarations appear | ||
in only one place. If they need to be changed, they can be changed in one | ||
place, and programs that include the header file will automatically use the | ||
new version when next recompiled. The header file eliminates the labor of | ||
finding and changing all the copies as well as the risk that a failure to | ||
find one copy will result in inconsistencies within a program. | ||
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In C, the usual convention is to give header files names that end with `.h'. | ||
It is most portable to use only letters, digits, dashes, and underscores in | ||
header file names, and at most one dot. | ||
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Read more about using header files in official GCC documentation: | ||
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* Include Syntax | ||
* Include Operation | ||
* Once-Only Headers | ||
* Computed Includes | ||
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https://gcc.gnu.org/onlinedocs/cpp/Header-Files.html |
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