Resource acquisition is initialization: Difference between revisions

Revision as of 09:11, 17 July 2022

Revision as of 21:27, 24 July 2022

Line 116:

| work=Using the GNU Compiler Collection (GCC)

| publisher=[[GNU Project]]

| access-date=2019-03-09}}</ref> The following [[macro (computer science)|macro]] annotates a variable with a given destructor function that it will call when the variable goes out of scope:

<syntaxhighlight lang=c>

static inline void fclosep(FILE **fp) { if (*fp) fclose(*fp); }

#define _cleanup_fclose_ __attribute__((cleanup(fclosep)))

</syntaxhighlight>

This macro can then be used as follows:

<syntaxhighlight lang=c>

void example_usage() {

_cleanup_fclose___attribute__((cleanup(fclosep))) FILE *logfile = fopen("logfile.txt", "w+");

fputs("hello logfile!", logfile);

}