/c_defer

defer and scopeguard for C

Primary LanguageC

Defer and Scopeguard for C

Feature

  • scope_exit

execute statements on scope exit.

  1. basic usage:
scope_exit({
    printf("scopt exit!!!\n");
});
  1. capture expr-value into scope-closure
char* str1 = strdup("1234567890");

// capture str1 to scope-closure
scope_exit1(str1, free(str1));

str1 = NULL;
  • defer

same as golang's defer. execute statement before function return, release some resouce here.

  1. basic usage:
defer_init(1024, NULL); // init defer on stack

// defer statement
defer({
    // you can access external variable by-ref here !
    printf("defer is called!\n");
});
  1. capture expr-value into defer-closure
char* str1 = malloc(100); // alloc resource

// capture str1 into anonymouse closure and register it
defer1(str1, {
    // captured str1 is local variable of closure
    free(str1); // release resource
});

str1 = NULL;  // str1 is captured by closure, here

Example

see test1.c for more.

Requirement

this implementation use following gcc-features:

  • nested function

  • statement expressions

  • cleanup attributes

License

MIT