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  1. #include <stdio.h>
  2. #include <stdlib.h>
  3. #include <string.h>
  4.  
  5. #define defer(stmt) __defer__ __defer__var__ = {stmt}
  6.  
  7. // A structure to hold the deferred statement
  8. typedef struct {
  9.     void (*stmt)(void);
  10. } __defer__;
  11.  
  12. // Define the defer structure with a cleanup function
  13. void cleanup(void) {
  14.     printf("Cleaning up resources.\n");
  15. }
  16.  
  17. // The main function that uses the defer mechanism
  18. int main(void) {
  19.     // Dynamic memory allocation
  20.     char *test = malloc(14 * sizeof(char));
  21.     if (!test) {
  22.         perror("malloc failed");
  23.         return 1;
  24.     }
  25.  
  26.     // Initialize the string
  27.     strncpy(test, "Hello, World!", 13);
  28.     test[13] = '\0';  // null-terminate properly
  29.  
  30.     // Print the string
  31.     printf("test string = \"%s\"\n", test);
  32.  
  33.     // Using the defer macro
  34.     defer(cleanup);  // The deferred cleanup will be run on scope exit
  35.  
  36.     // After the defer statement is invoked, you can write more code here.
  37.     // But cleanup happens automatically when the scope exits.
  38.  
  39.     // Manually free memory
  40.     free(test);
  41.  
  42.     // The deferred code will execute when we reach this point in the code.
  43.     return 0;
  44.  
  45.     // Defer will be executed after this point, simulating Zig's defer behavior.
  46. }
  47.  
Success #stdin #stdout 0.01s 5288KB
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Standard input is empty
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test string = "Hello, World!"
https://ideone.com/w11wjX
language:
C (clang 8.0)
created:
3 days ago
visibility:
public

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