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  1. #include <assert.h>
  2. #include <stdio.h>
  3. #include <string.h>
  4.  
  5. #define yoba_swap(foo, bar) do {  \
  6.     char temp[sizeof(foo)];             \
  7.     assert(sizeof(foo) == sizeof(bar)); \
  8.     memcpy(&temp, &foo, sizeof(foo));   \
  9.     memcpy(&foo, &bar, sizeof(foo));    \
  10.     memcpy(&bar, &temp, sizeof(foo));   \
  11. } while (0)
  12.  
  13.  
  14. int main(void)
  15. {
  16.     printf("Arrays:\n");
  17.     int a1[3] = { 1, 2, 3 };
  18.     int a2[3] = { 4, 5, 6 };
  19.     printf("Before: a1 = { %d, %d, %d }; a2 = { %d, %d, %d }\n", a1[0], a1[1], a1[2], a2[0], a2[1], a2[2]);
  20.     yoba_swap(a1, a2);
  21.     printf("After:  a1 = { %d, %d, %d }; a2 = { %d, %d, %d }\n", a1[0], a1[1], a1[2], a2[0], a2[1], a2[2]);
  22.     printf("Single values:\n");
  23.     double d1 = 1.0;
  24.     double d2 = 2.0;
  25.     printf("Before: d1 = %g, d2 = %g\n", d1, d2);
  26.     yoba_swap(d1, d2);
  27.     printf("After:  d1 = %g, d2 = %g\n", d1, d2);
  28. }
  29.  
Success #stdin #stdout 0s 10304KB
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Standard input is empty
stdout
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Arrays:
Before: a1 = { 1, 2, 3 }; a2 = { 4, 5, 6 }
After:  a1 = { 4, 5, 6 }; a2 = { 1, 2, 3 }
Single values:
Before: d1 = 1, d2 = 2
After:  d1 = 2, d2 = 1
https://ideone.com/kmidbZ
language:
C99 (gcc 8.3)
created:
8 years ago
visibility:
secret

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