1. Си / Говнокод #25013

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    #include <stdio.h>
#include <stdlib.h>
#include <stdalign.h>
#include <inttypes.h>
#include <string.h>

float sum_f(const float arr[], const size_t len);
int32_t sum_i32t(const int32_t arr[], const size_t len);

#define sum(a, b) _Generic((a), float*:   sum_f, \
                             const float*:   sum_f, \
                             int32_t*: sum_i32t,\
                             const int32_t*: sum_i32t)(a, b)


// foldl (+) 0 arr
float sum_f(const float arr[], const size_t len)
{
  return (len != 0) ? ( sum(arr+1, len-1) + arr[0] ) : 0;
}

int32_t sum_i32t(const int32_t arr[], const size_t len)
{
  return (len != 0) ? ( sum(arr+1, len-1) + arr[0] ) : 0;
}

enum { we_want_int, we_want_float } what_we_want;

void test(int www)
{
  void *a;
  if (www == we_want_int)
  {
    uint8_t buf[sizeof(int32_t[10])] __attribute__ ((aligned (alignof(int32_t[10]))));
    a = (void *) buf;
    memcpy ( a, (int32_t[10]){1,2,3,4,5,6,7,8,9,10},
             sizeof((int32_t[10]){1,2,3,4,5,6,7,8,9,10})
            );
    printf("%" PRIi32 "\n", sum((int32_t *)a, 10));
  }
  else if (www == we_want_float)
  {
    uint8_t buf[sizeof(float[10])] __attribute__ ((aligned (alignof(float[10]))));
    a = (void *) buf;
    memcpy ( a, (float[10]){1,2,3,4,5,6,7,8,9,10},
             sizeof((float[10]){1,2,3,4,5,6,7,8,9,10})
            );
    printf("%f\n", sum((float *)a, 10));    
  }
}

int main(void)
{
  test(we_want_int);
  test(we_want_float);
  return EXIT_SUCCESS;
}

    https://wandbox.org/permlink/TwbKHE8l7ZJc6PNI
    https://govnokod.ru/25005#comment436646
    https://i.imgur.com/yFYfuED.jpg

    Запостил: j123123, 23 Октября 2018

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