C言語でusing的な構文 ref: http://qiita.com/ykst/items/c045104ab9c0108ba166

file1.c

    using(something, 100) {
        something_show(this);
    }

main.c

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

#define using(class, ...) for (class##_handle this = class##_create(__VA_ARGS__), ___do_loop = this; (___do_loop != NULL) || ({ class##_delete(this); 0; }); ___do_loop = NULL)

struct something {
    int param;
};

typedef struct something *something_handle;

something_handle something_create(int param)
{
    something_handle new_handle = (something_handle)calloc(1, sizeof(*new_handle));

    new_handle->param = param;

    return new_handle;
}

void something_show(something_handle h)
{
    printf("param = %d\n", h->param);
}

void something_delete(something_handle h)
{
    if (h) {
        free(h);
    }
}

int main(int argc, char **argv)
{
    using (something, 100) {
        something_show(this);
    }
}

using.h

#define using(class, ...) for (class##_handle this = class##_create(__VA_ARGS__), ___do_loop = this; (___do_loop != NULL) || ({ class##_delete(this); 0; }); ___do_loop = NULL)