Pseudo lambda for C

main.c

#inclued <stdio.h>

/**
 * Defines the callback signature
 */
typedef int (*callback_t)(void *);

/**
 * Simulates a proccess that inform using a callback
 * each time it proccess some data.
 * @param callback Each time a item is proccesed this
 *        function is called
 */
void process(callback_t callback) {
    int i;
    for (i = 0; i < 10; i++)
        callback(&i);
}

int main(void) {
    /* Call proccess creating a anonymous function that
    * prints the proccessed elements. This function acts
    * like a lambda.
    */
    process(
        ({
            int _(void* data) {
                printf("The value is %d\n", *(int *)data);
            }
            /* Return the method pointer */
            _;
        })
    );
    return 0;
}