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September 8, 2024 09:43
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lambdas in C
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| /** Lambdas in C. Compile with GCC! | |
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| * | |
| * https://www.x.com/7etsuo | |
| */ | |
| #include <stdio.h> | |
| #include <stdlib.h> | |
| typedef struct | |
| { | |
| int multiplier; | |
| int offset; | |
| } context_t; | |
| typedef struct | |
| { | |
| int (*func) (int, void *); | |
| void *context; | |
| } lambda_t; | |
| #define lambda(return_type, context_type, context_ptr, body) \ | |
| ({ \ | |
| return_type __fn__ (int x, void *context) body lambda_t l \ | |
| = {.func = __fn__, \ | |
| .context = (void *) context_ptr }; \ | |
| l; \ | |
| }) | |
| int * | |
| map (int *arr, int size, lambda_t lambda_func) | |
| { | |
| int *result = malloc (size * sizeof (int)); | |
| if (result == NULL) | |
| { | |
| fprintf (stderr, "malloc() \n"); | |
| return NULL; | |
| } | |
| for (int i = 0; i < size; i++) | |
| result[i] = lambda_func.func (arr[i], lambda_func.context); | |
| return result; | |
| } | |
| int | |
| main (int argc, char **arv) | |
| { | |
| int arr[] = {1, 2, 3, 4, 5}; | |
| int size = sizeof (arr) / sizeof (arr[0]); | |
| context_t context = {.multiplier = 3, .offset = 2}; | |
| lambda_t multiplier_with_offset = lambda (int, context_t, &context, { | |
| context_t *ctx = (context_t *) context; | |
| return (x * ctx->multiplier) + ctx->offset; | |
| }); | |
| int *modified = map (arr, size, multiplier_with_offset); | |
| if (modified == NULL) | |
| return EXIT_FAILURE; | |
| printf ("Modified: "); | |
| for (int i = 0; i < size; i++) | |
| printf ("%d ", modified[i]); | |
| free (modified); | |
| return EXIT_SUCCESS; | |
| } |
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