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April 22, 2017 04:41
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Generic Data Structures in C
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#include "qvec.h" | |
typedef char* string; | |
typedef struct { | |
int x, y; | |
} Tuple; | |
int main(void) | |
{ | |
qvec(string) *sv = qvec_new(string, "Who", "are", "you?"); | |
qvec_print(sv); | |
qvec_at(sv, 2) = "we?"; | |
qvec_print(sv); | |
qvec_free(sv); | |
qvec(int) *iv = qvec_new(int, 1, 2, 3, 4); | |
qvec_print(iv); | |
printf("%d\n", qvec_pop(iv)); | |
qvec_free(iv); | |
qvec(Tuple) *tv = qvec_new(Tuple, { .x = 0, .y = 1 }, { 4, 2 }, { 5, 4 }); | |
printf("%d\n", qvec_at(tv, 1).x); | |
printf("%d\n", qvec_at(tv, 2).x); | |
qvec_free(tv); | |
} |
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/* | |
* A macro-based generic vector. | |
* | |
* Requires a C11 compiler with support for various GCC extensions. | |
* | |
* ----------------------------------------------------------------------------- | |
* | |
* The MIT License (MIT) | |
* | |
* Copyright (c) 2017 Marc Tiehuis | |
* | |
* Permission is hereby granted, free of charge, to any person obtaining a copy | |
* of this software and associated documentation files (the "Software"), to | |
* deal in the Software without restriction, including without limitation the | |
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or | |
* sell copies of the Software, and to permit persons to whom the Software is | |
* furnished to do so, subject to the following conditions: | |
* | |
* The above copyright notice and this permission notice shall be included in | |
* all copies or substantial portions of the Software. | |
* | |
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | |
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | |
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | |
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | |
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
* SOFTWARE. | |
* | |
*/ | |
#ifndef QVEC_H | |
#define QVEC_H | |
#include <stdio.h> | |
#include <stdlib.h> | |
#define QVEC_ALEN(a) (sizeof(a) / sizeof(*a)) | |
#define qvec_base \ | |
struct { \ | |
size_t cap, len;\ | |
} | |
#define qvec(T) \ | |
struct qvec_##T { \ | |
qvec_base; \ | |
T data[]; \ | |
} | |
#define qvec_new(T, xs...) \ | |
({ \ | |
const size_t initial_size = 16; \ | |
const T _xs[] = {xs}; \ | |
struct qvec_##T *v = malloc(sizeof(qvec(T)) + sizeof(T) * QVEC_ALEN(_xs));\ | |
v->cap = initial_size; \ | |
v->len = QVEC_ALEN(_xs); \ | |
\ | |
for (int i = 0; i < v->len; ++i) \ | |
v->data[i] = _xs[i]; \ | |
\ | |
v; \ | |
}) | |
#define qvec_free(v) free(v) | |
#define qvec_pop(v) (v->data[--v->len]) | |
#define qvec_ref(v, i) (&v->data[i]) | |
#define qvec_at(v, i) (*(qvec_ref(v, i))) | |
#define qvec_push(v, xs...) \ | |
({ \ | |
const typeof(*v->data) _xs[] = {xs}; \ | |
if (v->len + ALEN(_xs) >= v->cap) { \ | |
while (v->cap <= v->len + alen(_xs)) { \ | |
v->cap = 2 * v->cap; \ | |
} \ | |
v = realloc(v, sizeof(qvec_base) + v->cap * sizeof(*v->data)); \ | |
} \ | |
for (int i = 0; i < ALEN(_xs); ++i) { \ | |
v->data[v->len++] = _xs[i]; \ | |
} \ | |
v; \ | |
}) | |
#define GET_FMT_SPEC(x) _Generic((x), int: "%d", float: "%f", char*: "%s") | |
#define qvec_print(v) \ | |
({ \ | |
printf("["); \ | |
for (int i = 0; i < v->len; ++i) { \ | |
printf(GET_FMT_SPEC(v->data[i]), v->data[i]); \ | |
if (i + 1 < v->len) \ | |
printf(", "); \ | |
} \ | |
printf("]\n"); \ | |
}) | |
#ifdef QVEC_USE_RAII | |
static inline _qvec_free(void **qvec) { free(*qvec); } | |
#define raii __attribute__ ((cleanup(_qvec_free))) | |
#endif | |
#endif |
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