问题标题: 8个C宏实现vector

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

typedef struct {
    size_t len;
    size_t typ_siz;
    void *data;
} __do_vector, *vector_t;

vector_t __do_vector_new(size_t siz) {
    vector_t vec = (vector_t)malloc(sizeof(__do_vector));
    vec->len = 0;
    vec->typ_siz = siz;
    vec->data = malloc(1);
    return vec;
}
void __do_vector_free(vector_t vec) {
    free(vec->data);
    free(vec);
}
void __do_vector_push_back(vector_t vec, const void *dat) {
    vec->data = realloc(vec->data, (vec->len + 1) * vec->typ_siz);
    memcpy(vec->data + vec->len * vec->typ_siz, dat, vec->typ_siz);
    vec->len++;
}
void __do_vector_pop_back(vector_t vec) {
    assert(vec->len > 0);
    vec->data = realloc(vec->data, (vec->len - 1) * vec->typ_siz);
    vec->len--;
}
void __do_vector_erase(vector_t vec, size_t idx) {
    assert(idx >= 0);
    assert(idx < vec->len);
    for (size_t i = idx + 1; i < vec->len; i++) {
        memcpy(vec->data + (i - 1) * vec->typ_siz, vec->data + i * vec->typ_siz, vec->typ_siz);
    }
    __do_vector_pop_back(vec);
}

#define vec_new(type) (__do_vector_new(sizeof(type)))
#define vec_free(vec) (__do_vector_free(vec))
#define vec_pushb(vec, data) (__do_vector_push_back(vec, data))
#define vec_popb(vec) (__do_vector_pop_back(vec))
#define vec_erase(vec, idx) (__do_vector_erase(vec, idx))
#define vec_get(vec, idx) (vec->data + idx * vec->typ_siz)
#define vec_getv(type, vec, idx) (*(type *)vec_get(vec, idx))
#define vec_size(vec) (vec->len)


#include <stdio.h>
int main() {
    vector_t arr = vec_new(int);
    for (int i = 100; i >= 1; i--) {
        vec_pushb(arr, &i);
    }
    vec_erase(arr, 0);
    vec_popb(arr);
    vec_erase(arr, vec_size(arr) - 1);
    for (int i = 0; i < vec_size(arr); i++) {
        printf("%d: %d\n", i, vec_getv(int, arr, i));
    }
    vec_free(arr);
    return 0;
}

纯C语言，不是C++哦（当然C++也能用）

薛乘志在2023-03-17 21:39:30追加了内容

源码链接：https://github.com/xgugugu/vec8/blob/main/vector.c