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#include "vec.h"
#include <string.h>
#include "stdlib.h"
struct vec {
size_t length;
size_t capacity;
void** buf;
};
static void vec_enlarge(struct vec* self) {
self->buf = realloc(self->buf, self->capacity * sizeof(void*) * 2);
self->capacity = self->capacity * 2;
}
void *new_vec() {
struct vec* vec = malloc(sizeof(struct vec));
vec->length = 0;
vec->capacity = 16;
vec->buf = malloc(16 * sizeof(void*));
return vec;
}
void vec_push_back(void *self_, void* obj) {
struct vec *self = self_;
if (self->length == self->capacity) vec_enlarge(self);
self->buf[self->length] = obj;
self->length++;
}
void* vec_get(void *self_, size_t n) {
struct vec *self = self_;
if (n < 0 || n >= self->length) return NULL;
return self->buf[n];
}
void vec_erase(void *self_, size_t n) {
struct vec *self = self_;
if (self->length <= n) {
return;
}
memmove(self->buf + n, self->buf + n + 1, (self->length - n - 1) * sizeof(void*));
self->length--;
}
size_t vec_size(void *self_) {
struct vec *self = self_;
return self->length;
}
void vec_reserve(void *self_, size_t n) {
struct vec *self = self_;
if (n <= self->capacity) {
return;
}
self->buf = malloc(sizeof(void*) * n);
self->capacity = n;
}
void vec_insert(void *self_, size_t pos, void *obj) {
struct vec *self = self_;
if (self->length == self->capacity) {
vec_enlarge(self);
}
if (pos > self->length || pos < 0) return;
memmove(self->buf + pos + 1, self->buf + pos, sizeof(void*) * (self->length - pos));
self->buf[pos] = obj;
self->length++;
}
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