回答編集履歴
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answer
CHANGED
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@@ -1,15 +1,22 @@
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```c
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#include <stdlib.h>
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#include <stdbool.h>
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typedef struct MISSILE {
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double x;
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double y;
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double angle;
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double speed;
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}
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typedef struct tag_missile_vec {
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MISSILE* data;
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size_t size;
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size_t capacity;
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} missile_vec;
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missile_vec* missile_vec_new(size_t size, double x, double y, double angle, double speed) {
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missile_vec* missile_vec_new(size_t size, size_t capacity, double x, double y, double angle, double speed) {
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if(capacity < size) return NULL;
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missile_vec* missile;
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if(NULL = (missile->data = malloc(
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if(NULL = (missile->data = malloc(capacity * sizeof(MISSILE))) return NULL;
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for(size_t i = 0; i < size; ++i){
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MISSILE* m = &missile->data[i];
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m->x = x;
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@@ -18,8 +25,21 @@
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m->speed = speed;
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}
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missile->size = size;
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missile->capacity = capacity;
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return missile;
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}
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bool missile_vec_push(missile_vec* missile, const MISSILE* data)
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{
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if(NULL == missile || NULL == data) return false;
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if(capacity < size + 1){
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const size_t new_capacity = ((SIZE_MAX / 2) < missile->capacity) ? SIZE_MAX : missile->capacity * 2;
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if(NULL == (missile->data = realloc(missile->data, capacity * sizeof(MISSILE)))) return false;
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missile->capacity = new_capacity;
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}
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missile->data[missile->size] = *data;
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++missile->size;
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return true;
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}
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void missile_vec_delete(missile_vec* missile)
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{
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if(NULL != missile) free(missile->data);
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@@ -27,10 +47,11 @@
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}
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void missile_vec_draw(missile_vec* missile)
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{
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if(NULL == missile) return;
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//do something
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}
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int main(){
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-
missile_vec* missile = missile_vec_new(10, 0, 0, 0, 0);
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missile_vec* missile = missile_vec_new(10, 20, 0, 0, 0, 0);
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if(NULL == missile) return 1;
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missile_vec_draw(missile);
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missile_vec_delete(missile);
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