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list_optimised.c
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list_optimised.c
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#include "list_optimised.h" // For declarations. Note double quotes for project file, rather than <>
#include <stdio.h> // For printf()
#include <stdlib.h> // For realloc, free
List list_init(void) {
return (List) {.len = 0, .capacity = 0, .data = NULL};
}
// Reserve space for `elements` extra elements
void list_reserve(List* list, const size_t elements) {
size_t new_capacity = list->len + elements;
// No need to reallocate if we already have the space
if (new_capacity <= list->capacity)
return;
list->data = (double*)realloc(list->data, sizeof(double) * (list->len + elements));
list->capacity = new_capacity;
}
void list_destroy(List* list) {
if (list->data != NULL)
free(list->data);
list->data = NULL; // Null out data pointer for easier detection of use-after-free bugs
list->len = 0;
list->capacity = 0;
}
void list_append(List* list, const double value) {
list_reserve(list, 1); // Make space for the new element
list->data[list->len] = value;
list->len++;
}
void list_insert(List* list, const size_t index, const double val) {
list_reserve(list, 1); // Make space for the new element
for (double* item = list->data + list->len; item > list->data + index; --item)
*item = *(item - 1);
list->len++;
list->data[index] = val;
}
double list_pop(List* list, const size_t index) {
double* item = &list->data[index];
double out = *item;
for (; item < list->data + list->len - 1; ++item)
*item = *(item+1);
list->len--;
// No need to reallocate, just leave capacity untouched.
return out;
}
void list_print(List list) {
printf("{\n\tlen: %ld\n\tdata: %p\n}\n", list.len, (void*)list.data);
}
void list_print_contents(List list) {
printf("[");
// Loop through pointers to each element of the list
for (double* v = list.data; v < list.data + list.len; ++v) {
// Print ", " before all elements except the first.
if (v != list.data)
printf(", %g", *v);
else
printf("%g", *v);
}
printf("]\n");
}