Memory Arena + Arena allocated dynamic array implementation in C99

Usage

To use it in your project just get it by:

• curl

curl -O https://raw.githubusercontent.com/mirsahebali/carena.h/refs/heads/main/carena.h

• wget

wget https://raw.githubusercontent.com/mirsahebali/carena.h/refs/heads/main/carena.h

• git

git clone --depth 1 https://github.com/mirsahebali/carena.h

Using in your project

#define CARENA_IMPLEMENTATION
#include "path/of/deps/carena.h"

Reference

Arena API

Arena arena_init(size_t size);

void *arena_alloc(Arena *self, size_t size, size_t alignment);

// OR use convenience macro(recommended)
ARENA_ALLOC(arena, type, length);

void arena_destroy(Arena *self);

convenience macro is recommended as it makes the type display explicit

Dynamic Array API(allocated in the arena)

void *array_init(Arena *arena, size_t item_size, size_t capacity,
                 size_t alignment);
size_t array_push(void *array, void *data);
void *array_get(void *array, size_t item_size, size_t alignment, size_t index);
// Get the pointer with points to that memory location in the array(NOT recommended) but use if needed
void *array_get_ref(void *array, size_t item_size, size_t alignment,
                    size_t index);

// Use convenience macros for strong type display
ARRAY_PUSH(array, type, data);

ARRAY_GET(array, type, index);

// get reference to that element
ARRAY_GET_REF(array, type, index);


// Other helper functions to use

ARRAY_CAPACITY(array, type);
ARRAY_LENGTH(array, type);
// the _ArrayHeader which contains meta data for the array
ARRAY_HEADER_T(array, type);

[NOTE] No need to free the array as it allocated in the arena, it will automatically rellocated when elements are pushed It will all be freed at once