Arena Allocator implementation in pure C as an stb-style single-file library.
I just caught myself implementing this over and over again in my projects, so I decided to turn it into a copy-pastable library similar to sv
The truly reusable code is the one that you can simply copy-paste.
The library itself does not require any special building. You can simple copy-paste ./arena.h to your project and #include it.
#define ARENA_IMPLEMENTATION #include "arena.h" static Arena default_arena = {0}; static Arena temporary_arena = {0}; static Arena *context_arena = &default_arena; void *context_alloc(size_t size) { assert(context_arena); return arena_alloc(context_arena, size); } int main(void) { // Allocate stuff in default_arena context_alloc(64); context_alloc(128); context_alloc(256); context_alloc(512); // Allocate stuff in temporary_arena; context_arena = &temporary_arena; context_alloc(64); context_alloc(128); context_alloc(256); context_alloc(512); // Deallocate everything at once arena_free(&default_arena); arena_free(&temporary_arena); return 0; }