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;
}
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