arena_allocator

Source

Code

1package arena_allocator
2
3import "core:fmt"
4import "core:os"
5
6// virtual package implements a multi-purpose arena allocator. If you are on a
7// platform that does not support virtual memory, then there is also a similar
8// arena in `core:mem`.
9import vmem "core:mem/virtual"
10
11load_files :: proc() -> ([]string, vmem.Arena) {
12	// This creates a growing virtual memory arena. It uses virtual memory and
13	// can grow as things are added to it.
14	arena: vmem.Arena
15	arena_err := vmem.arena_init_growing(&arena)
16	ensure(arena_err == nil)
17	arena_alloc := vmem.arena_allocator(&arena)
18
19	// See arena_init_static for an arena that uses virtual memory, but cannot grow.
20
21	// See arena_init_buffer for an arena that does not use virtual memory,
22	// instead it relies on you feeding it a buffer.
23
24	f1, f1_err := os.read_entire_file("file1.txt", arena_alloc)
25	ensure(f1_err == nil)
26
27	f2, f2_err := os.read_entire_file("file2.txt", arena_alloc)
28	ensure(f2_err == nil)
29
30	f3, f3_err := os.read_entire_file("file3.txt", arena_alloc)
31	ensure(f3_err == nil)
32
33	res := make([]string, 3, arena_alloc)
34	res[0] = string(f1)
35	res[1] = string(f2)
36	res[2] = string(f3)
37
38	return res, arena
39}
40
41main :: proc() {
42	files, arena := load_files()
43
44	for f in files {
45		fmt.println(f)
46	}	
47
48	// This deallocates everything that was allocated on the arena:
49	// The loaded content of the files as well as the `files` slice.
50	vmem.arena_destroy(&arena)
51}

Other Files

This is from file1.txt

This is from file2.txt

This is from file3.txt

Declarations Used 6

• core:fmt println
• core:mem/virtual Arena · arena_allocator · arena_destroy · arena_init_growing
• core:os read_entire_file