Odin/core/runtime/default_allocators_windows.odin

//+build windows
package runtime

default_allocator_proc :: proc(allocator_data: rawptr, mode: Allocator_Mode,
                                size, alignment: int,
                                old_memory: rawptr, old_size: int, loc := #caller_location) -> (data: []byte, err: Allocator_Error) {
	switch mode {
	case .Alloc:
		data, err = _windows_default_alloc(size, alignment)

	case .Free:
		_windows_default_free(old_memory)

	case .Free_All:
		// NOTE(tetra): Do nothing.

	case .Resize:
		data, err = _windows_default_resize(old_memory, old_size, size, alignment)

	case .Query_Features:
		set := (^Allocator_Mode_Set)(old_memory)
		if set != nil {
			set^ = {.Alloc, .Free, .Resize, .Query_Features}
		}

	case .Query_Info:
		// Do nothing
	}

	return
}

default_allocator :: proc() -> Allocator {
	return Allocator{
		procedure = default_allocator_proc,
		data = nil,
	}
}