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add zig arena allocator example
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zig-arena-allocator.md
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zig-arena-allocator.md
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[[zig.md]]
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```zig
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pub fn init(allocator: std.mem.Allocator) !GameData {
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var aa = std.heap.ArenaAllocator.init(allocator);
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return .{
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.arena_allocator = aa,
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.id_list = try aa.allocator().alloc(u64, 0),
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.model_list = try aa.allocator().alloc(Mesh, 0),
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.position_x_list = try aa.allocator().alloc(f64, 0),
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.position_y_list = try aa.allocator().alloc(f64, 0),
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};
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}
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pub fn deinit(self: *GameData) void {
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self.arena_allocator.deinit();
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}
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```
zig.md
zig.md
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