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Zig nif library

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zigler lib zig templates on_unload.zig.eex
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lib/zig/templates/on_unload.zig.eex 

// TODO: deprecate this content being an elixir template and provide it entirely

// using Zig comptime logic.

fn unload(env: beam.env, priv_data: ?*anyopaque) callconv(.c) void {

    beam.context.env = env;

    beam.context.mode = .callback;

    beam.context.allocator = beam.allocator;

    beam.context.io = beam.io.get(beam.allocator);

<%= case @on_unload do %>

  <% %{name: name, arity: 1} -> %>

    nif.<%= name %>(@ptrCast(@alignCast(priv_data)));

  <% %{name: name, arity: 2} -> %>

    nif.<%= name %>(env, priv_data);

<% end %>

    beam.io.deinitGlobal();

}