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defmodule Stack do
use GenServer
# Client
def start_link(default) when is_list(default) do
GenServer.start_link(__MODULE__, default)
end
def push(pid, element) do
GenServer.cast(pid, {:push, element})
end
def pop(pid) do
GenServer.call(pid, :pop)
end
# Server (callbacks)
@impl true
def init(stack) do
{:ok, stack}
end
@impl true
def handle_call(:pop, _from, [head | tail]) do
{:reply, head, tail}
end
@impl true
def handle_cast({:push, element}, state) do
{:noreply, [element | state]}
end
end
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