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0.1.0
A dependency-free utility library containing 100+ useful functions.
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lib/protocol.ex
defmodule Moar.Protocol do
# @related [test](/test/protocol_test.exs)
@moduledoc "Protocol-related functions."
@doc """
Returns `x` or raises if `x` does not implment `protocol`.
```elixir
iex> Moar.Protocol.implements!(~D[2000-01-02], String.Chars)
~D[2000-01-02]
```
"""
@spec implements!(any(), module()) :: any()
def implements!(x, protocol) do
if protocol.impl_for(x) == nil,
do: raise("Expected #{inspect(x)} to implement protocol #{inspect(protocol)}"),
else: x
end
end