# `Continuum.Pure`
[🔗](https://github.com/Yyeger/Continuum/blob/main/lib/continuum/pure.ex#L1)

Mark a module as a pure helper that may be called from workflow code.

The `Continuum.AstCheck` scanner runs over every function in the module
as it is defined; non-deterministic calls become compile errors.

    defmodule MyApp.PriceMath do
      use Continuum.Pure

      def total(items), do: Enum.reduce(items, 0, & &1.price + &2)
    end

Trusted stdlib modules (`Enum`, `Map`, `String`, …) do not need this; see
`Continuum.AstCheck.trusted_stdlib/0` for the baked-in allowlist.

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*Consult [api-reference.md](api-reference.md) for complete listing*