sink.hpp

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//
// Copyright (C) 2014, 2015 Ableton AG, Berlin. All rights reserved.
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#pragma once

#include <atria/xform/transducer_impl.hpp>
#include <atria/estd/functional.hpp>

namespace atria {
namespace xform {

namespace detail {

struct sink_rf_gen
{
  template <typename ReducingFnT,
            typename ActionT>
  struct apply
  {
    ReducingFnT step;
    ActionT action;

    template <typename State, typename ...Inputs>
    auto operator() (State&& s, Inputs&& ...is)
      -> decltype(step(std::forward<State>(s)))
    {
      estd::invoke(action, std::forward<Inputs>(is)...);
      return step(std::forward<State>(s));
    }
  };
};

} // namespace detail

template <typename T>
using sink_t = transducer_impl<detail::sink_rf_gen, T>;

template <typename ActionT>
auto sink(ActionT&& action)
  -> sink_t<estd::decay_t<ActionT> >
{
  return sink_t<estd::decay_t<ActionT> > {
    std::forward<ActionT>(action) };
}

} // namespace xform
} // namespace atria