abort_reduce.hpp

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//
// Copyright (C) 2014, 2015 Ableton AG, Berlin. All rights reserved.
//
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// Software is furnished to do so, subject to the following conditions:
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#pragma once

#include <atria/xform/state_traits.hpp>
#include <atria/estd/utility.hpp>

#include <ableton/build_system/Warnings.hpp>

#include <exception>
#include <utility>

namespace atria {
namespace xform {
namespace impure {

struct reduce_aborted_error_base : std::exception
{
  const char* what() const noexcept override;
};

template <typename T>
struct reduce_aborted_error : reduce_aborted_error_base
{
  T result;

  template <typename ...Ts>
  reduce_aborted_error(Ts... ts)
    : result{std::move(ts)...}
  {}
};

template <typename StateT>
void abort_reduce(StateT&& state)
{
  using complete_t = estd::decay_t<decltype(state_complete(state))>;
  throw reduce_aborted_error<complete_t> {
    state_complete(std::forward<StateT>(state))
  };
}

template <typename ReducingFnT, typename StateT, typename ...InputTs>
auto abort_reduce(ReducingFnT&& step, StateT&& state, InputTs&& ...ins)
  -> decltype(step(state, ins...))
{
  using complete_t = estd::decay_t<decltype(state_complete(state))>;
  throw reduce_aborted_error<complete_t> {
    state_complete(std::forward<StateT>(state))
  };
}

} // namespace impure
} // namespace xform
} // namespace atria