concepts.hpp

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

#include <atria/meta/concept.hpp>
#include <atria/meta/value_type.hpp>
#include <atria/estd/type_traits.hpp>
#include <utility>
#include <cassert>

namespace atria {
namespace funken {

template <typename T>
auto declval_() -> typename std::add_rvalue_reference<T>::type
{
  assert(!"You should never run this function!");
  return *static_cast<estd::decay_t<T>*>(nullptr);
}

ABL_CONCEPT_SPEC(In_value)
{
  template <typename T,
            typename V = meta::value_t<T> >
  auto requires_(T&& x, V& v = declval_<V&>()) -> decltype(
    meta::expressions(
      v = x.get(),
      v = static_cast<const T&&>(x).get()));
};

ABL_CONCEPT_SPEC(Out_value)
{
  template <typename T,
            typename V = meta::value_t<T> >
  auto requires_(T&& x, V& v = declval_<V&>()) -> decltype(
    meta::expressions(
      (x.set(v), meta::can_be_void),
      (x.set(static_cast<const V&&>(v)), meta::can_be_void)));
};

ABL_CONCEPT_SPEC(Inout_value)
{
  template <typename T>
  auto requires_(T&& x) -> decltype(
    meta::expressions(
      meta::require<(In_value<T>())>(),
      meta::require<(Out_value<T>())>()));
};

ABL_CONCEPT_SPEC(Root_value)
{
  template <typename T>
  auto requires_(T&& x) -> decltype(
    meta::expressions(
      (commit(x), meta::can_be_void)));
};

} // namespace funken
} // namespace atria