detected.hpp

//
// 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/estd/type_traits.hpp>
#include <atria/meta/utils.hpp>
#include <atria/meta/eval.hpp>

namespace atria {
namespace meta {

template <typename D, template<class...> class Op, typename T>
struct lazy_detected_or
{
  template <typename X>
  using operation_t = identity<Op<X> >;
  using type = eval_t<estd::detected_or_t<D, operation_t, T> >;
};

template <typename D, template<class...> class Op, typename T>
using lazy_detected_or_t = eval_t<lazy_detected_or<D, Op, T> >;

template <typename T, template<class...> class... Ops>
struct detected_any;

template <typename T,
          template<class...> class Op>
struct detected_any<T, Op>
{
  using type = estd::detected_t<Op, T>;
};

template <typename T,
          template<class...> class Op,
          template<class...> class... Ops>
struct detected_any<T, Op, Ops...>
{
  using type = lazy_detected_or_t<detected_any<T, Ops...>, Op, T>;
};

template <typename T, template<class...> class... Ops>
using detected_any_t = typename detected_any<T, Ops...>::type;

} // namespace meta
} // namespace xform