copy_traits.hpp

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//
// Copyright (C) 2014, 2015 Ableton AG, Berlin. All rights reserved.
//
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// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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#pragma once

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

namespace atria {
namespace meta {

template <template<typename> class TraitCheckMF,
          template<typename> class TraitAddMf,
          typename OrigT,
          typename DestT>
struct copy_trait
  : std::conditional<
  TraitCheckMF<OrigT>{},
    typename TraitAddMf<DestT>::type,
    DestT>
{};

#define ABL_DEFINE_COPY_STD_TRAIT(name__)       \
  template <typename OrigT, typename DestT>     \
  struct copy_ ## name__                        \
    : copy_trait<::std::is_ ## name__,          \
                 ::std::add_ ## name__,         \
                 OrigT,                         \
                 DestT>                         \
  {};                                           \
  ABL_METAFUNCTION_T(copy_ ## name__);          \
  

ABL_DEFINE_COPY_STD_TRAIT(lvalue_reference);
ABL_DEFINE_COPY_STD_TRAIT(rvalue_reference);
ABL_DEFINE_COPY_STD_TRAIT(volatile);
ABL_DEFINE_COPY_STD_TRAIT(const);

template <typename OrigT, typename DestT>
struct copy_cv
  : copy_const<OrigT, copy_volatile_t<OrigT, DestT> >
{};
ABL_METAFUNCTION_T(copy_cv);

template <typename OrigT, typename DestT>
struct copy_reference
  : copy_lvalue_reference<OrigT, copy_rvalue_reference_t<OrigT, DestT> >
{};
ABL_METAFUNCTION_T(copy_reference);

template <typename OrigT, typename DestT>
struct copy_decay
  : copy_reference<OrigT, copy_cv_t<estd::remove_reference_t<OrigT>, DestT> >
{};
ABL_METAFUNCTION_T(copy_decay);

} // namespace atria
} // namespace atria