utils.hpp

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//
// Copyright (C) 2014, 2015 Ableton AG, Berlin. All rights reserved.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// 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.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//

#pragma once

namespace atria {
namespace meta {

template <typename T>
struct identity
{
  using type = T;
};

struct bottom
{
  template <typename T> operator T&&() const;
  template <typename T> operator T&() const;
  template <typename T> operator const T&() const;
};

struct from_void {};

constexpr struct noop_t
{
  template <typename ...Args>
  void operator() (Args&&...) const {}
} noop {};

constexpr int can_be_void = 42;

#define ABL_DECLTYPE_RETURN(body_expr)  \
  decltype(body_expr) { return (body_expr); }


#if ABL_CXX14

#define ABL_FORWARD(x) std::forward<decltype(x)>(x)
#endif // ABL_CXX14

} // namespace meta
} // namespace atria