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//@HEADER
// ************************************************************************
//
// Kokkos v. 4.0
// Copyright (2022) National Technology & Engineering
// Solutions of Sandia, LLC (NTESS).
//
// Under the terms of Contract DE-NA0003525 with NTESS,
// the U.S. Government retains certain rights in this software.
//
// Part of Kokkos, under the Apache License v2.0 with LLVM Exceptions.
// See https://kokkos.org/LICENSE for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//@HEADER
#pragma once
#include "macros.hpp"
#include "trait_backports.hpp"
#if !defined(MDSPAN_IMPL_USE_ATTRIBUTE_NO_UNIQUE_ADDRESS)
# include "no_unique_address.hpp"
#endif
namespace MDSPAN_IMPL_STANDARD_NAMESPACE {
namespace detail {
// For no unique address emulation, this is the case taken when neither are empty.
// For real `[[no_unique_address]]`, this case is always taken.
template <class T1, class T2, class Enable = void> struct impl_compressed_pair {
MDSPAN_IMPL_NO_UNIQUE_ADDRESS T1 m_t1_val{};
MDSPAN_IMPL_NO_UNIQUE_ADDRESS T2 m_t2_val{};
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T1 &first() noexcept { return m_t1_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr T1 const &first() const noexcept {
return m_t1_val;
}
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T2 &second() noexcept { return m_t2_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr T2 const &second() const noexcept {
return m_t2_val;
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~impl_compressed_pair() = default;
template <class T1Like, class T2Like>
MDSPAN_INLINE_FUNCTION constexpr impl_compressed_pair(T1Like &&t1, T2Like &&t2)
: m_t1_val((T1Like &&) t1), m_t2_val((T2Like &&) t2) {}
};
#if !defined(MDSPAN_IMPL_USE_ATTRIBUTE_NO_UNIQUE_ADDRESS)
// First empty.
template <class T1, class T2>
struct impl_compressed_pair<
T1, T2,
std::enable_if_t<MDSPAN_IMPL_TRAIT(std::is_empty, T1) && !MDSPAN_IMPL_TRAIT(std::is_empty, T2)>>
: private T1 {
T2 m_t2_val{};
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T1 &first() noexcept {
return *static_cast<T1 *>(this);
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr T1 const &first() const noexcept {
return *static_cast<T1 const *>(this);
}
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T2 &second() noexcept { return m_t2_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr T2 const &second() const noexcept {
return m_t2_val;
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~impl_compressed_pair() = default;
template <class T1Like, class T2Like>
MDSPAN_INLINE_FUNCTION constexpr impl_compressed_pair(T1Like &&t1, T2Like &&t2)
: T1((T1Like &&) t1), m_t2_val((T2Like &&) t2) {}
};
// Second empty.
template <class T1, class T2>
struct impl_compressed_pair<
T1, T2,
std::enable_if_t<!MDSPAN_IMPL_TRAIT(std::is_empty, T1) && MDSPAN_IMPL_TRAIT(std::is_empty, T2)>>
: private T2 {
T1 m_t1_val{};
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T1 &first() noexcept { return m_t1_val; }
MDSPAN_FORCE_INLINE_FUNCTION constexpr T1 const &first() const noexcept {
return m_t1_val;
}
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T2 &second() noexcept {
return *static_cast<T2 *>(this);
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr T2 const &second() const noexcept {
return *static_cast<T2 const *>(this);
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~impl_compressed_pair() = default;
template <class T1Like, class T2Like>
MDSPAN_INLINE_FUNCTION constexpr impl_compressed_pair(T1Like &&t1, T2Like &&t2)
: T2((T2Like &&) t2), m_t1_val((T1Like &&) t1) {}
};
// Both empty.
template <class T1, class T2>
struct impl_compressed_pair<
T1, T2,
std::enable_if_t<MDSPAN_IMPL_TRAIT(std::is_empty, T1) && MDSPAN_IMPL_TRAIT(std::is_empty, T2)>>
// We need to use the no_unique_address_emulation wrapper here to avoid
// base class ambiguities.
#ifdef MDSPAN_IMPL_COMPILER_MSVC
// MSVC doesn't allow you to access public static member functions of a type
// when you *happen* to privately inherit from that type.
: protected no_unique_address_emulation<T1, 0>,
protected no_unique_address_emulation<T2, 1>
#else
: private no_unique_address_emulation<T1, 0>,
private no_unique_address_emulation<T2, 1>
#endif
{
using first_base_t = no_unique_address_emulation<T1, 0>;
using second_base_t = no_unique_address_emulation<T2, 1>;
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T1 &first() noexcept {
return this->first_base_t::ref();
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr T1 const &first() const noexcept {
return this->first_base_t::ref();
}
MDSPAN_FORCE_INLINE_FUNCTION MDSPAN_IMPL_CONSTEXPR_14 T2 &second() noexcept {
return this->second_base_t::ref();
}
MDSPAN_FORCE_INLINE_FUNCTION constexpr T2 const &second() const noexcept {
return this->second_base_t::ref();
}
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair() = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
constexpr impl_compressed_pair(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair const &) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
MDSPAN_IMPL_CONSTEXPR_14_DEFAULTED impl_compressed_pair &
operator=(impl_compressed_pair &&) = default;
MDSPAN_INLINE_FUNCTION_DEFAULTED
~impl_compressed_pair() = default;
template <class T1Like, class T2Like>
MDSPAN_INLINE_FUNCTION constexpr impl_compressed_pair(T1Like &&t1, T2Like &&t2) noexcept
: first_base_t(T1((T1Like &&) t1)),
second_base_t(T2((T2Like &&) t2))
{ }
};
#endif // !defined(MDSPAN_IMPL_USE_ATTRIBUTE_NO_UNIQUE_ADDRESS)
} // end namespace detail
} // end namespace MDSPAN_IMPL_STANDARD_NAMESPACE
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