/usr/include/range/v3/utility/semiregular.hpp is in librange-v3-dev 0.3.5-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 | /// \file
// Range v3 library
//
// Copyright Eric Niebler 2013-present
//
// Use, modification and distribution is subject to the
// Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
// Project home: https://github.com/ericniebler/range-v3
//
#ifndef RANGES_V3_UTILITY_SEMIREGULAR_HPP
#define RANGES_V3_UTILITY_SEMIREGULAR_HPP
#include <utility>
#include <meta/meta.hpp>
#include <range/v3/range_fwd.hpp>
#include <range/v3/utility/get.hpp>
#include <range/v3/utility/optional.hpp>
namespace ranges
{
inline namespace v3
{
/// \addtogroup group-utility
/// @{
/// \cond
namespace detail
{
template<typename T>
struct semiregular_move_assign
: optional<T>
{
using optional<T>::optional;
semiregular_move_assign() = default;
semiregular_move_assign(semiregular_move_assign const &) = default;
semiregular_move_assign(semiregular_move_assign &&) = default;
semiregular_move_assign &operator=(semiregular_move_assign const &) = default;
RANGES_CXX14_CONSTEXPR
semiregular_move_assign &operator=(semiregular_move_assign &&that)
noexcept(std::is_nothrow_move_constructible<T>::value)
{
this->reset();
if (that)
this->emplace(detail::move(*that));
return *this;
}
};
template<typename T>
using semiregular_move_layer =
meta::if_<Movable<T>, optional<T>, semiregular_move_assign<T>>;
template<typename T>
struct semiregular_copy_assign
: semiregular_move_layer<T>
{
using semiregular_move_layer<T>::semiregular_move_layer;
semiregular_copy_assign() = default;
semiregular_copy_assign(semiregular_copy_assign const &) = default;
semiregular_copy_assign(semiregular_copy_assign &&) = default;
RANGES_CXX14_CONSTEXPR
semiregular_copy_assign &operator=(semiregular_copy_assign const &that)
noexcept(std::is_nothrow_copy_constructible<T>::value)
{
this->reset();
if (that)
this->emplace(*that);
return *this;
}
semiregular_copy_assign &operator=(semiregular_copy_assign &&) = default;
};
template<typename T>
using semiregular_copy_layer =
meta::if_<Copyable<T>, optional<T>, semiregular_copy_assign<T>>;
} // namespace detail
/// \endcond
template<typename T>
struct semiregular
: detail::semiregular_copy_layer<T>
{
using detail::semiregular_copy_layer<T>::semiregular_copy_layer;
constexpr semiregular()
noexcept(std::is_nothrow_default_constructible<T>::value ||
!std::is_default_constructible<T>::value)
: semiregular(tag{}, std::is_default_constructible<T>{})
{}
RANGES_CXX14_CONSTEXPR T &get() & noexcept
{
return **this;
}
constexpr T const &get() const & noexcept
{
return **this;
}
RANGES_CXX14_CONSTEXPR T &&get() && noexcept
{
return *detail::move(*this);
}
constexpr T const &&get() const && noexcept
{
return *detail::move(*this);
}
RANGES_CXX14_CONSTEXPR operator T &() & noexcept
{
return **this;
}
constexpr operator T const &() const & noexcept
{
return **this;
}
RANGES_CXX14_CONSTEXPR operator T &&() && noexcept
{
return *detail::move(*this);
}
constexpr operator T const &&() const && noexcept
{
return *detail::move(*this);
}
template<typename...Args>
RANGES_CXX14_CONSTEXPR auto operator()(Args &&...args) &
RANGES_DECLTYPE_NOEXCEPT(std::declval<T &>()(static_cast<Args &&>(args)...))
{
return (**this)(static_cast<Args&&>(args)...);
}
template<typename...Args>
constexpr auto operator()(Args &&...args) const &
RANGES_DECLTYPE_NOEXCEPT(std::declval<T const &>()(static_cast<Args &&>(args)...))
{
return (**this)(static_cast<Args&&>(args)...);
}
template<typename...Args>
RANGES_CXX14_CONSTEXPR auto operator()(Args &&...args) &&
RANGES_DECLTYPE_NOEXCEPT(std::declval<T &&>()(static_cast<Args &&>(args)...))
{
return (*detail::move(*this))(static_cast<Args&&>(args)...);
}
template<typename...Args>
constexpr auto operator()(Args &&...args) const &&
RANGES_DECLTYPE_NOEXCEPT(std::declval<T const &&>()(static_cast<Args &&>(args)...))
{
return (*detail::move(*this))(static_cast<Args&&>(args)...);
}
private:
struct tag {};
constexpr semiregular(tag, std::false_type) noexcept
{}
constexpr semiregular(tag, std::true_type)
noexcept(std::is_nothrow_default_constructible<T>::value)
: detail::semiregular_copy_layer<T>{in_place}
{}
};
template<typename T>
struct semiregular<T &>
: private ranges::reference_wrapper<T &>
{
semiregular() = default;
template<typename Arg,
CONCEPT_REQUIRES_(Constructible<ranges::reference_wrapper<T &>, Arg &>())>
semiregular(in_place_t, Arg &arg)
: ranges::reference_wrapper<T &>(arg)
{}
using ranges::reference_wrapper<T &>::reference_wrapper;
using ranges::reference_wrapper<T &>::get;
using ranges::reference_wrapper<T &>::operator T &;
using ranges::reference_wrapper<T &>::operator();
};
template<typename T>
struct semiregular<T &&>
: private ranges::reference_wrapper<T &&>
{
semiregular() = default;
template<typename Arg,
CONCEPT_REQUIRES_(Constructible<ranges::reference_wrapper<T &&>, Arg>())>
semiregular(in_place_t, Arg &&arg)
: ranges::reference_wrapper<T &>(static_cast<Arg &&>(arg))
{}
using ranges::reference_wrapper<T &&>::reference_wrapper;
using ranges::reference_wrapper<T &&>::get;
using ranges::reference_wrapper<T &&>::operator T &&;
using ranges::reference_wrapper<T &&>::operator();
};
template<typename T>
using semiregular_t =
meta::if_<SemiRegular<T>, T, semiregular<T>>;
template<typename T>
using movesemiregular_t =
meta::if_c<
Movable<T>() && DefaultConstructible<T>(),
T,
semiregular<T>>;
template<typename T, bool IsConst = false>
using semiregular_ref_or_val_t =
meta::if_<
SemiRegular<T>,
meta::if_c<IsConst, T, reference_wrapper<T>>,
reference_wrapper<meta::if_c<IsConst, semiregular<T> const, semiregular<T>>>>;
template<typename T>
auto get(meta::id_t<semiregular<T>> &t)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
t.get()
)
template<typename T>
auto get(meta::id_t<semiregular<T>> const &t)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
t.get()
)
template<typename T>
auto get(meta::id_t<semiregular<T>> &&t)
RANGES_DECLTYPE_AUTO_RETURN_NOEXCEPT
(
detail::move(t).get()
)
/// @}
}
}
#endif
|