ceph/src/boost/boost/hana/detail/variadic/foldr1.hpp

   1 /*!
   2 @file
   3 Defines `boost::hana::detail::variadic::foldr1`.
   4
   5 @copyright Louis Dionne 2013-2017
   6 Distributed under the Boost Software License, Version 1.0.
   7 (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
   8  */
   9
  10 #ifndef BOOST_HANA_DETAIL_VARIADIC_FOLDR1_HPP
  11 #define BOOST_HANA_DETAIL_VARIADIC_FOLDR1_HPP
  12
  13 #include <boost/hana/config.hpp>
  14 #include <boost/hana/core/when.hpp>
  15
  16
  17 BOOST_HANA_NAMESPACE_BEGIN namespace detail { namespace variadic {
  18     //! @cond
  19     template <unsigned int n, typename = when<true>>
  20     struct foldr1_impl;
  21
  22     template <>
  23     struct foldr1_impl<1> {
  24         template <typename F, typename X1>
  25         static constexpr X1 apply(F&&, X1&& x1)
  26         { return static_cast<X1&&>(x1); }
  27     };
  28
  29     template <>
  30     struct foldr1_impl<2> {
  31         template <typename F, typename X1, typename X2>
  32         static constexpr decltype(auto) apply(F&& f, X1&& x1, X2&& x2) {
  33             return static_cast<F&&>(f)(static_cast<X1&&>(x1),
  34                                        static_cast<X2&&>(x2));
  35         }
  36     };
  37
  38     template <>
  39     struct foldr1_impl<3> {
  40         template <typename F, typename X1, typename X2, typename X3>
  41         static constexpr decltype(auto) apply(F&& f, X1&& x1, X2&& x2, X3&& x3) {
  42             return f(static_cast<X1&&>(x1),
  43                    f(static_cast<X2&&>(x2),
  44                      static_cast<X3&&>(x3)));
  45         }
  46     };
  47
  48     template <>
  49     struct foldr1_impl<4> {
  50         template <typename F, typename X1, typename X2, typename X3, typename X4>
  51         static constexpr decltype(auto) apply(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4) {
  52             return f(static_cast<X1&&>(x1),
  53                    f(static_cast<X2&&>(x2),
  54                    f(static_cast<X3&&>(x3),
  55                      static_cast<X4&&>(x4))));
  56         }
  57     };
  58
  59     template <>
  60     struct foldr1_impl<5> {
  61         template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5>
  62         static constexpr decltype(auto) apply(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5) {
  63             return f(static_cast<X1&&>(x1),
  64                    f(static_cast<X2&&>(x2),
  65                    f(static_cast<X3&&>(x3),
  66                    f(static_cast<X4&&>(x4),
  67                      static_cast<X5&&>(x5)))));
  68         }
  69     };
  70
  71     template <>
  72     struct foldr1_impl<6> {
  73         template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5, typename X6>
  74         static constexpr decltype(auto) apply(F&& f, X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5, X6&& x6) {
  75             return f(static_cast<X1&&>(x1),
  76                    f(static_cast<X2&&>(x2),
  77                    f(static_cast<X3&&>(x3),
  78                    f(static_cast<X4&&>(x4),
  79                    f(static_cast<X5&&>(x5),
  80                      static_cast<X6&&>(x6))))));
  81         }
  82     };
  83
  84     template <unsigned int n>
  85     struct foldr1_impl<n, when<(n >= 7) && (n < 14)>> {
  86         template <typename F, typename X1, typename X2, typename X3, typename X4, typename X5, typename X6, typename X7, typename ...Xn>
  87         static constexpr decltype(auto)
  88         apply(F&& f
  89               , X1&& x1, X2&& x2, X3&& x3, X4&& x4, X5&& x5, X6&& x6, X7&& x7
  90               , Xn&& ...xn)
  91         {
  92             return f(static_cast<X1&&>(x1),
  93                    f(static_cast<X2&&>(x2),
  94                    f(static_cast<X3&&>(x3),
  95                    f(static_cast<X4&&>(x4),
  96                    f(static_cast<X5&&>(x5),
  97                    f(static_cast<X6&&>(x6),
  98                      foldr1_impl<sizeof...(xn) + 1>::apply(f, static_cast<X7&&>(x7), static_cast<Xn&&>(xn)...)))))));
  99         }
 100     };
 101
 102     template <unsigned int n>
 103     struct foldr1_impl<n, when<(n >= 14) && (n < 28)>> {
 104         template <
 105               typename F
 106             , typename X1, typename X2, typename X3,  typename X4,  typename X5,  typename X6,  typename X7
 107             , typename X8, typename X9, typename X10, typename X11, typename X12, typename X13, typename X14
 108             , typename ...Xn
 109         >
 110         static constexpr decltype(auto)
 111         apply(F&& f
 112               , X1&& x1, X2&& x2, X3&& x3,   X4&& x4,   X5&& x5,   X6&& x6,   X7&& x7
 113               , X8&& x8, X9&& x9, X10&& x10, X11&& x11, X12&& x12, X13&& x13, X14&& x14
 114               , Xn&& ...xn)
 115         {
 116             return f(static_cast<X1&&>(x1), f(static_cast<X2&&>(x2), f(static_cast<X3&&>(x3),   f(static_cast<X4&&>(x4),   f(static_cast<X5&&>(x5),   f(static_cast<X6&&>(x6),   f(static_cast<X7&&>(x7),
 117                    f(static_cast<X8&&>(x8), f(static_cast<X9&&>(x9), f(static_cast<X10&&>(x10), f(static_cast<X11&&>(x11), f(static_cast<X12&&>(x12), f(static_cast<X13&&>(x13),
 118                      foldr1_impl<sizeof...(xn) + 1>::apply(f, static_cast<X14&&>(x14), static_cast<Xn&&>(xn)...))))))))))))));
 119         }
 120     };
 121
 122     template <unsigned int n>
 123     struct foldr1_impl<n, when<(n >= 28) && (n < 56)>> {
 124         template <
 125               typename F
 126             , typename X1,  typename X2,  typename X3,  typename X4,  typename X5,  typename X6,  typename X7
 127             , typename X8,  typename X9,  typename X10, typename X11, typename X12, typename X13, typename X14
 128             , typename X15, typename X16, typename X17, typename X18, typename X19, typename X20, typename X21
 129             , typename X22, typename X23, typename X24, typename X25, typename X26, typename X27, typename X28
 130             , typename ...Xn
 131         >
 132         static constexpr decltype(auto)
 133         apply(F&& f
 134               , X1&& x1,   X2&& x2,   X3&& x3,   X4&& x4,   X5&& x5,   X6&& x6,   X7&& x7
 135               , X8&& x8,   X9&& x9,   X10&& x10, X11&& x11, X12&& x12, X13&& x13, X14&& x14
 136               , X15&& x15, X16&& x16, X17&& x17, X18&& x18, X19&& x19, X20&& x20, X21&& x21
 137               , X22&& x22, X23&& x23, X24&& x24, X25&& x25, X26&& x26, X27&& x27, X28&& x28
 138               , Xn&& ...xn)
 139         {
 140             return f(static_cast<X1&&>(x1),   f(static_cast<X2&&>(x2),   f(static_cast<X3&&>(x3),   f(static_cast<X4&&>(x4),   f(static_cast<X5&&>(x5),   f(static_cast<X6&&>(x6),   f(static_cast<X7&&>(x7),
 141                    f(static_cast<X8&&>(x8),   f(static_cast<X9&&>(x9),   f(static_cast<X10&&>(x10), f(static_cast<X11&&>(x11), f(static_cast<X12&&>(x12), f(static_cast<X13&&>(x13), f(static_cast<X14&&>(x14),
 142                    f(static_cast<X15&&>(x15), f(static_cast<X16&&>(x16), f(static_cast<X17&&>(x17), f(static_cast<X18&&>(x18), f(static_cast<X19&&>(x19), f(static_cast<X20&&>(x20), f(static_cast<X21&&>(x21),
 143                    f(static_cast<X22&&>(x22), f(static_cast<X23&&>(x23), f(static_cast<X24&&>(x24), f(static_cast<X25&&>(x25), f(static_cast<X26&&>(x26), f(static_cast<X27&&>(x27),
 144                      foldr1_impl<sizeof...(xn) + 1>::apply(f, static_cast<X28&&>(x28), static_cast<Xn&&>(xn)...))))))))))))))))))))))))))));
 145         }
 146     };
 147
 148     template <unsigned int n>
 149     struct foldr1_impl<n, when<(n >= 56)>> {
 150         template <
 151               typename F
 152             , typename X1,  typename X2,  typename X3,  typename X4,  typename X5,  typename X6,  typename X7
 153             , typename X8,  typename X9,  typename X10, typename X11, typename X12, typename X13, typename X14
 154             , typename X15, typename X16, typename X17, typename X18, typename X19, typename X20, typename X21
 155             , typename X22, typename X23, typename X24, typename X25, typename X26, typename X27, typename X28
 156             , typename X29, typename X30, typename X31, typename X32, typename X33, typename X34, typename X35
 157             , typename X36, typename X37, typename X38, typename X39, typename X40, typename X41, typename X42
 158             , typename X43, typename X44, typename X45, typename X46, typename X47, typename X48, typename X49
 159             , typename X50, typename X51, typename X52, typename X53, typename X54, typename X55, typename X56
 160             , typename ...Xn
 161         >
 162         static constexpr decltype(auto)
 163         apply(F&& f
 164               , X1&& x1,   X2&& x2,   X3&& x3,   X4&& x4,   X5&& x5,   X6&& x6,   X7&& x7
 165               , X8&& x8,   X9&& x9,   X10&& x10, X11&& x11, X12&& x12, X13&& x13, X14&& x14
 166               , X15&& x15, X16&& x16, X17&& x17, X18&& x18, X19&& x19, X20&& x20, X21&& x21
 167               , X22&& x22, X23&& x23, X24&& x24, X25&& x25, X26&& x26, X27&& x27, X28&& x28
 168               , X29&& x29, X30&& x30, X31&& x31, X32&& x32, X33&& x33, X34&& x34, X35&& x35
 169               , X36&& x36, X37&& x37, X38&& x38, X39&& x39, X40&& x40, X41&& x41, X42&& x42
 170               , X43&& x43, X44&& x44, X45&& x45, X46&& x46, X47&& x47, X48&& x48, X49&& x49
 171               , X50&& x50, X51&& x51, X52&& x52, X53&& x53, X54&& x54, X55&& x55, X56&& x56
 172               , Xn&& ...xn)
 173         {
 174             return f(static_cast<X1&&>(x1),   f(static_cast<X2&&>(x2),   f(static_cast<X3&&>(x3),   f(static_cast<X4&&>(x4),   f(static_cast<X5&&>(x5),   f(static_cast<X6&&>(x6),   f(static_cast<X7&&>(x7),
 175                    f(static_cast<X8&&>(x8),   f(static_cast<X9&&>(x9),   f(static_cast<X10&&>(x10), f(static_cast<X11&&>(x11), f(static_cast<X12&&>(x12), f(static_cast<X13&&>(x13), f(static_cast<X14&&>(x14),
 176                    f(static_cast<X15&&>(x15), f(static_cast<X16&&>(x16), f(static_cast<X17&&>(x17), f(static_cast<X18&&>(x18), f(static_cast<X19&&>(x19), f(static_cast<X20&&>(x20), f(static_cast<X21&&>(x21),
 177                    f(static_cast<X22&&>(x22), f(static_cast<X23&&>(x23), f(static_cast<X24&&>(x24), f(static_cast<X25&&>(x25), f(static_cast<X26&&>(x26), f(static_cast<X27&&>(x27), f(static_cast<X28&&>(x28),
 178                    f(static_cast<X29&&>(x29), f(static_cast<X30&&>(x30), f(static_cast<X31&&>(x31), f(static_cast<X32&&>(x32), f(static_cast<X33&&>(x33), f(static_cast<X34&&>(x34), f(static_cast<X35&&>(x35),
 179                    f(static_cast<X36&&>(x36), f(static_cast<X37&&>(x37), f(static_cast<X38&&>(x38), f(static_cast<X39&&>(x39), f(static_cast<X40&&>(x40), f(static_cast<X41&&>(x41), f(static_cast<X42&&>(x42),
 180                    f(static_cast<X43&&>(x43), f(static_cast<X44&&>(x44), f(static_cast<X45&&>(x45), f(static_cast<X46&&>(x46), f(static_cast<X47&&>(x47), f(static_cast<X48&&>(x48), f(static_cast<X49&&>(x49),
 181                    f(static_cast<X50&&>(x50), f(static_cast<X51&&>(x51), f(static_cast<X52&&>(x52), f(static_cast<X53&&>(x53), f(static_cast<X54&&>(x54), f(static_cast<X55&&>(x55),
 182                      foldr1_impl<sizeof...(xn) + 1>::apply(f, static_cast<X56&&>(x56), static_cast<Xn&&>(xn)...))))))))))))))))))))))))))))))))))))))))))))))))))))))));
 183         }
 184     };
 185     //! @endcond
 186
 187     struct foldr1_t {
 188         template <typename F, typename X1, typename ...Xn>
 189         constexpr decltype(auto) operator()(F&& f, X1&& x1, Xn&& ...xn) const {
 190             return foldr1_impl<sizeof...(xn) + 1>::apply(
 191                 static_cast<F&&>(f), static_cast<X1&&>(x1), static_cast<Xn&&>(xn)...
 192             );
 193         }
 194     };
 195
 196     constexpr foldr1_t foldr1{};
 197
 198     struct foldr_t {
 199         template <typename F, typename State, typename ...Xn>
 200         constexpr decltype(auto) operator()(F&& f, State&& state, Xn&& ...xn) const {
 201             return foldr1_impl<sizeof...(xn) + 1>::apply(
 202                 static_cast<F&&>(f), static_cast<Xn&&>(xn)..., static_cast<State&&>(state)
 203             );
 204         }
 205     };
 206
 207     constexpr foldr_t foldr{};
 208 }} BOOST_HANA_NAMESPACE_END
 209
 210 #endif // !BOOST_HANA_DETAIL_VARIADIC_FOLDR1_HPP