/usr/include/flint/flintxx/forwarding.h is in libflint-dev 2.5.2-17build1.
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 | /*=============================================================================
This file is part of FLINT.
FLINT is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
FLINT is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with FLINT; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
=============================================================================*/
/******************************************************************************
Copyright (C) 2013 Tom Bachmann
******************************************************************************/
#ifndef CXX_FORWARDING_H
#define CXX_FORWARDING_H
#include <iosfwd>
#include <string>
#include "evaluation_tools.h"
#include "mp.h"
#include "rules.h"
#include "tuple.h"
// XXX This file is UNFINISHED. It is/was meant to use for extending flintxx by
// compisition, in particular for the NTL wrapper.
// Ask Tom (e_mc_h2@web.de) if you want to use it.
namespace flint {
namespace forwarding {
// Specialise this to enable forwarding of your class.
template<class T>
struct enable : mp::false_ { };
} // forwarding
namespace rules {
template<class T>
struct print<T, typename mp::enable_if<traits::is_implemented<
print<typename forwarding::enable<T>::underlying_t> > >::type>
{
static void doit(const T& t, std::ostream& o)
{
typedef typename forwarding::enable<T> et;
print<typename et::underlying_t>::doit(et::get_underlying(t), o);
}
};
template<class T>
struct to_string<T, typename mp::enable_if<traits::is_implemented<
to_string<typename forwarding::enable<T>::underlying_t> > >::type>
{
static std::string get(const T& t, int base)
{
typedef typename forwarding::enable<T> et;
return to_string<typename et::underlying_t>::get(
et::get_underlying(t), base);
}
};
namespace rdetail {
template<class T, class Enable = void>
struct maybe_forward
{
typedef T underlying_t;
static const T& get_underlying(const T& t) {return t;}
static T& get_underlying(T& t) {return t;}
};
template<class T>
struct maybe_forward<T, typename mp::enable_if<forwarding::enable<T> >::type>
: forwarding::enable<T> { };
template<template<class, class, class> class Wrapped, class T, class U>
struct fwd_enable2
: mp::enable_if<mp::and_<
traits::is_implemented<Wrapped<
typename maybe_forward<T>::underlying_t,
typename maybe_forward<U>::underlying_t,
void> >,
mp::or_<
typename forwarding::enable<T>,
typename forwarding::enable<U> > > >
{
typedef Wrapped<
typename maybe_forward<T>::underlying_t,
typename maybe_forward<U>::underlying_t,
void> wrapped_t;
};
} // rdetail
template<class T, class U>
struct assignment<T, U, typename rdetail::fwd_enable2<rules::assignment, T, U>::type>
{
static void doit(T& t, const U& u)
{
rdetail::fwd_enable2<rules::assignment, T, U>::wrapped_t::doit(
rdetail::maybe_forward<T>::get_underlying(t),
rdetail::maybe_forward<U>::get_underlying(u));
}
};
template<class T, class U>
struct cmp<T, U, typename rdetail::fwd_enable2<rules::cmp, T, U>::type>
{
static int get(const T& t, const U& u)
{
return rdetail::fwd_enable2<rules::cmp, T, U>::wrapped_t::get(
rdetail::maybe_forward<T>::get_underlying(t),
rdetail::maybe_forward<U>::get_underlying(u));
}
};
template<class T, class U>
struct equals<T, U, typename rdetail::fwd_enable2<rules::equals, T, U>::type>
{
static bool get(const T& t, const U& u)
{
return rdetail::fwd_enable2<rules::equals, T, U>::wrapped_t::get(
rdetail::maybe_forward<T>::get_underlying(t),
rdetail::maybe_forward<U>::get_underlying(u));
}
};
template<class T, class U>
struct conversion<T, U, typename mp::enable_if<traits::is_implemented<
conversion<T, typename forwarding::enable<U>::underlying_t> > >::type>
{
static T get(const U& u)
{
return conversion<T, typename forwarding::enable<U>::underlying_t>::get(
forwarding::enable<U>::get_underlying(u));
}
};
// TODO automatically convert fwd<U> to fwd<T> ?
// TODO instantiate_temporaries ?
namespace rdetail {
template<class Data>
struct needs_forwarding : mp::false_ { };
template<class Data>
struct needs_forwarding<const Data&> : forwarding::enable<Data> { };
template<class Head, class Tail>
struct needs_forwarding<tuple<Head, Tail> >
: mp::or_<needs_forwarding<Head>, needs_forwarding<Tail> > { };
template<class Data>
struct translate
{
typedef Data type;
static type doit(const Data& d) {return d;}
};
template<class Wrapped>
struct translate<const Wrapped&>
{
typedef maybe_forward<Wrapped> fw;
typedef typename fw::underlying_t type;
static type doit(const Wrapped& d)
{
return fw::get_underlying(d);
}
};
template<class Head, class Tail>
struct translate<tuple<Head, Tail> >
{
typedef translate<Head> htranslator;
typedef translate<Tail> ttranslator;
typedef tuple<typename htranslator::type, typename ttranslator::type> type;
static type doit(const tuple<Head, Tail>& d)
{
return type(htranslator::doit(d.head), ttranslator::doit(d.tail));
}
};
template<class Op, class Data, bool result_is_temporary, class Enable = void>
struct can_forward
{
typedef rdetail::translate<Data> translator;
typedef typename translator::type translated_t;
typedef typename mp::find_evaluation<
Op, translated_t, result_is_temporary>::type rule_t;
static const bool val = traits::is_implemented<rule_t>::val;
};
template<class Op, class Data, bool result_is_temporary>
struct can_forward<Op, Data, result_is_temporary,
typename mp::disable_if<needs_forwarding<Data> >::type>
{
static const bool val = false;
};
}
template<class Op, class Data, bool result_is_temporary>
struct evaluation<Op, Data, result_is_temporary, 1,
typename mp::enable_if<
rdetail::can_forward<Op, Data, result_is_temporary> >::type>
{
typedef rdetail::translate<Data> translator;
typedef typename translator::type translated_t;
typedef typename mp::find_evaluation<
Op, translated_t, result_is_temporary>::type rule_t;
typedef typename rule_t::temporaries_t temporaries_t;
// TODO repackaging
typedef typename rule_t::return_t return_t;
static void doit(const Data& input, temporaries_t temps, return_t* output)
{
rule_t::doit(translator::doit(input), temps, output);
}
};
} //rules
} // flint
#endif
|