/usr/include/flint/flintxx/traits.h is in libflint-dev 2.5.2-3.
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 | /*=============================================================================
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_TRAITS_H
#define CXX_TRAITS_H
// only for true_/false_
#include "mp.h"
namespace flint {
namespace detail {
template<class T>
struct wrap
{
T t;
};
} // detail
namespace traits {
///////////////////////
// BASIC TYPE TRAITS
///////////////////////
// These helpers can be used to manipulate and inquire type information.
// For example, given an arbitrary type T, one might be interested in knowing
// if it is an integral type (int, short, ulong, etc).
//
// This file contains generic traits, not specific to FLINT.
using mp::true_;
using mp::false_;
// Compute if T belongs to the signed integer types.
template<class T> struct is_signed_integer : false_ { };
template<> struct is_signed_integer<signed char> : true_ { };
template<> struct is_signed_integer<signed short> : true_ { };
template<> struct is_signed_integer<signed int> : true_ { };
template<> struct is_signed_integer<slong> : true_ { };
// Compute if T belongs to the unsigned integer types.
template<class T> struct is_unsigned_integer : false_ { };
template<> struct is_unsigned_integer<unsigned char> : true_ { };
template<> struct is_unsigned_integer<unsigned short> : true_ { };
template<> struct is_unsigned_integer<unsigned int> : true_ { };
template<> struct is_unsigned_integer<ulong> : true_ { };
// Compute if T belongs to the signed or unsigned integer types
template<class T> struct is_integer
: mp::or_<is_unsigned_integer<T>, is_signed_integer<T> > { };
// Compute if T can always losslessly be converted into an slong
template<class T, class Enable = void> struct fits_into_slong : mp::false_ { };
template<class T>
struct fits_into_slong<T, typename mp::enable_if<traits::is_integer<T> >::type>
: mp::or_<
is_signed_integer<T>,
mp::and_v<
is_unsigned_integer<T>,
sizeof(T) < sizeof(slong)
>
> { };
template<class T> struct fits_into_mp_bitcnt_t : is_unsigned_integer<T> { };
// Compute if T is like const char*
template<class T> struct is_string : mp::false_ { };
template<> struct is_string<char*> : mp::true_ { };
template<> struct is_string<const char*> : mp::true_ { };
template<int n> struct is_string<char[n]> : mp::true_ { };
template<int n> struct is_string<const char[n]> : mp::true_ { };
// Compute a type appropriate for forwarding T. This is just the appropriate
// constant reference type (but avoids things like const (int&)&, which cause
// syntax errors.
template<class T, class E = void> struct forwarding {typedef const T& type;};
template<class T> struct forwarding<T&> {typedef T& type;};
template<class T> struct forwarding<const T&> {typedef const T& type;};
template<class T>
struct forwarding<T, typename mp::enable_if<is_integer<T> >::type>
{
typedef T type;
};
template<class T> struct forwarding<T*> {typedef T* type;};
template<> struct forwarding<bool> {typedef bool type;};
// Compute a type appropriate for referencing. Usually T&.
template<class T> struct reference {typedef T& type;};
template<class T> struct reference<T&> {typedef T& type;};
template<class T> struct reference<const T&> {typedef const T& type;};
// Add a constant qualification. In particular, turn T& into const T&.
template<class T> struct make_const {typedef const T type;};
template<class T> struct make_const<T&> {typedef const T& type;};
// Strip const and reference type annotations. This does *not* strip pointers!
template<class T> struct basetype {typedef T type;};
template<class T> struct basetype<const T> {typedef T type;};
template<class T> struct basetype<T&> {typedef T type;};
template<class T> struct basetype<const T&> {typedef T type;};
struct no { int data[2]; };
typedef int yes;
template<class T> detail::wrap<T> fakeinstance();
// use with care
template<class To, class From>
struct _is_convertible
{
private:
static yes test(...) {return yes();}
static no test(To) {return no();}
public:
static const bool val = (sizeof(test(fakeinstance<From>().t)) != sizeof(yes));
};
// XXX HACK
template<class To, class A, class B>
struct _is_convertible<To, A(B)> : false_ { };
} // traits
} // flint
#endif
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