type_utils.hpp
Go to the documentation of this file.
// -*- C++ -*-
// Copyright (C) 2005-2021 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library 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 3, or (at your option) any later
// version.
// This library 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.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
// Copyright (C) 2004 Ami Tavory and Vladimir Dreizin, IBM-HRL.
// Permission to use, copy, modify, sell, and distribute this software
// is hereby granted without fee, provided that the above copyright
// notice appears in all copies, and that both that copyright notice
// and this permission notice appear in supporting documentation. None
// of the above authors, nor IBM Haifa Research Laboratories, make any
// representation about the suitability of this software for any
// purpose. It is provided "as is" without express or implied
// warranty.
/**
* @file detail/type_utils.hpp
* Contains utilities for handling types. All of these classes are based on
* Modern C++ by Andrei Alxandrescu.
*/
#ifndef PB_DS_TYPE_UTILS_HPP
#define PB_DS_TYPE_UTILS_HPP
#include <cstddef>
#include <utility>
#include <tr1/type_traits>
#include <ext/type_traits.h>
#include <ext/numeric_traits.h>
namespace __gnu_pbds
{
namespace detail
{
using std::tr1::is_same;
using std::tr1::is_const;
using std::tr1::is_pointer;
using std::tr1::is_reference;
using std::tr1::is_fundamental;
using std::tr1::is_member_object_pointer;
using std::tr1::is_member_pointer;
using std::tr1::is_base_of;
using std::tr1::remove_const;
using std::tr1::remove_reference;
// Need integral_const<bool, true> <-> integral_const<int, 1>, so
// because of this use the following typedefs instead of importing
// std::tr1's.
using std::tr1::integral_constant;
typedef std::tr1::integral_constant<int, 1> true_type;
typedef std::tr1::integral_constant<int, 0> false_type;
using __gnu_cxx::__conditional_type;
using __gnu_cxx::__numeric_traits;
template<typename T>
struct is_const_pointer
{
enum
{
value = is_const<T>::value && is_pointer<T>::value
};
};
template<typename T>
struct is_const_reference
{
enum
{
value = is_const<T>::value && is_reference<T>::value
};
};
template<typename T>
struct is_simple
{
enum
{
value = is_fundamental<typename remove_const<T>::type>::value
|| is_pointer<typename remove_const<T>::type>::value
|| is_member_pointer<T>::value
};
};
template<typename T>
class is_pair
{
private:
template<typename U>
struct is_pair_imp
{
enum
{
value = 0
};
};
template<typename U, typename V>
struct is_pair_imp<std::pair<U,V> >
{
enum
{
value = 1
};
};
public:
enum
{
value = is_pair_imp<T>::value
};
};
// Use C++11's static_assert if possible.
#if __cplusplus >= 201103L
#define PB_DS_STATIC_ASSERT(UNIQUE, E) static_assert(E, #UNIQUE)
#else
template<bool>
struct __static_assert;
template<>
struct __static_assert<true>
{ };
template<int>
struct __static_assert_dumclass
{
enum
{
v = 1
};
};
#define PB_DS_STATIC_ASSERT(UNIQUE, E) \
typedef __gnu_pbds::detail::__static_assert_dumclass<sizeof(__gnu_pbds::detail::__static_assert<bool(E)>)> UNIQUE##__static_assert_type
#endif
template<typename Type>
struct type_to_type
{
typedef Type type;
};
} // namespace detail
} // namespace __gnu_pbds
#endif
cstddef
type_traits.h
std::true_type
integral_constant< bool, true > true_type
The type used as a compile-time boolean with true value.
Definition: type_traits:83
std::false_type
integral_constant< bool, false > false_type
The type used as a compile-time boolean with false value.
Definition: type_traits:86
std
ISO C++ entities toplevel namespace is std.
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition: assoc_container.hpp:52
numeric_traits.h
utility