synth_access_traits.hpp
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// -*- 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
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// version.
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// General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
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// 3.1, as published by the Free Software Foundation.
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// a copy of the GCC Runtime Library Exception along with this program;
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// 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
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/**
* @file pat_trie_/synth_access_traits.hpp
* Contains an implementation class for a patricia tree.
*/
#ifndef PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
#define PB_DS_SYNTH_E_ACCESS_TRAITS_HPP
#include <ext/pb_ds/detail/type_utils.hpp>
namespace __gnu_pbds
{
namespace detail
{
#define PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC \
template<typename Type_Traits, bool Set, typename _ATraits>
#define PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC \
synth_access_traits<Type_Traits, Set, _ATraits>
/// Synthetic element access traits.
template<typename Type_Traits, bool Set, typename _ATraits>
struct synth_access_traits : public _ATraits
{
typedef _ATraits base_type;
typedef typename base_type::const_iterator const_iterator;
typedef Type_Traits type_traits;
typedef typename type_traits::const_reference const_reference;
typedef typename type_traits::key_const_reference key_const_reference;
synth_access_traits();
synth_access_traits(const base_type&);
inline bool
equal_prefixes(const_iterator, const_iterator, const_iterator,
const_iterator, bool compare_after = true) const;
bool
equal_keys(key_const_reference, key_const_reference) const;
bool
cmp_prefixes(const_iterator, const_iterator, const_iterator,
const_iterator, bool compare_after = false) const;
bool
cmp_keys(key_const_reference, key_const_reference) const;
inline static key_const_reference
extract_key(const_reference);
#ifdef _GLIBCXX_DEBUG
bool
operator()(key_const_reference, key_const_reference);
#endif
private:
inline static key_const_reference
extract_key(const_reference, true_type);
inline static key_const_reference
extract_key(const_reference, false_type);
static integral_constant<int, Set> s_set_ind;
};
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
integral_constant<int,Set>
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::s_set_ind;
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
synth_access_traits()
{ }
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
synth_access_traits(const _ATraits& r_traits)
: _ATraits(r_traits)
{ }
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
inline bool
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
equal_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
const_iterator e_r, bool compare_after /*= false */) const
{
while (b_l != e_l)
{
if (b_r == e_r)
return false;
if (base_type::e_pos(*b_l) != base_type::e_pos(*b_r))
return false;
++b_l;
++b_r;
}
return (!compare_after || b_r == e_r);
}
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
bool
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
equal_keys(key_const_reference r_lhs_key,
key_const_reference r_rhs_key) const
{
return equal_prefixes(base_type::begin(r_lhs_key),
base_type::end(r_lhs_key),
base_type::begin(r_rhs_key),
base_type::end(r_rhs_key),
true);
}
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
bool
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
cmp_prefixes(const_iterator b_l, const_iterator e_l, const_iterator b_r,
const_iterator e_r, bool compare_after /* = false*/) const
{
while (b_l != e_l)
{
if (b_r == e_r)
return false;
const typename base_type::size_type l_pos = base_type::e_pos(*b_l);
const typename base_type::size_type r_pos = base_type::e_pos(*b_r);
if (l_pos != r_pos)
return l_pos < r_pos;
++b_l;
++b_r;
}
if (!compare_after)
return false;
return b_r != e_r;
}
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
bool
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
cmp_keys(key_const_reference r_lhs_key,
key_const_reference r_rhs_key) const
{
return cmp_prefixes(base_type::begin(r_lhs_key),
base_type::end(r_lhs_key),
base_type::begin(r_rhs_key),
base_type::end(r_rhs_key),
true);
}
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
extract_key(const_reference r_val)
{ return extract_key(r_val, s_set_ind); }
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
extract_key(const_reference r_val, true_type)
{ return r_val; }
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
inline typename PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::key_const_reference
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
extract_key(const_reference r_val, false_type)
{ return r_val.first; }
#ifdef _GLIBCXX_DEBUG
PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
bool
PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC::
operator()(key_const_reference r_lhs, key_const_reference r_rhs)
{ return cmp_keys(r_lhs, r_rhs); }
#endif
#undef PB_DS_SYNTH_E_ACCESS_TRAITS_T_DEC
#undef PB_DS_SYNTH_E_ACCESS_TRAITS_C_DEC
} // namespace detail
} // namespace __gnu_pbds
#endif
type_utils.hpp
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::end
_Tp * end(valarray< _Tp > &__va) noexcept
Return an iterator pointing to one past the last element of the valarray.
Definition: valarray:1237
std::begin
_Tp * begin(valarray< _Tp > &__va) noexcept
Return an iterator pointing to the first element of the valarray.
Definition: valarray:1215
__gnu_pbds
GNU extensions for policy-based data structures for public use.
Definition: assoc_container.hpp:52
__gnu_pbds::detail::synth_access_traits
Synthetic element access traits.
Definition: synth_access_traits.hpp:60