////////////////////////////////////////////////////////////////////////////////
// The Loki Library
// Copyright (c) 2001 by Andrei Alexandrescu
// This code accompanies the book:
// Alexandrescu, Andrei. "Modern C++ Design: Generic Programming and Design
// Patterns Applied". Copyright (c) 2001. Addison-Wesley.
// Permission to use, copy, modify, distribute and sell this software for any
// purpose is hereby granted without fee, provided that the above copyright
// notice appear in all copies and that both that copyright notice and this
// permission notice appear in supporting documentation.
// The author or Addison-Wesley Longman make no representations about the
// suitability of this software for any purpose. It is provided "as is"
// without express or implied warranty.
////////////////////////////////////////////////////////////////////////////////
#ifndef LOKI_ASSOCVECTOR_INC_
#define LOKI_ASSOCVECTOR_INC_
// $Id: AssocVector.h 765 2006-10-18 13:55:32Z syntheticpp $
#include <algorithm>
#include <functional>
#include <vector>
#include <utility>
namespace Loki
{
////////////////////////////////////////////////////////////////////////////////
// class template AssocVectorCompare
// Used by AssocVector
////////////////////////////////////////////////////////////////////////////////
namespace Private
{
template <class Value, class C>
class AssocVectorCompare : public C
{
typedef std::pair<typename C::first_argument_type, Value>
Data;
typedef typename C::first_argument_type first_argument_type;
public:
AssocVectorCompare()
{}
AssocVectorCompare(const C& src) : C(src)
{}
bool operator()(const first_argument_type& lhs,
const first_argument_type& rhs) const
{ return C::operator()(lhs, rhs); }
bool operator()(const Data& lhs, const Data& rhs) const
{ return operator()(lhs.first, rhs.first); }
bool operator()(const Data& lhs,
const first_argument_type& rhs) const
{ return operator()(lhs.first, rhs); }
bool operator()(const first_argument_type& lhs,
const Data& rhs) const
{ return operator()(lhs, rhs.first); }
};
}
////////////////////////////////////////////////////////////////////////////////
// class template AssocVector
// An associative vector built as a syntactic drop-in replacement for std::map
// BEWARE: AssocVector doesn't respect all map's guarantees, the most important
// being:
// * iterators are invalidated by insert and erase operations
// * the complexity of insert/erase is O(N) not O(log N)
// * value_type is std::pair<K, V> not std::pair<const K, V>
// * iterators are random
////////////////////////////////////////////////////////////////////////////////
template
<
class K,
class V,
class C = std::less<K>,
class A = std::allocator< std::pair<K, V> >
>
class AssocVector
: private std::vector< std::pair<K, V>, A >
, private Private::AssocVectorCompare<V, C>
{
typedef std::vector<std::pair<K, V>, A> Base;
typedef Private::AssocVectorCompare<V, C> MyCompare;
public:
typedef K key_type;
typedef V mapped_type;
typedef typename Base::value_type value_type;
typedef C key_compare;
typedef A allocator_type;
typedef typename A::reference reference;
typedef typename A::const_reference const_reference;
typedef typename Base::iterator iterator;
typedef typename Base::const_iterator const_iterator;
typedef typename Base::size_type size_type;
typedef typename Base::difference_type difference_type;
typedef typename A::pointer pointer;
typedef typename A::const_pointer const_pointer;
typedef typename Base::reverse_iterator reverse_iterator;
typedef typename Base::const_reverse_iterator const_reverse_iterator;
class value_compare
: public std::binary_function<value_type, value_type, bool>
, private key_compare
{
friend class AssocVector;
protected:
value_compare(key_compare pred) : key_compare(pred)
{}
public:
bool operator()(const value_type& lhs, const value_type& rhs) const
{ return key_compare::operator()(lhs.first, rhs.first); }
};
// 23.3.1.1 construct/copy/destroy
explicit AssocVector(const key_compare& comp = key_compare(),
const A& alloc = A())
: Base(alloc), MyCompare(comp)
{}
template <class InputIterator>
AssocVector(InputIterator first, InputIterator last,
const key_compare& comp = key_compare(),
const A& alloc = A())
: Base(first, last, alloc), MyCompare(comp)
{
MyCompare& me = *this;
std::sort(begin(), end(), me);
}
AssocVector& operator=(const AssocVector& rhs)
{
AssocVector(rhs).swap(*this);
return *this;
}
// iterators:
// The following are here because MWCW gets 'using' wrong
iterator begin() { return Base::begin(); }
const_iterator begin() const { return Base::begin(); }
iterator end() { return Base::end(); }
const_iterator end() const { return Base::end(); }
reverse_iterator rbegin() { return Base::rbegin(); }
const_reverse_iterator rbegin() const { return Base::rbegin(); }
reverse_iterator rend() { return Base::rend(); }
const_reverse_iterator rend() const { return Base::rend(); }
// capacity:
bool empty() const { return Base::empty(); }
size_type size() const { return Base::size(); }
size_type max_size() { return Base::max_size(); }
// 23.3.1.2 element access:
mapped_type& operator[](const key_type& key)
{ return insert(value_type(key, mapped_type())).first->second; }
// modifiers:
std::pair<iterator, bool> insert(const value_type& val)
{
bool found(true);
iterator i(lower_bound(val.first));
if (i == end() || this->operator()(val.first, i->first))
{
i = Base::insert(i, val);
found = false;
}
return std::make_pair(i, !found);
}
//Section [23.1.2], Table 69
//http://developer.apple.com/documentation/DeveloperTools/gcc-3.3/libstdc++/23_containers/howto.html#4
iterator insert(iterator pos, const value_type& val)
{
if( (pos == begin() || this->operator()(*(pos-1),val)) &&
(pos == end() || this->operator()(val, *pos)) )
{
return Base::insert(pos, val);
}
return insert(val).first;
}
template <class InputIterator>
void insert(InputIterator first, InputIterator last)
{ for (; first != last; ++first) insert(*first); }
void erase(iterator pos)
{ Base::erase(pos); }
size_type erase(const key_type& k)
{
iterator i(find(k));
if (i == end()) return 0;
erase(i);
return 1;
}
void erase(iterator first, iterator last)
{ Base::erase(first, last); }
void swap(AssocVector& other)
{
Base::swap(other);
MyCompare& me = *this;
MyCompare& rhs = other;
std::swap(me, rhs);
}
void clear()
{ Base::clear(); }
// observers:
key_compare key_comp() const
{ return *this; }
value_compare value_comp() const
{
const key_compare& comp = *this;
return value_compare(comp);
}
// 23.3.1.3 map operations:
iterator find(const key_type& k)
{
iterator i(lower_bound(k));
if (i != end() && this->operator()(k, i->first))
{
i = end();
}
return i;
}
const_iterator find(const key_type& k) const
{
const_iterator i(lower_bound(k));
if (i != end() && this->operator()(k, i->first))
{
i = end();
}
return i;
}
size_type count(const key_type& k) const
{ return find(k) != end(); }
iterator lower_bound(const key_type& k)
{
MyCompare& me = *this;
return std::lower_bound(begin(), end(), k, me);
}
const_iterator lower_bound(const key_type& k) const
{
const MyCompare& me = *this;
return std::lower_bound(begin(), end(), k, me);
}
iterator upper_bound(const key_type& k)
{
MyCompare& me = *this;
return std::upper_bound(begin(), end(), k, me);
}
const_iterator upper_bound(const key_type& k) const
{
const MyCompare& me = *this;
return std::upper_bound(begin(), end(), k, me);
}
std::pair<iterator, iterator> equal_range(const key_type& k)
{
MyCompare& me = *this;
return std::equal_range(begin(), end(), k, me);
}
std::pair<const_iterator, const_iterator> equal_range(
const key_type& k) const
{
const MyCompare& me = *this;
return std::equal_range(begin(), end(), k, me);
}
template <class K1, class V1, class C1, class A1>
friend bool operator==(const AssocVector<K1, V1, C1, A1>& lhs,
const AssocVector<K1, V1, C1, A1>& rhs);
bool operator<(const AssocVector& rhs) const
{
const Base& me = *this;
const Base& yo = rhs;
return me < yo;
}
template <class K1, class V1, class C1, class A1>
friend bool operator!=(const AssocVector<K1, V1, C1, A1>& lhs,
const AssocVector<K1, V1, C1, A1>& rhs);
template <class K1, class V1, class C1, class A1>
friend bool operator>(const AssocVector<K1, V1, C1, A1>& lhs,
const AssocVector<K1, V1, C1, A1>& rhs);
template <class K1, class V1, class C1, class A1>
friend bool operator>=(const AssocVector<K1, V1, C1, A1>& lhs,
const AssocVector<K1, V1, C1, A1>& rhs);
template <class K1, class V1, class C1, class A1>
friend bool operator<=(const AssocVector<K1, V1, C1, A1>& lhs,
const AssocVector<K1, V1, C1, A1>& rhs);
};
template <class K, class V, class C, class A>
inline bool operator==(const AssocVector<K, V, C, A>& lhs,
const AssocVector<K, V, C, A>& rhs)
{
const std::vector<std::pair<K, V>, A>& me = lhs;
return me == rhs;
}
template <class K, class V, class C, class A>
inline bool operator!=(const AssocVector<K, V, C, A>& lhs,
const AssocVector<K, V, C, A>& rhs)
{ return !(lhs == rhs); }
template <class K, class V, class C, class A>
inline bool operator>(const AssocVector<K, V, C, A>& lhs,
const AssocVector<K, V, C, A>& rhs)
{ return rhs < lhs; }
template <class K, class V, class C, class A>
inline bool operator>=(const AssocVector<K, V, C, A>& lhs,
const AssocVector<K, V, C, A>& rhs)
{ return !(lhs < rhs); }
template <class K, class V, class C, class A>
inline bool operator<=(const AssocVector<K, V, C, A>& lhs,
const AssocVector<K, V, C, A>& rhs)
{ return !(rhs < lhs); }
// specialized algorithms:
template <class K, class V, class C, class A>
void swap(AssocVector<K, V, C, A>& lhs, AssocVector<K, V, C, A>& rhs)
{ lhs.swap(rhs); }
} // namespace Loki
#endif // end file guardian
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