STL 之 set 源码剖析

G++ 2.91.57，cygnus\cygwin-b20\include\g++\stl_set.h 完整列表
/*
*
* Copyright (c) 1994
* Hewlett-Packard Company
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation 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. Hewlett-Packard Company makes no
* representations about the suitability of this software for any
* purpose.  It is provided "as is" without express or implied warranty.
*
*
* Copyright (c) 1996,1997
* Silicon Graphics Computer Systems, Inc.
*
* Permission to use, copy, modify, distribute and sell this software
* and its documentation 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.  Silicon Graphics makes no
* representations about the suitability of this software for any
* purpose.  It is provided "as is" without express or implied warranty.
*/

/* NOTE: This is an internal header file, included by other STL headers.
* 	You should not attempt to use it directly.
*/

#ifndef    SGI_STL_INTERNAL_SET_H
#define  SGI_STL_INTERNAL_SET_H

  STL_BEGIN_NAMESPACE

#if defined(   sgi) && !defined(   GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma set woff 1174
#endif

#ifndef    STL_LIMITED_DEFAULT_TEMPLATES
template , class Alloc = alloc>
#else
template 
#endif
class set {
public:
// typedefs:
 
typedef Key key_type;
typedef Key value_type;
// 注意，以下 key_compare 和 value_compare 使用相同的比較函式
typedef Compare key_compare;
typedef Compare value_compare;
private:
/* 注意，identity 定義於 ，參見第 7 章，其定義為：
template 
struct identity : public unary_function {
const T& operator()(const T& x) const { return x; }
};
*/
// 以下，rb_tree
typedef rb_tree, key_compare, Alloc> rep_type;
rep_type t; // 採用紅黑樹（RB-tree）來表現  set
public:
typedef typename rep_type::const_pointer pointer; typedef typename rep_type::const_pointer  const_pointer; typedef typename rep_type::const_reference  reference; typedef typename rep_type::const_reference const_reference; typedef typename rep_type::const_iterator  iterator;
// 注意上一行，iterator 定義為 RB-tree 的 const_iterator，這表示  set 的
// 迭代器無法執行寫入動作。這是因為 set 的元素有一定次序安排，
// 不允許使用者在任意處做寫入動作。
typedef typename rep_type::const_iterator const_iterator;
typedef typename rep_type::const_reverse_iterator reverse_iterator; typedef typename rep_type::const_reverse_iterator const_reverse_iterator; typedef typename rep_type::size_type size_type;
typedef typename rep_type::difference_type  difference_type;

// allocation/deallocation
// 注意， set 一定使用 insert_unique() 而不使用 insert_equal()。
// multiset 才使用 insert_equal()。
set() : t(Compare()) {}
explicit set(const Compare& comp) : t(comp) {}

#ifdef   STL_MEMBER_TEMPLATES template  set(InputIterator first, InputIterator last)
: t(Compare()) { t.insert_unique(first, last); }

template 
set(InputIterator first, InputIterator last, const Compare& comp)
: t(comp) { t.insert_unique(first, last); }
#else
set(const value_type* first, const value_type* last)
: t(Compare()) { t.insert_unique(first, last); }
set(const value_type* first, const value_type* last, const Compare& comp)

: t(comp) { t.insert_unique(first, last); }

set(const_iterator first, const_iterator last)
: t(Compare()) { t.insert_unique(first, last); }
set(const_iterator first, const_iterator last, const Compare& comp)
: t(comp) { t.insert_unique(first, last); }
#endif /*    STL_MEMBER_TEMPLATES */

set(const set& x) : t(x.t) {}
set& operator=(const set& x) {
t = x.t;
return *this;
}

// 以下所有的 set 操作行為，RB-tree 都已提供，所以 set 只要轉呼叫即可。

// accessors:
key_compare key_comp() const { return t.key_comp(); }
// 以下注意，set 的 value_comp() 事實上為 RB-tree 的 key_comp()。
value_compare value_comp() const { return t.key_comp(); }
iterator begin() const { return t.begin(); } iterator end() const { return t.end(); } reverse_iterator rbegin() const { return t.rbegin(); } reverse_iterator rend() const { return t.rend(); }
bool empty() const { return t.empty(); } size_type size() const { return t.size(); } size_type max_size() const { return t.max_size(); }
void swap(set& x) { t.swap(x.t); }

// insert/erase
typedef  pair pair_iterator_bool;
pair insert(const value_type& x) {
pair p = t.insert_unique(x);
return pair(p.first, p.second);
}
iterator insert(iterator position, const value_type& x) {
typedef typename rep_type::iterator rep_iterator;
return t.insert_unique((rep_iterator&)position, x);
}
#ifdef   STL_MEMBER_TEMPLATES
template 
void insert(InputIterator first, InputIterator last) {
t.insert_unique(first, last);
}
#else
void insert(const_iterator first, const_iterator last) {
t.insert_unique(first, last);
}
void insert(const value_type* first, const value_type* last) {
 
t.insert_unique(first, last);
}
#endif /*   STL_MEMBER_TEMPLATES */
void erase(iterator position) {
typedef typename rep_type::iterator rep_iterator;
t.erase((rep_iterator&)position);
}
size_type erase(const key_type& x) {
return t.erase(x);
}
void erase(iterator first, iterator last) {
typedef typename rep_type::iterator rep_iterator;
t.erase((rep_iterator&)first,  (rep_iterator&)last);
}
void clear() { t.clear(); }

// set operations:
iterator find(const key_type& x) const { return t.find(x); } size_type count(const key_type& x) const { return t.count(x); } iterator lower_bound(const key_type& x) const {
return t.lower_bound(x);
}
iterator upper_bound(const key_type& x) const {
return t.upper_bound(x);
}
pair equal_range(const key_type& x) const {
return t.equal_range(x);
 
}
friend bool operator==
 

__STL_NULL_TMPL_ARGS (const set&, const set&);
 
friend bool operator<    STL_NULL_TMPL_ARGS (const set&, const set&);
};

template 
inline bool operator==(const set& x, const set& y) {
return x.t == y.t;
}

template 
inline bool operator<(const set& x, const set& y) {
return x.t < y.t;
}

#ifdef    STL_FUNCTION_TMPL_PARTIAL_ORDER

template 
inline void swap(set& x, set& y) {
 
x.swap(y);
}

#endif /*    STL_FUNCTION_TMPL_PARTIAL_ORDER */

#if defined( sgi) && !defined( GNUC__) && (_MIPS_SIM != _MIPS_SIM_ABI32)
#pragma reset woff 1174
#endif

  STL_END_NAMESPACE

#endif /*   SGI_STL_INTERNAL_SET_H */

// Local Variables:
// mode:C++
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