stl_uninitialized.h
来源：互联网 发布：lt18i 预装软件 卸载 编辑：程序博客网 时间：2024/05/02 03:10
stl_uninitialized.h// Filename: stl_uninitialized.h// Comment By: 凝霜// E-mail: mdl2009@vip.qq.com// Blog: http://blog.csdn.net/mdl13412// 主要接口://// template <class InputIterator, class ForwardIterator>// inline ForwardIterator// uninitialized_copy(InputIterator first, InputIterator last,// ForwardIterator result)// 将[first, last)的对象复制一份到[result, result + (last - first))// 对于char和wchar_t提供特化版本, 以获取最佳效率// 注: commit or rollback//// template <class InputIterator, class Size, class ForwardIterator>// inline pair<InputIterator, ForwardIterator>// uninitialized_copy_n(InputIterator first, Size count,// ForwardIterator result)// 从first开始, 复制count个对象到[result, result + n)// 注: commit or rollback//// template <class ForwardIterator, class T>// inline void uninitialized_fill(ForwardIterator first,// ForwardIterator last,// const T& x)// 将x复制到pfirst, last)// 注: commit or rollback//// template <class ForwardIterator, class Size, class T>// inline ForwardIterator uninitialized_fill_n(ForwardIterator first,// Size n, const T& x)// 复制n个x对象到[first, first + n)// 注: commit or rollback/* * * 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_UNINITIALIZED_H#define __SGI_STL_INTERNAL_UNINITIALIZED_H__STL_BEGIN_NAMESPACE////////////////////////////////////////////////////////////////////////////////// uninitialized_copy()实现部分////////////////////////////////////////////////////////////////////////////////// 特化char版本// |---------------> (char *, ...) <--- 字串串专用版本// | 特化wchar_t版本 |--- 调用memmove()// uninitialized_copy ------------------> (wchar_t, ...) <--- 获取最佳效率// |// |// | 泛化 调用 __uninitialized_copy()// |-----> 根据类型是否为POD进行函数派发// |// |---------------- Is POD?// |// -------------------------------------// No | | Yes// ↓ |// __uninitialized_copy_aux(..., __false_type) |// for ( ; first != last; ++first, ++cur) |// construct(&*cur, *first); ↓// __uninitialized_copy_aux(..., __true_type)// copy(first, last, result)////////////////////////////////////////////////////////////////////////////////// 如果copy construction和operator =等效, 并且destructor is trivial// 那么就可以使用本函数// 返回值为目标地址的end// 注: 使用copy()进行复制的时候, 调用的是对象的operator =,// 所以要满足copy construction和operator =等效,// destructor is trivial保证在此版本中不会进行析构,// 以保证效率template <class InputIterator, class ForwardIterator>inline ForwardIterator__uninitialized_copy_aux(InputIterator first, InputIterator last, ForwardIterator result, __true_type){ // 调用的是STL算法copy() return copy(first, last, result);}// 如果copy construction和operator =不等效, 那么就要调用construct()进行构造template <class InputIterator, class ForwardIterator>ForwardIterator__uninitialized_copy_aux(InputIterator first, InputIterator last, ForwardIterator result, __false_type){ ForwardIterator cur = result; __STL_TRY { // 因为copy construction和operator =不等效, // 则必须每个对象都以其它对象为蓝本进行构造 // 本实作中使用的是placement new进行构造 for ( ; first != last; ++first, ++cur) construct(&*cur, *first); return cur; } // commit or rollback // 如果分配失败就stack unwinding, // 保证所有对象都被析构 __STL_UNWIND(destroy(result, cur));}// 派发函数, traits出T是否为POD, 然后进行派发template <class InputIterator, class ForwardIterator, class T>inline ForwardIterator__uninitialized_copy(InputIterator first, InputIterator last, ForwardIterator result, T*){ // POD = Plain Old Data // 其具有trvial constructor/destructor/copy constructor/operator = // 所有的C++内置基本数据类型和传统C struct都属于POD typedef typename __type_traits<T>::is_POD_type is_POD; // 根据是否为POD类型进行派发, 以保证效率 return __uninitialized_copy_aux(first, last, result, is_POD());}template <class InputIterator, class ForwardIterator>inline ForwardIterator uninitialized_copy(InputIterator first, InputIterator last, ForwardIterator result){ // 调用派发函数, 根据是否为POD决议出最佳效率的函数 return __uninitialized_copy(first, last, result, value_type(result));}// 提供给char专用, 效率最优化inline char* uninitialized_copy(const char* first, const char* last, char* result){ memmove(result, first, last - first); return result + (last - first);}// 提供给wchar_t专用, 效率最优化inline wchar_t* uninitialized_copy(const wchar_t* first, const wchar_t* last, wchar_t* result){ memmove(result, first, sizeof(wchar_t) * (last - first)); return result + (last - first);}////////////////////////////////////////////////////////////////////////////////// uninitialized_copy_n()实现部分////////////////////////////////////////////////////////////////////////////////// uninitialized_copy_n// |// |------------ 判断迭代器first的类别// |// -----------------------------------------// InputIterator | | RandomAccessIterator// | |// ↓ |// __uninitialized_copy_n(..., input_iterator_tag) |// for ( ; count > 0 ; --count, ++first, ++cur) |// construct(&*cur, *first); |// ↓// __uninitialized_copy_n(..., random_access_iterator_tag)// last = first + count;// uninitialized_copy(first, last, result)////////////////////////////////////////////////////////////////////////////////// POD版本template <class InputIterator, class Size, class ForwardIterator>pair<InputIterator, ForwardIterator>__uninitialized_copy_n(InputIterator first, Size count, ForwardIterator result, input_iterator_tag){ ForwardIterator cur = result; __STL_TRY { for ( ; count > 0 ; --count, ++first, ++cur) construct(&*cur, *first); return pair<InputIterator, ForwardIterator>(first, cur); } __STL_UNWIND(destroy(result, cur));}// 非POD版本// 对于支持随机存取的迭代器, 可以直接使用uninitialized_copy()进行复制template <class RandomAccessIterator, class Size, class ForwardIterator>inline pair<RandomAccessIterator, ForwardIterator>__uninitialized_copy_n(RandomAccessIterator first, Size count, ForwardIterator result, random_access_iterator_tag){ RandomAccessIterator last = first + count; return make_pair(last, uninitialized_copy(first, last, result));}template <class InputIterator, class Size, class ForwardIterator>inline pair<InputIterator, ForwardIterator>uninitialized_copy_n(InputIterator first, Size count, ForwardIterator result){ return __uninitialized_copy_n(first, count, result, iterator_category(first));}////////////////////////////////////////////////////////////////////////////////// uninitialized_fill()实现部分////////////////////////////////////////////////////////////////////////////////// uninitialized_fill// |// |// ↓// 调用__uninitialized_fill()// 根据类型是否为POD进行函数派发// |// |---------------- Is POD?// No 泛化版本 | Yes 特化版本// -------------------------------------------// | |// | |// ↓ |// __uninitialized_fill_aux(..., __false_type) |// for ( ; cur != last; ++cur) |// construct(&*cur, x); ↓// __uninitialized_fill_aux(..., __true_type)// fill(first, last, x);////////////////////////////////////////////////////////////////////////////////// POD版本// 如果copy construction和operator =等效, 并且destructor is trivial// 那么就可以使用本函数template <class ForwardIterator, class T>inline void__uninitialized_fill_aux(ForwardIterator first, ForwardIterator last, const T& x, __true_type){ fill(first, last, x);}// 非POD版本template <class ForwardIterator, class T>void__uninitialized_fill_aux(ForwardIterator first, ForwardIterator last, const T& x, __false_type){ ForwardIterator cur = first; __STL_TRY { for ( ; cur != last; ++cur) construct(&*cur, x); } __STL_UNWIND(destroy(first, cur));}// 派发函数template <class ForwardIterator, class T, class T1>inline void __uninitialized_fill(ForwardIterator first, ForwardIterator last, const T& x, T1*){ typedef typename __type_traits<T1>::is_POD_type is_POD; __uninitialized_fill_aux(first, last, x, is_POD());}template <class ForwardIterator, class T>inline void uninitialized_fill(ForwardIterator first, ForwardIterator last, const T& x){ __uninitialized_fill(first, last, x, value_type(first));}////////////////////////////////////////////////////////////////////////////////// uninitialized_fill_n()实现部分////////////////////////////////////////////////////////////////////////////////// uninitialized_fill_n// |// |// ↓// 调用__uninitialized_fill_n()// 根据类型是否为POD进行函数派发// |// |---------------- Is POD?// No 泛化版本 | Yes 特化版本// -------------------------------------------// | |// | |// ↓ |// __uninitialized_fill_n_aux(..., __false_type) |// for ( ; n > 0; --n, ++cur) |// construct(&*cur, x); |// ↓// __uninitialized_fill_n_aux(..., __true_type)// fill_n(first, n, x);////////////////////////////////////////////////////////////////////////////////// 如果copy construction和operator =等效, 并且destructor is trivial// 那么就可以使用本函数template <class ForwardIterator, class Size, class T>inline ForwardIterator__uninitialized_fill_n_aux(ForwardIterator first, Size n, const T& x, __true_type){ return fill_n(first, n, x);}template <class ForwardIterator, class Size, class T>ForwardIterator__uninitialized_fill_n_aux(ForwardIterator first, Size n, const T& x, __false_type){ ForwardIterator cur = first; __STL_TRY { for ( ; n > 0; --n, ++cur) construct(&*cur, x); return cur; } __STL_UNWIND(destroy(first, cur));}template <class ForwardIterator, class Size, class T, class T1>inline ForwardIterator __uninitialized_fill_n(ForwardIterator first, Size n, const T& x, T1*){ typedef typename __type_traits<T1>::is_POD_type is_POD; return __uninitialized_fill_n_aux(first, n, x, is_POD());}template <class ForwardIterator, class Size, class T>inline ForwardIterator uninitialized_fill_n(ForwardIterator first, Size n, const T& x){ return __uninitialized_fill_n(first, n, x, value_type(first));}////////////////////////////////////////////////////////////////////////////////// 其它函数实现////////////////////////////////////////////////////////////////////////////////// Copies [first1, last1) into [result, result + (last1 - first1)), and// copies [first2, last2) into// [result, result + (last1 - first1) + (last2 - first2)).// 我认为应该是把[first2, last2)copy到// [result + (last1 - first1), result + (last1 - first1) + (last2 - first2))// 大家可以讨论一下template <class InputIterator1, class InputIterator2, class ForwardIterator>inline ForwardIterator__uninitialized_copy_copy(InputIterator1 first1, InputIterator1 last1, InputIterator2 first2, InputIterator2 last2, ForwardIterator result){ ForwardIterator mid = uninitialized_copy(first1, last1, result); __STL_TRY { return uninitialized_copy(first2, last2, mid); } __STL_UNWIND(destroy(result, mid));}// Fills [result, mid) with x, and copies [first, last) into// [mid, mid + (last - first)).template <class ForwardIterator, class T, class InputIterator>inline ForwardIterator__uninitialized_fill_copy(ForwardIterator result, ForwardIterator mid, const T& x, InputIterator first, InputIterator last){ uninitialized_fill(result, mid, x); __STL_TRY { return uninitialized_copy(first, last, mid); } __STL_UNWIND(destroy(result, mid));}// Copies [first1, last1) into [first2, first2 + (last1 - first1)), and// fills [first2 + (last1 - first1), last2) with x.template <class InputIterator, class ForwardIterator, class T>inline void__uninitialized_copy_fill(InputIterator first1, InputIterator last1, ForwardIterator first2, ForwardIterator last2, const T& x){ ForwardIterator mid2 = uninitialized_copy(first1, last1, first2); __STL_TRY { uninitialized_fill(mid2, last2, x); } __STL_UNWIND(destroy(first2, mid2));}__STL_END_NAMESPACE#endif /* __SGI_STL_INTERNAL_UNINITIALIZED_H */// Local Variables:// mode:C++// End: 0 0
- stl_uninitialized.h
- 《STL源码剖析》-- stl_uninitialized.h
- 《STL源码剖析》--<stl_uninitialized.h>
- STL内存基本处理工具(stl_uninitialized.h)
- STL — 内存基本处理工具(<stl_uninitialized.h>)
- STL源码剖析 [特殊的空间配置器]（内存基本处理工具stl_uninitialized.h）
- 《STL源码剖析》---stl_uninitialized阅读笔记
- h
- h
- h
- ,h
- h
- h
- H
- h
- h
- h
- H
- opencv——实现目标模板匹配
- stl_construct.h
- ACMer必备技能——任重道远
- 利用easyUI的combobox打造自动提示组件
- MySql数据库的基本操作-表数据的增删改查
- stl_uninitialized.h
- Word2007怎样从任意页开始设置页码
- stl_iterator.h
- [WF4.0 实战] WF4.0申请审批实例
- type_traits.h
- 黑马程序员--多线程同步
- Android中Service详解
- stl_vector.h
- stl_pair.h
