變動性算法源代碼分析與使用示例（copy_backward、 transform、 replace_copy_if 等）

首先回顧前面的文章，我們把for_each 歸類為非變動性算法，實際上它也可以算是變動性算法，取決于傳入的第三個參數，即函數

指針。如果在函數內對容器元素做了修改，那么就屬于變動性算法。

變動性算法源代碼分析與使用示例：

一、copy、copy_backward

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//?TEMPLATE?FUNCTION?copy
template<class?_InIt,?class?_OutIt,?class?_InOutItCat>
inline
_OutIt?__CLRCALL_OR_CDECL?_Copy_opt(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest,
????????????????????????????????????_InOutItCat,?_Nonscalar_ptr_iterator_tag,?_Range_checked_iterator_tag)
{
????//?copy?[_First,?_Last)?to?[_Dest,?...),?arbitrary?iterators
????_DEBUG_RANGE(_First,?_Last);
????for?(;?_First?!=?_Last;?++_Dest,?++_First)
????????*_Dest?=?*_First;
????return?(_Dest);
}

template<class?_InIt,?class?_OutIt>
inline
_IF_CHK(_OutIt)?__CLRCALL_OR_CDECL?copy(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest)
{
????//?copy?[_First,?_Last)?to?[_Dest,?...)
????return?(_Copy_opt(_CHECKED_BASE(_First),?_CHECKED_BASE(_Last),?_Dest,
??????????????????????_Iter_random(_First,?_Dest),?_Ptr_cat(_First,?_Dest),?_Range_checked_iterator_tag()));
}

//?TEMPLATE?FUNCTION?copy_backward
template<class?_BidIt1,?class?_BidIt2,?class?_InOutItCat>
inline
_BidIt2?__CLRCALL_OR_CDECL?_Copy_backward_opt(_BidIt1?_First,?_BidIt1?_Last,?_BidIt2?_Dest,
????????_InOutItCat,?_Nonscalar_ptr_iterator_tag,?_Range_checked_iterator_tag)
{
????//?copy?[_First,?_Last)?backwards?to?[...,?_Dest),?arbitrary?iterators
????_DEBUG_RANGE(_First,?_Last);
????while?(_First?!=?_Last)
????????*--_Dest?=?*--_Last;
????return?(_Dest);
}

template?<?class?_BidIt1,
?????????class?_BidIt2?>?inline
_IF_CHK(_BidIt2)?__CLRCALL_OR_CDECL?copy_backward(_BidIt1?_First,?_BidIt1?_Last,?_BidIt2?_Dest)
{
????//?copy?[_First,?_Last)?backwards?to?[...,?_Dest)
????return?_Copy_backward_opt(_CHECKED_BASE(_First),?_CHECKED_BASE(_Last),?_Dest,
??????????????????????????????_Iter_random(_First,?_Dest),?_Ptr_cat(_First,?_Dest),?_STD?_Range_checked_iterator_tag());
}

?

for?(;?_First?!=?_Last;?++_Dest,?++_First)


????????*_Dest?=?*_First;

copy_backward 調用了_Copy_backward_opt，與copy 不同的是實現反向拷貝，即從尾端開始拷貝，所以是遞減迭代器。

while?(_First?!=?_Last)


????????*--_Dest?=?*--_Last;

示例代碼1：

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?
#include?<iostream>
#include?<vector>
#include?<list>
#include?<algorithm>
using?namespace?std;

void?print_element(int?n)
{
????cout?<<?n?<<?'?';
}

void?add_3(int?&n)
{
????n?+=?3;
}

int?main(void)
{
????int?a[]?=?{?1,?2,?3,?4,?5?};
????vector<int>?v(a,?a?+?5);
????list<int>?l(15);

????for_each(v.begin(),?v.end(),?print_element);
????cout?<<?endl;

????for_each(v.begin(),?v.end(),?add_3);

????for_each(v.begin(),?v.end(),?print_element);
????cout?<<?endl;

????for_each(l.begin(),?l.end(),?print_element);
????cout?<<?endl;

????copy(v.begin(),?v.end(),?l.begin());
????for_each(l.begin(),?l.end(),?print_element);
????cout?<<?endl;

????copy_backward(v.begin(),?v.end(),?l.end());
????for_each(l.begin(),?l.end(),?print_element);
????cout?<<?endl;

????return?0;
}



二、transfrom

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//?TEMPLATE?FUNCTION?transform?WITH?UNARY?OP
template<class?_InIt,?class?_OutIt,?class?_Fn1,?class?_InOutItCat>
inline
_OutIt?_Transform(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest,?_Fn1?_Func,
??????????????????_InOutItCat,?_Range_checked_iterator_tag)
{
????//?transform?[_First,?_Last)?with?_Func
????_DEBUG_RANGE(_First,?_Last);
????_DEBUG_POINTER(_Dest);
????_DEBUG_POINTER(_Func);
????for?(;?_First?!=?_Last;?++_First,?++_Dest)
????????*_Dest?=?_Func(*_First);
????return?(_Dest);
}

template<class?_InIt,?class?_OutIt,?class?_Fn1>
inline
_IF_CHK(_OutIt)?transform(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest,?_Fn1?_Func)
{
????return?_Transform(_CHECKED_BASE(_First),?_CHECKED_BASE(_Last),?_Dest,?_Func,
??????????????????????_Iter_random(_First,?_Dest),?_STD?_Range_checked_iterator_tag());
}


//?TEMPLATE?FUNCTION?transform?WITH?BINARY?OP
template<class?_InIt1,?class?_InIt2,?class?_OutIt,?class?_Fn2,?class?_InItCats,?class?_InOutItCat>
inline
_OutIt?_Transform(_InIt1?_First1,?_InIt1?_Last1,?_InIt2?_First2,
??????????????????_OutIt?_Dest,?_Fn2?_Func,
??????????????????_InItCats,?_InOutItCat,
??????????????????_Range_checked_iterator_tag,?_Range_checked_iterator_tag)
{
????//?transform?[_First1,?_Last1)?and?[_First2,?_Last2)?with?_Func
????_DEBUG_RANGE(_First1,?_Last1);
????_DEBUG_POINTER(_Dest);
????_DEBUG_POINTER(_Func);
????for?(;?_First1?!=?_Last1;?++_First1,?++_First2,?++_Dest)
????????*_Dest?=?_Func(*_First1,?*_First2);
????return?(_Dest);
}


template<class?_InIt1,?class?_InIt2,?class?_OutIt,?class?_Fn2,?class?_InOutItCat>
inline
_OutIt?_Transform(_InIt1?_First1,?_InIt1?_Last1,?_InIt2?_First2,
??????????????????_OutIt?_Dest,?_Fn2?_Func,
??????????????????random_access_iterator_tag,?_InOutItCat,
??????????????????_Range_checked_iterator_tag,?_Range_checked_iterator_tag)
{
????//?transform?[_First1,?_Last1)?and?[_First2,?_Last2)?with?_Func
????//?for?range?checked?iterators,?this?will?make?sure?there?is?enough?space
????_InIt2?_Last2?=?_First2?+?(_Last1?-?_First1);
????(_Last2);
????return?_Transform(_First1,?_Last1,?_CHECKED_BASE(_First2),
??????????????????????_Dest,?_Func,
??????????????????????forward_iterator_tag(),?forward_iterator_tag(),
??????????????????????_Range_checked_iterator_tag(),?_Range_checked_iterator_tag());
}


template<class?_InIt1,?class?_InIt2,?class?_OutIt,?class?_Fn2>
inline
_IF_CHK2_(_InIt2,?_OutIt,?_OutIt)?transform(_InIt1?_First1,?_InIt1?_Last1,?_InIt2?_First2,
????????_OutIt?_Dest,?_Fn2?_Func)
{
????return?_Transform(_CHECKED_BASE(_First1),?_CHECKED_BASE(_Last1),?_First2,?_Dest,?_Func,
??????????????????????_Iter_random(_First1,?_First2),?_Iter_random(_First1,?_Dest),
??????????????????????_STD?_Range_checked_iterator_tag(),?_STD?_Range_checked_iterator_tag());
}


實際上transfrom 重載了兩個版本，一個是四個參數的，即將前兩個參數指定區間內的元素執行某種操作（函數內）后拷貝到第三個

參數指示的區間上。而另一個版本是五個參數的，即將兩個區間的對應元素進行某種操作后拷貝到第三個區間上去。核心的代碼區

別在于下面兩行：

*_Dest = _Func(*_First);

*_Dest = _Func(*_First1, *_First2);

示例代碼2：

C++ Code?
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?
#include?<iostream>
#include?<vector>
#include?<list>
#include?<algorithm>
using?namespace?std;

void?print_element(int?n)
{
????cout?<<?n?<<?'?';
}

int?fun(int?a)
{
????return?2?*?a;
}

int?fun2(int?a,?int?b)
{
????return?a?+?b;
}

int?main(void)
{
????int?a[]?=?{?1,?2,?3,?4,?5?};
????vector<int>?v(a,?a?+?5);

????list<int>?l(5);
????list<int>?ll(2);

????transform(v.begin(),?v.end(),?l.begin(),?fun);
????for_each(l.begin(),?l.end(),?print_element);
????cout?<<?endl;

????transform(v.begin(),?v.begin()?+?2,?v.begin()?+?3,?ll.begin(),?fun2);
????for_each(ll.begin(),?ll.end(),?print_element);
????cout?<<?endl;

????return?0;
}

輸出為 ：

2 4 6 8 10

5 7


三、replace、replace_copy、replace_copy_if

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//?TEMPLATE?FUNCTION?replace
template?<?class?_FwdIt,
?????????class?_Ty?>?inline
void?_Replace(_FwdIt?_First,?_FwdIt?_Last,
??????????????const?_Ty?&_Oldval,?const?_Ty?&_Newval)
{
????//?replace?each?matching?_Oldval?with?_Newval
????_DEBUG_RANGE(_First,?_Last);
????for?(;?_First?!=?_Last;?++_First)
????????if?(*_First?==?_Oldval)
????????????*_First?=?_Newval;
}

template?<?class?_FwdIt,
?????????class?_Ty?>?inline
void?replace(_FwdIt?_First,?_FwdIt?_Last,
?????????????const?_Ty?&_Oldval,?const?_Ty?&_Newval)
{
????//?replace?each?matching?_Oldval?with?_Newval
????_Replace(_CHECKED_BASE(_First),?_CHECKED_BASE(_Last),?_Oldval,?_Newval);
}


//?TEMPLATE?FUNCTION?replace_copy
template<class?_InIt,?class?_OutIt,?class?_Ty,?class?_InOutItCat>
inline
_OutIt?_Replace_copy(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest,
?????????????????????const?_Ty?&_Oldval,?const?_Ty?&_Newval,
?????????????????????_InOutItCat,?_Range_checked_iterator_tag)
{
????//?copy?replacing?each?matching?_Oldval?with?_Newval
????_DEBUG_RANGE(_First,?_Last);
????_DEBUG_POINTER(_Dest);
????for?(;?_First?!=?_Last;?++_First,?++_Dest)
????????*_Dest?=?*_First?==?_Oldval???_Newval?:?*_First;
????return?(_Dest);
}

template?<?class?_InIt,
?????????class?_OutIt,
?????????class?_Ty?>?inline
_IF_CHK(_OutIt)?replace_copy(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest,
?????????????????????????????const?_Ty?&_Oldval,?const?_Ty?&_Newval)
{
????//?copy?replacing?each?matching?_Oldval?with?_Newval
????return?_Replace_copy(_CHECKED_BASE(_First),?_CHECKED_BASE(_Last),?_Dest,?_Oldval,?_Newval,
?????????????????????????_Iter_random(_First,?_Dest),?_STD?_Range_checked_iterator_tag());
}



//?TEMPLATE?FUNCTION?replace_copy_if
template<class?_InIt,?class?_OutIt,?class?_Pr,?class?_Ty,?class?_InOutItCat>
inline
_OutIt?_Replace_copy_if(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest,
????????????????????????_Pr?_Pred,?const?_Ty?&_Val,?_InOutItCat,?_Range_checked_iterator_tag)
{
????//?copy?replacing?each?satisfying?_Pred?with?_Val
????_DEBUG_RANGE(_First,?_Last);
????_DEBUG_POINTER(_Dest);
????_DEBUG_POINTER(_Pred);
????for?(;?_First?!=?_Last;?++_First,?++_Dest)
????????*_Dest?=?_Pred(*_First)???_Val?:?*_First;
????return?(_Dest);
}


template?<?class?_InIt,
?????????class?_OutIt,
?????????class?_Pr,
?????????class?_Ty?>?inline
_IF_CHK(_OutIt)?replace_copy_if(_InIt?_First,?_InIt?_Last,?_OutIt?_Dest,
????????????????????????????????_Pr?_Pred,?const?_Ty?&_Val)
{
????//?copy?replacing?each?satisfying?_Pred?with?_Val
????return?_Replace_copy_if(_CHECKED_BASE(_First),?_CHECKED_BASE(_Last),?_Dest,?_Pred,?_Val,
????????????????????????????_Iter_random(_First,?_Dest),?_STD?_Range_checked_iterator_tag());
}

if?(*_First?==?_Oldval)


????????????*_First?=?_Newval;

replace_copy 帶5個參數，先判斷前兩個參數指示區間的元素是否是_Oldval，若是則替換成_Newval 賦值到第三個參數指示的區間上，否則直接賦值

*_Dest?=?*_First?==?_Oldval???_Newval?:?*_First; ?

replace_copy_if 帶5個參數，在每個元素拷貝時先判斷是否滿足條件（函數返回為真），滿足則替換成_Val，否則保持不變。

*_Dest?=?_Pred(*_First)???_Val?:?*_First;

C++ Code?
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#include?<iostream>
#include?<vector>
#include?<list>
#include?<algorithm>
using?namespace?std;

void?print_element(int?n)
{
????cout?<<?n?<<?'?';
}

bool?fun(int?a)
{
????return?a?<?10;
}

int?main(void)
{
????int?a[]?=?{?1,?2,?3,?4,?3?};
????vector<int>?v(a,?a?+?5);
????list<int>?l(5);

????replace(v.begin(),?v.end(),?3,?13);
????for_each(v.begin(),?v.end(),?print_element);
????cout?<<?endl;

????replace_copy(v.begin(),?v.end(),?l.begin(),?13,?3);
????for_each(v.begin(),?v.end(),?print_element);
????cout?<<?endl;

????for_each(l.begin(),?l.end(),?print_element);
????cout?<<?endl;

????replace_copy_if(v.begin(),?v.end(),?l.begin(),?fun,?0);
????for_each(l.begin(),?l.end(),?print_element);
????cout?<<?endl;


????return?0;
}

輸出為：

1 2 13 4 13

1 2 13 4 13

1 2 ?3 ?4 ?3

0 0 13 0 13


參考：

C++ primer 第四版
Effective C++ 3rd
C++編程規范

轉載于:https://www.cnblogs.com/alantu2018/p/8471423.html

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