STL algorithm算法rotate,rotate_copy(51)
rotate原型：
std::rotate
- C++98
- C++11
template <class ForwardIterator>
ForwardIterator rotate (ForwardIterator first, ForwardIterator middle,
ForwardIterator last);
效果是交换[middle,last)和[first,middle)部分的位置。
具体实现请自行搜索。
类似实现为：
template <class ForwardIterator>
void rotate (ForwardIterator first, ForwardIterator middle,
ForwardIterator last)
{
ForwardIterator next = middle;
while (first!=next)
{
swap (*first++,*next++);
if (next==last) next=middle;
else if (first==middle) middle=next;
}
}一个简单的例子：
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
void mrotate()
{
vector<int> vi{1,2,3,4,5,6};
vector<int> vresult{10,20,30,40,50};
cout<<"vi=";
for(int i:vi)
cout<<i<<" ";
cout<<endl;
cout<<"vresult=";
for(int i:vresult)
cout<<i<<" ";
cout<<endl;
rotate(vi.begin(),vi.begin()+3,vi.end());
rotate(vresult.begin(),vresult.end()-1,vresult.end());
cout<<"after rotate(vi.begin(),vi.begin()+3,vi.end())"<<endl;
cout<<"vi=";
for(int i:vi)
cout<<i<<" ";
cout<<endl;
cout<<"after rotate(vresult.begin(),vresult.end()-1,vresult.end());"<<endl;
cout<<"vresult=";
for(int i:vresult)
cout<<i<<" ";
cout<<endl;
}
运行截图：
rotate_copy原型：
std::rotate_copy
template <class ForwardIterator, class OutputIterator>
OutputIterator rotate_copy (ForwardIterator first, ForwardIterator middle,
ForwardIterator last, OutputIterator result);
实现类似于：
template <class ForwardIterator, class OutputIterator>
OutputIterator rotate_copy (ForwardIterator first, ForwardIterator middle,
ForwardIterator last, OutputIterator result)
{
result=std::copy (middle,last,result);
return std::copy (first,middle,result);
}一个简单的例子：
#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;
void mrotatecopy()
{
vector<int> vi{1,2,3,4,5,6};
vector<int> vresult(6);
cout<<"vi=";
for(int i:vi)
cout<<i<<" ";
cout<<endl;
cout<<"vresult=";
for(int i:vresult)
cout<<i<<" ";
cout<<endl;
rotate_copy(vi.begin(),vi.begin()+3,vi.end(),vresult.begin());
cout<<"after rotate_copy(vi.begin(),vi.begin()+3,vi.end(),vresult.begin())"<<endl;
cout<<"vi=";
for(int i:vi)
cout<<i<<" ";
cout<<endl;
cout<<"vresult=";
for(int i:vresult)
cout<<i<<" ";
cout<<endl;
}
运行截图：
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//写的错误或者不好的地方请多多指导，可以在下面留言或者点击左上方邮件地址给我发邮件，指出我的错误以及不足，以便我修改，更好的分享给大家，谢谢。
转载请注明出处：http://blog.csdn.net/qq844352155
author:天下无双
Email:[email protected]
2014-9-26
于GDUT
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