C++ reverse函数的用法

#include <algorithm>

template <class BidirectionalIterator>
void reverse (BidirectionalIterator first,BidirectionalIterator last);

vector<int> v = {5,4,3,2,1};
reverse(v.begin(),v.end());//v的值为1,2,3,4,5

string str="www.mathor.top";
reverse(str.begin(),str.end());//str结果为pot.rohtam.wwww

template <class BidirectionalIterator>
void reverse (BidirectionalIterator first, BidirectionalIterator last)
{
    while ((first!=last)&&(first!=--last))
    {
        std::iter_swap (first,last);
        ++first;
    }
}