STL 之swap, iter_swap, swap_ranges

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作用：交换元素

声明：

#include <algorithm>  
template<class Type>  
void swap(Type& objcet1, Type& objec2);  
  
template<class forwardItr1,class forwardItr2>  
void iter_swap(forwardItr1 first,forwardItr2 scecod);  
  
template<class forwardItr1, class forwardItr2>  
forwardItr2 swap_ranges(forwardItr1 first,forwardItr1 last, forwardItr2 first2);  

示例代码：

#include <iostream>  
#include <list>  
  
#include <string>  
#include <numeric>  
#include <iterator>  
#include <vector>  
#include <functional>  
  
#include <algorithm>  
  
using namespace std;  
  
int main() {  
    char cList[10] = {'A','B','C','D','F','G','H','I','J','K'};  
    vector<char> charList(cList,cList+10);  
  
    vector<char>::iterator charItr;  
    ostream_iterator<char> screen(cout," ");  
    cout << "charList:" << endl;  
    copy(charList.begin(),charList.end(),screen);  
    cout << endl;  
  
    // 容器内部元素交互  
    swap(charList[0],charList[1]);  
    cout << "charList.swap" << endl;  
    copy(charList.begin(),charList.end(),screen);  
    cout << endl;  
  
    // 用迭代器进行交互  
    iter_swap(charList.begin() + 2,charList.begin() + 3);  
    cout << "charList.iter_swap" << endl;  
    copy(charList.begin(),charList.end(),screen);  
    cout << endl;  
  
    charItr = charList.begin() + 4;  
    iter_swap(charItr,charItr + 1);  
    cout << "charList.iter_swap" << endl;  
    copy(charList.begin(),charList.end(),screen);  
    cout << endl;  
  
    int list[10] = {1,2,3,4,5,6,7,8,9,10};  
    vector<int> intList(list,list + 10);  
    ostream_iterator<int> screenInt(cout, " ");  
    cout << "intList:" << endl;  
    copy(intList.begin(),intList.end(),screenInt);  
    cout << endl;  
  
    swap_ranges(intList.begin(),intList.begin()+4,intList.begin()+5);  
    cout << "intList.swap_ranges:" << endl;  
    copy(intList.begin(),intList.end(),screenInt);  
    cout << endl;  
  
    // 不同容器之间元素交互  
    swap_ranges(list,list+10,intList.begin());  
    cout << "list:" << endl;  
    copy(list,list+10,screenInt);  
    cout << endl;   
    cout << "intList: " << endl;  
    copy(intList.begin(),intList.end(),screenInt);  
    cout << endl;  
  
    return 0;  
}  

运行结果：

charList:
A B C D F G H I J K
charList.swap
B A C D F G H I J K
charList.iter_swap
B A D C F G H I J K
charList.iter_swap
B A D C G F H I J K
intList:
1 2 3 4 5 6 7 8 9 10
intList.swap_ranges:
6 7 8 9 5 1 2 3 4 10
list:
6 7 8 9 5 1 2 3 4 10
intList:
1 2 3 4 5 6 7 8 9 10

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