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C++ Set 中的 Swap函数

C++ swap()函数用于交换(或交换)两个集合的内容，但是两个集合都必须具有相同类型，尽管大小可能有所不同。

Swap - 语法

void swap (set& x);

Swap - 参数

x : 设置与之交换内容的集合。

Swap - 返回值

没有

Swap - 例子1

让我们看一个简单的示例，将一组元素交换为另一组:

无涯教程网

在线运行复制代码

#include <iostream>
#include <set>

using namespace std;

int main(void) {
   set<int> m1 = {1,2,3,4,5};


   set<int> m2;

   m2.swap(m1);

   cout << "Set contains following elements" << endl;

   for (auto it = m2.begin(); it != m2.end(); ++it)
      cout << *it<< endl;

   return 0;
}

输出:

Set contains following elements
1
2
3
4
5

在上面的示例中，集合m1具有五个元素，而m2为空。当您将m1交换为m2时，m1的所有元素都将交换为m2。

链接：https://www.learnfk.comhttps://www.learnfk.com/c++/cpp-set-swap-function.html

来源：LearnFk无涯教程网

Swap - 例子2

让我们看一个简单的示例来交换两组内容:

复制代码

#include <iostream>
#include <set>

using namespace std;

 int main () {
   int myints[] = {10,20,30,40,50,60};
   set<int> first (myints,myints+3);
   set<int> second (myints+3,myints+6);  

   first.swap(second);

   cout << "first set contains:";
   for (set<int>::iterator it = first.begin(); it!=first.end(); ++it)
      cout << ' ' << *it;
   cout << '\n';

   cout << "second set contains:";
   for (set<int>::iterator it = second.begin(); it!=second.end(); ++it)
      cout << ' ' << *it;
   cout << '\n';

   return 0;
}

输出:

first set contains: 40 50 60
second set contains: 10 20 30

Swap - 例子3

让我们看一个简单的示例来交换两个集合的内容:

在线运行复制代码

#include<iostream>
#include<set>
using namespace std;
 
int main()
{
   //Take any two sets
    set<char> set1, set2;
    
    set1 = {'a','b','c','d'}; 
    set2 = {'x','y','z'};
 
   //Swap elements of sets
    swap(set1, set2);
 
   //Print the elements of sets
    cout << "set1:\n";
    for (auto it = set1.begin(); it != set1.end(); it++)
        cout << "\t" << *it<< '\n';
 
    cout << "set2:\n";
    for (auto it = set2.begin(); it != set2.end(); it++)
        cout << "\t" << *it<< '\n';
 
    return 0;
}

输出:

set1:
	x
	y
	z
set2:
	a
	b
	c
	d

在上面的示例中，另一种形式的swap()函数用于交换两个集合的内容。

Swap - 例子4

让我们看一个简单的例子:

在线运行复制代码

#include <set>  
#include <iostream>  
  
int main( )  
{  
   using namespace std;  
   set <int> s1, s2, s3;  
   set <int>::iterator s1_Iter;  
  
   s1.insert( 10 );  
   s1.insert( 20 );  
   s1.insert( 30 );  
   s2.insert( 100 );  
   s2.insert( 200 );  
   s3.insert( 300 );  
  
   cout << "The original set s1 is:";  
   for ( s1_Iter = s1.begin( ); s1_Iter != s1.end( ); s1_Iter++ )  
      cout << " " << *s1_Iter;  
   cout   << "." << endl;  
  
  //This is the member function version of swap  
   s1.swap( s2 );  
  
   cout << "After swapping with s2, list s1 is:";  
   for ( s1_Iter = s1.begin( ); s1_Iter != s1.end( ); s1_Iter++ )  
      cout << " " << *s1_Iter;  
   cout  << "." << endl;  
  
  //This is the specialized template version of swap  
   swap( s1, s3 );  
  
   cout << "After swapping with s3, list s1 is:";  
   for ( s1_Iter = s1.begin( ); s1_Iter != s1.end( ); s1_Iter++ )  
      cout << " " << *s1_Iter;  
   cout   << "." << endl;  
}

输出:

The original set s1 is: 10 20 30.
After swapping with s2, list s1 is: 100 200.
After swapping with s3, list s1 is: 300.

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