swap

描述 (Description)

C ++函数std::forward_list::swap()将第一个forward_list的内容与另一个交换。 如有必要，此函数会更改forward_list的大小。

声明 (Declaration)

以下是std :: forward_list :: swap()函数形式std :: forward_list头的声明。

C++11template

void swap (forward_list& first, forward_list& second);

参数 (Parameters)first - 第一个forward_list对象。

second - 第二个forward_list对象。

返回值

没有

异常 (Exceptions)

这个函数永远不会抛出异常。

时间复杂

线性即O(n)

例子 (Example)

以下示例显示了std :: forward_list :: swap()函数的用法。#include

#include

using namespace std;

int main(void) {

forward_list fl1 = {1, 2, 3, 4, 5};;

forward_list fl2 = {10, 20, 30};

cout << "List fl1 contents before swap operation" << endl;

for (auto it = fl1.begin(); it != fl1.end(); ++it)

cout << *it << endl;

cout << "List fl2 contents before swap operation" << endl;

for (auto it = fl2.begin(); it != fl2.end(); ++it)

cout << *it << endl;

swap(fl1, fl2);

cout << endl;

cout << "List fl1 contents after swap operation" << endl;

for (auto it = fl1.begin(); it != fl1.end(); ++it)

cout << *it << endl;

cout << "List fl2 contents after swap operation" << endl;

for (auto it = fl2.begin(); it != fl2.end(); ++it)

cout << *it << endl;

return 0;

}

让我们编译并运行上面的程序，这将产生以下结果 -List fl1 contents before swap operation

1

2

3

4

5

List fl2 contents before swap operation

10

20

30

List fl1 contents after swap operation

10

20

30

List fl2 contents after swap operation

1

2

3

4

5