C++中的转发列表|设置1(简介和重要功能)
本文讨论了更多功能
除了插入和删除之外，可以在转发列表中使用的一些其他操作如下：
1. merge() ：-此函数用于将一个转发列表与其他列表合并。如果两个列表都已排序，则返回的结果列表也将被排序。
2.运算符“ =” ：-此运算符一个转发列表复制到另一个列表中。在这种情况下制作的副本是深层副本。
// C++ code to demonstrate the working of
// merge() and operator=
#include
#include
using namespace std;
int main()
{
// Initializing 1st forward list
forward_list flist1 = {1, 2, 3};
// Declaring 2nd forward list
forward_list flist2;
// Creating deep copy using "="
flist2 = flist1;
// Displaying flist2
cout << "The contents of 2nd forward list"
" after copy are : ";
for (int &x : flist2)
cout << x << " ";
cout << endl;
// Using merge() to merge both list in 1
flist1.merge(flist2);
// Displaying merged forward list
// Prints sorted list
cout << "The contents of forward list "
"after merge are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl;
return 0;
}
输出：
The contents of 2nd forward list after copy are : 1 2 3
The contents of forward list after merge are : 1 1 2 2 3 3
3. sort() ：-此函数用于对转发列表进行排序。
4. unique() ：-此函数删除多次出现的数字，并返回带有唯一元素的前向列表。应该对转发列表进行排序，以使该函数成功执行。
// C++ code to demonstrate the working of
// sort() and unique()
#include
#include // for sort() and unique()
using namespace std;
int main()
{
// Initializing 1st forward list
forward_list flist1 = {1, 2, 3, 2, 3, 3, 1};
// Sorting the forward list using sort()
flist1.sort();
// Displaying sorted forward list
cout << "The contents of forward list after "
"sorting are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl;
// Use of unique() to remove repeated occurrences
flist1.unique();
// Displaying forward list after using unique()
cout << "The contents of forward list after "
"unique operation are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl;
return 0;
}
输出：
The contents of forward list after sorting are : 1 1 2 2 3 3 3
The contents of forward list after unique operation are : 1 2 3
5. reverse() ：-此函数用于反向转发列表。
6. swap() ：-此函数将一个转发列表的内容与其他列表交换。
// C++ code to demonstrate the working of
// reverse() and swap()
#include
#include // for reverse() and swap()
using namespace std;
int main()
{
// Initializing 1st forward list
forward_list flist1 = {1, 2, 3,};
// Initializing 2nd forward list
forward_list flist2 = {4, 5, 6};
// Using reverse() to reverse 1st forward list
flist1.reverse();
// Displaying reversed forward list
cout << "The contents of forward list after"
" reversing are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl << endl;
// Displaying forward list before swapping
cout << "The contents of 1st forward list "
"before swapping are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl;
cout << "The contents of 2nd forward list "
"before swapping are : ";
for (int &x : flist2)
cout << x << " ";
cout << endl;
// Use of swap() to swap the list
flist1.swap(flist2);
// Displaying forward list after swapping
cout << "The contents of 1st forward list "
"after swapping are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl;
cout << "The contents of 2nd forward list "
"after swapping are : ";
for (int &x : flist2)
cout << x << " ";
cout << endl;
return 0;
}
输出：
The contents of forward list after reversing are : 3 2 1
The contents of 1st forward list before swapping are : 3 2 1
The contents of 2nd forward list before swapping are : 4 5 6
The contents of 1st forward list after swapping are : 4 5 6
The contents of 2nd forward list after swapping are : 3 2 1
7. clear() ：-此函数清除转发列表的内容。使用此函数，转发列表将变为空。
8. empty() ：-如果列表为空，则此函数返回true，否则返回false。
// C++ code to demonstrate the working of
// clear() and empty()
#include
#include // for clear() and empty()
using namespace std;
int main()
{
// Initializing forward list
forward_list flist1 = {1, 2, 3,};
// Displaying forward list before clearing
cout << "The contents of forward list are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl;
// Using clear() to clear the forward list
flist1.clear();
// Displaying list after clear() performed
cout << "The contents of forward list after "
<< "clearing are : ";
for (int &x : flist1)
cout << x << " ";
cout << endl;
// Checking if list is empty
flist1.empty() ? cout << "Forward list is empty" :
cout << "Forward list is not empty";
return 0;
}
输出：
The contents of forward list are : 1 2 3
The contents of forward list after clearing are :
Forward list is empty
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