C++ Program to Demonstrate Splice Operation on Lists

This C++ program demonstrates the splice operation on std::list container. The splice operation removes the elements from one std::list and copies them into another. The program uses two versions of std::list::splice – one which moves only the element pointed by an iterator and second which moves the elements between the beginning and ending iterators.

Here is the source code of the C++ program which demonstrates the splice operation on std::list container. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

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/*
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 * C++ Program to Demonstrate Splice Operation on Lists

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 */
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#include <iostream>
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#include <list>
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#include <algorithm>
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#include <string>
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using namespace std;
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```
 
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void print(list<string>& l)
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{
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    list<string>::const_iterator i = l.begin();

```
 
```
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    while(i != l.end()) {
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        cout << *i << "  ";
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        i++;
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    }
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    cout << "\n";
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}
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```
 
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int main() {
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    list<string> l1, l2;
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    l1.push_back(string("John Keats"));
```

    l1.push_back(string("William Wordsworth"));

    l1.push_back(string("Walt Whitman"));

    l1.push_back(string("Robert Frost"));

    l1.push_back(string("William Shakespeare"));

    l1.push_back(string("Percy Shelley"));

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    cout << "List 1 : ";
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    print(l1);
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    cout << "List 2 : ";
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    print(l2);
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```
 
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    l2.splice(l2.end(), l1, l1.begin());

    cout << "After l2.splice(l2.end(), l1, l1.begin());\n";

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    cout << "List 1 : ";
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    print(l1);
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    cout << "List 2 : ";
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    print(l2);
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    l2.splice(l2.begin(), l1, ++(l1.begin()), --(l1.end()));

    cout << "After l2.splice(l2.begin(), l1, ++(l1.begin()), --(l1.end()));\n";

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    cout << "List 1 : ";
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    print(l1);
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    cout << "List 2 : ";
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    print(l2);
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}
```

$ gcc test.cpp
$ a.out
List 1 : John Keats  William Wordsworth  Walt Whitman  Robert Frost  William Shakespeare  Percy Shelley  
List 2 : 
After l2.splice(l2.end(), l1, l1.begin());
List 1 : William Wordsworth  Walt Whitman  Robert Frost  William Shakespeare  Percy Shelley  
List 2 : John Keats  
After l2.splice(l2.begin(), l1, ++(l1.begin()), --(l1.end()));
List 1 : William Wordsworth  Percy Shelley  
List 2 : Walt Whitman  Robert Frost  William Shakespeare  John Keats