в 14:21, 25 мая 2010

2010-05-25T14:21:17Z

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2010-05-25T10:29:34Z

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==merge list with user-defined objects with greater==

<source lang="cpp">#include <algorithm>
#include <functional>
#include <iostream>
#include <iterator>
#include <list>
using namespace std;
class Salesperson
{
public:
Salesperson( const string& name = "", int sales = 0,int district = 0 );
bool operator>( const Salesperson& rhs ) const;
void print() const;
private:
int district_;
string name_;
int sales_;
};
inline
Salesperson::Salesperson( const string& name, int sales,
int district )
: district_( district ), name_( name ), sales_( sales )
{}
inline
bool Salesperson::operator>( const Salesperson& rhs ) const
{ return sales_ > rhs.sales_; }
inline
void Salesperson::print() const
{
cout << name_ << " from District " << district_ << " has sales of $" << sales_ << endl;
}
int main( )
{
list<Salesperson> list1;
list1.push_back( Salesperson( "A", 37000, 1 ) );
list1.push_back( Salesperson( "B", 49000, 1 ) );
list1.push_back( Salesperson( "C", 48500, 1 ) );
// sort District 1 salespeople in descending order and display
list1.sort( greater<Salesperson>() );
for_each( list1.begin(), list1.end(), mem_fun_ref( &Salesperson::print ) );
list<Salesperson> list2;
list2.push_back( Salesperson( "A", 65000, 2 ) );
list2.push_back( Salesperson( "B", 33000, 2 ) );
list2.push_back( Salesperson( "C", 47000, 2 ) );
list1.merge( list2, greater<Salesperson>() );
for_each( list1.begin(), list1.end(),mem_fun_ref( &Salesperson::print ) );
}</source>

==Merge one list with another list==

<source lang="cpp">/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <list>
#include <algorithm>
#include <iterator>
using namespace std;
void printLists (const list<int>& l1, const list<int>& l2)
{
cout << "list1: ";
copy (l1.begin(), l1.end(), ostream_iterator<int>(cout," "));
cout << endl << "list2: ";
copy (l2.begin(), l2.end(), ostream_iterator<int>(cout," "));
cout << endl << endl;
}
int main()
{
// create two empty lists
list<int> list1, list2;
// fill both lists with elements
for (int i=0; i<6; ++i) {
list1.push_back(i);
list2.push_front(i);
}
printLists(list1, list2);

// merge both sorted lists into the first list
list1.merge(list2);
printLists(list1, list2);
}</source>
<pre class=codeResult>list1: 0 1 2 3 4 5
list2: 5 4 3 2 1 0
list1: 0 1 2 3 4 5 5 4 3 2 1 0
list2:</pre>

==Merge two lists==

<source lang="cpp">#include <iostream>
#include <list>
using namespace std;
int main()
{
list<int> lst1, lst2;
int i;
for(i=0; i<10; i+=2) lst1.push_back(i);
for(i=1; i<11; i+=2) lst2.push_back(i);
cout << "Contents of lst1:\n";
list<int>::iterator p = lst1.begin();
while(p != lst1.end()) {
cout << *p << " ";
p++;
}
cout << endl << endl;
cout << "Contents of lst2:\n";
p = lst2.begin();
while(p != lst2.end()) {
cout << *p << " ";
p++;
}
cout << endl << endl;
lst1.merge(lst2);
if(lst2.empty())
cout << "lst2 is now empty\n";
cout << "Contents of lst1 after merge:\n";
p = lst1.begin();
while(p != lst1.end()) {
cout << *p << " ";
p++;
}
return 0;
}</source>
<pre class=codeResult>Contents of lst1:
0 2 4 6 8
Contents of lst2:
1 3 5 7 9
lst2 is now empty
Contents of lst1 after merge:
0 1 2 3 4 5 6 7 8 9</pre>

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