в 14:21, 25 мая 2010

2010-05-25T14:21:06Z

Admin: 1 версия: Импорт контента...

2010-05-25T10:28:02Z

1 версия: Импорт контента...

Новая страница

==mem_fun_ref and print==

<source lang="cpp">
#include <algorithm>
#include <functional>
#include <iostream>
#include <iterator>
#include <list>
using namespace std;
class Employee
{
public:
Employee( const string& name = "", int sales = 0,int district = 0 );
bool operator>( const Employee& rhs ) const;
void print() const;
private:
int district_;
string name_;
int sales_;
};
inline
Employee::Employee( const string& name, int sales,
int district )
: district_( district ), name_( name ), sales_( sales )
{}
inline
bool Employee::operator>( const Employee& rhs ) const
{ return sales_ > rhs.sales_; }
inline
void Employee::print() const
{ cout << name_ << " from District " << district_
<< " has sales of $" << sales_ << endl;
}
int main( )
{
list<Employee> list1;
list1.push_back( Employee( "A", 3, 1 ) );
list1.push_back( Employee( "B", 4, 1 ) );
list1.push_back( Employee( "C", 8, 1 ) );
list1.sort( greater<Employee>() );
for_each( list1.begin(), list1.end(), mem_fun_ref( &Employee::print ) );
}

</source>

==Print all elements in a list with copy function==

<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);
}
/*
list1: 0 1 2 3 4 5
list2: 5 4 3 2 1 0

*/

</source>

==Print out each element in a 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>
using namespace std;
/* PRINT_ELEMENTS()
* - prints optional C-string optcstr followed by
* - all elements of the collection coll
* - separated by spaces
*/
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
{
typename T::const_iterator pos;
std::cout << optcstr;
for (pos=coll.begin(); pos!=coll.end(); ++pos) {
std::cout << *pos << " ";
}
std::cout << std::endl;
}

int main()
{
list<int> coll;
// insert elements from 1 to 9
for (int i=1; i<=9; ++i) {
coll.push_back(i);
}
PRINT_ELEMENTS(coll,"initialized: ");
}
/*
initialized: 1 2 3 4 5 6 7 8 9
*/

</source>

==Use ostream_iterator and copy to display collection content==

<source lang="cpp">

#include <iostream>
using std::cout;
using std::endl;
#include <list>
#include <algorithm>
#include <iterator>
int main()
{
int array[ 4 ] = { 2, 6, 4, 8 };
std::list< int > values; // create list of ints
std::list< int > otherValues; // create list of ints
std::ostream_iterator< int > output( cout, " " );
// insert items in values
values.push_front( 1 );
values.push_front( 3 );
values.push_back( 4 );
values.push_back( 2 );
cout << "values contains: ";
std::copy( values.begin(), values.end(), output );
otherValues.insert( otherValues.begin(), array, array + 4 );
cout << "\n\notherValues contains: ";
std::copy( otherValues.begin(), otherValues.end(), output );

values.merge( otherValues );
cout << "\n\nvalues contains: ";
std::copy( values.begin(), values.end(), output );
cout << endl;
return 0;
}
/*
values contains: 3 1 4 2
otherValues contains: 2 6 4 8
values contains: 2 3 1 4 2 6 4 8
*/

</source>

← Предыдущая	Версия 14:21, 25 мая 2010
(нет различий)

C++/List/list display - История изменений

в 14:21, 25 мая 2010

Admin: 1 версия: Импорт контента...