pair

An object that contains two other objects. It is most commonly used for conveniently storing and passing pairs of objects.

Standards<ToolKit>


  
#include <utility>

template< class T1, class T2 >
struct pair


  pair< T1, T2 >
make_pair( const T1& x, const T2& y );

Constructor

pair()

Constructs a pair that contains default instances of T1 and T2 .

Constructor

pair( const T1& a , const T2& b )

Constructs a pair that contains a copy of a as the first item and a copy of b as the second item.

first

first

The pair's first item. This is a public data member, not a function.

second

second

The pair's second item. This is a public data member, not a function.

bool operator==( const pair< T1, T2 >& x , const pair< T1, T2 >& y )

Returns true if ( x . first == y . first ) and ( x .


    second ==

y . second ). This is a templatized non-member function.

bool operator<( const pair< T1, T2 >& x , const pair< T1, T2 >& y )

Returns true if x is lexicographically less than y . That is, ( x . first < y . first ) or ( x .


    first ==

y .

 first
    >&

x .

 second
    <

y . second ). This is a templatized non-member function.