VMS Help CXXLSTD, Operators, pair *Conan The Librarian |
Standard C++ Library Copyright 1996, Rogue Wave Software, Inc. NAME pair - A template for heterogeneous pairs of values. SYNOPSIS #include <utility> template <class T1, class T2> struct pair ; DESCRIPTION The pair class provides a template for encapsulating pairs of values that may be of different types. INTERFACE template <class T1, class T2> struct pair { T1 first; T2 second; pair(); pair (const T1&, const T2&); ~pair(); }; template <class T1, class T2> bool operator== (const pair<T1, T2>&, const pair T1, T2>&); template <class T1, class T2> bool operator!= (const pair<T1, T2>&, const pair T1, T2>&); template <class T1, class T2> bool operator< (const pair<T1, T2>&, const pair T1, T2>&); template <class T1, class T2> bool operator> (const pair<T1, T2>&, const pair T1, T2>&); template <class T1, class T2> bool operator<= (const pair<T1, T2>&, const pair T1, T2>&); template <class T1, class T2> bool operator>= (const pair<T1, T2>&, const pair T1, T2>&); template <class T1, class T2> pair<T1,T2> make_pair (const T1&, const T2&); CONSTRUCTORS AND DESTRUCTORS pair (); Default constructor. Initializes first and second using their default constructors. pair (const T1& x, const T2& y); The constructor creates a pair of types T1 and T2, making the necessary conversions in x and y. ~pair (); Destructor. NON-MEMBER OPERATORS template <class T1, class T2> bool operator== (const pair<T1, T2>& x, const pair T1, T2>& y); Returns true if (x.first == y.first && x.second == y.second) is true. Otherwise it returns false. template <class T1, class T2> bool operator!= (const pair<T1, T2>& x, const pair T1, T2>& y); Returns !(x==y). template <class T1, class T2> bool operator< (const pair<T1, T2>& x, const pair T1, T2>& y); Returns true if (x.first < y.first || (!(y.first < x.first) && x.second < y.second)) is true. Otherwise it returns false. template <class T1, class T2> bool operator> (const pair<T1, T2>& x, const pair T1, T2>& y); Returns y < x. template <class T1, class T2> bool operator<= (const pair<T1, T2>& x, const pair T1, T2>& y); Returns !(y < x). template <class T1, class T2> bool operator>= (const pair<T1, T2>& x, const pair T1, T2>& y); Returns !(x < y). NON-MEMBER FUNCTIONS template <class T1, class T2> pair<T1,T2> make_pair(x,y); make_pair(x,y) creates a pair by deducing and returning the types of x and y. STANDARDS CONFORMANCE ANSI X3J16/ISO WG21 Joint C++ Committee
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