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< td align = "right" valign = "center" > < img src = "logo32.png" align = "right" width = "64" height = "32" border = "0" > < / td > < / tr > < / table > < h1 align = center > TQPair Class Reference< / h1 >
< p > The TQPair class is a value-based template class that provides a pair of elements.
< a href = "#details" > More...< / a >
< p > < tt > #include < < a href = "qpair-h.html" > ntqpair.h< / a > > < / tt >
< p > < a href = "qpair-members.html" > List of all member functions.< / a >
< h2 > Public Members< / h2 >
< ul >
< li class = fn > typedef T1 < a href = "#first_type" > < b > first_type< / b > < / a > < / li >
< li class = fn > typedef T2 < a href = "#second_type" > < b > second_type< / b > < / a > < / li >
< li class = fn > < a href = "#TQPair" > < b > TQPair< / b > < / a > ()< / li >
< li class = fn > < a href = "#TQPair-2" > < b > TQPair< / b > < / a > ( const T1 & t1, const T2 & t2 )< / li >
< li class = fn > TQPair< T1, T2> & < b > operator=< / b > ( const TQPair< T1, T2> & other )< / li >
< / ul >
< h2 > Related Functions< / h2 >
< ul >
< li class = fn > TQPair < a href = "#qMakePair" > < b > qMakePair< / b > < / a > ( T1 t1, T2 t2 )< / li >
< / ul >
< hr > < a name = "details" > < / a > < h2 > Detailed Description< / h2 >
The TQPair class is a value-based template class that provides a pair of elements.
< p >
< p > TQPair is a TQt implementation of an STL-like pair. It can be used
in your application if the standard pair< > is not available on
your target platforms.
< p > TQPair< T1, T2> defines a template instance to create a pair of
values that contains two values of type T1 and T2. Please note
that TQPair does not store pointers to the two elements; it holds a
copy of every member. This is why these kinds of classes are
called < em > value based< / em > . If you're interested in < em > pointer based< / em >
classes see, for example, < a href = "ntqptrlist.html" > TQPtrList< / a > and < a href = "ntqdict.html" > TQDict< / a > .
< p > TQPair holds one copy of type T1 and one copy of type T2, but does
not provide iterators to access these elements. Instead, the two
elements (< tt > first< / tt > and < tt > second< / tt > ) are public member variables of
the pair. TQPair owns the contained elements. For more relaxed
ownership semantics, see < a href = "ntqptrcollection.html" > TQPtrCollection< / a > and friends which are
pointer-based containers.
< p > Some classes cannot be used within a TQPair: for example, all
classes derived from < a href = "tqobject.html" > TQObject< / a > and thus all classes that implement
widgets. Only "values" can be used in a TQPair. To qualify as a
value the class must provide:
< p > < ul >
< li > A copy constructor
< li > An assignment operator
< li > A constructor that takes no arguments
< / ul >
< p > Note that C++ defaults to field-by-field assignment operators and
copy constructors if no explicit version is supplied. In many
cases this is sufficient.
< p > TQPair uses an STL-like syntax to manipulate and address the
objects it contains. See the < a href = "ntqtl.html" > TQTL
documentation< / a > for more information.
< p > Functions that need to return two values can use a TQPair.
< p > See also < a href = "ntqtl.html" > TQt Template Library Classes< / a > , < a href = "shared.html" > Implicitly and Explicitly Shared Classes< / a > , and < a href = "tools.html" > Non-GUI Classes< / a > .
< hr > < h2 > Member Type Documentation< / h2 >
< h3 class = fn > < a name = "first_type" > < / a > TQPair::first_type< / h3 >
The type of the first element in the pair.
< h3 class = fn > < a name = "second_type" > < / a > TQPair::second_type< / h3 >
The type of the second element in the pair.
< hr > < h2 > Member Function Documentation< / h2 >
< h3 class = fn > < a name = "TQPair" > < / a > TQPair::TQPair ()
< / h3 >
< p > Constructs an empty pair. The < tt > first< / tt > and < tt > second< / tt > elements are
default constructed.
< h3 class = fn > < a name = "TQPair-2" > < / a > TQPair::TQPair ( const T1 & t1, const T2 & t2 )
< / h3 >
< p > Constructs a pair and initializes the < tt > first< / tt > element with < em > t1< / em >
and the < tt > second< / tt > element with < em > t2< / em > .
< hr > < h2 > Related Functions< / h2 >
< h3 class = fn > < a href = "ntqpair.html" > TQPair< / a > < a name = "qMakePair" > < / a > qMakePair ( T1 t1, T2 t2 )
< / h3 >
< p >
< p > This is a template convenience function. It is used to create a
TQPair< > object that contains < em > t1< / em > and < em > t2< / em > .
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