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46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_Aggregator_H
53 #define Patternist_Aggregator_H
55 #include <private/qfunctioncall_p.h>
65 * @short Carries a staticType() implementation appropriate
66 * for functions which returns a singleton value derived from its first argument.
68 * One example of such a function is FloorFN, implementing <tt>fn:floor()</tt>,
69 * which returns a single value of the same type as the first argument, or the empty
70 * sequence if the first argument evaluates to the empty sequence.
72 * Aggregator is abstract, and exists for saving code. It is inherited
73 * by classes which needs the staticType() implementation this class provides.
76 * @ingroup Patternist_functions
77 * @author Frans Englich <frans.englich@nokia.com>
79 class Aggregator : public FunctionCall
83 * @returns a static type where the ItemType is the same as this FunctionCall's first
84 * argument, and the Cardinality is as return from Cardinality::toWithoutMany().
86 virtual SequenceType::Ptr staticType() const;