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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_UnlimitedContainer_H
53 #define Patternist_UnlimitedContainer_H
56 #include <private/qexpression_p.h>
57 #include <private/qgenericsequencetype_p.h>
66 * @short Base class for expressions that has any amount of operands.
68 * @author Frans Englich <frans.englich@nokia.com>
69 * @ingroup Patternist_expressions
71 class UnlimitedContainer : public Expression
75 * Creates an UnlimitedContainer containing the operands @p operands. @p operands
78 UnlimitedContainer(const Expression::List &operands = Expression::List());
80 virtual void setOperands(const Expression::List &list);
82 virtual Expression::List operands() const;
85 * @note This function cannot be called before setOperands is called.
87 virtual bool compressOperands(const StaticContext::Ptr &);
90 * Tells how operandsUnionType() should compute the cardinality of
93 * This type is public because of a bug in the HP-UX aCC compiler.
95 enum CardinalityComputation
103 * Computes and returns the union type of all the Expression instances
104 * in this Expression's operands.
106 * This implementation is placed inside because CardinalityComputation
107 * can't be referenced from the outside(in conforming compilers).
109 template<CardinalityComputation suppliedCard>
111 SequenceType::Ptr operandsUnionType() const
113 Q_ASSERT(suppliedCard == ProductOfCardinality || suppliedCard == UnionOfCardinality);
114 const Expression::List::const_iterator end(m_operands.constEnd());
115 Expression::List::const_iterator it(m_operands.constBegin());
117 /* Load the first one, and jump over it in the loop. */
118 SequenceType::Ptr t(m_operands.first()->staticType());
119 ItemType::Ptr type(t->itemType());
120 Cardinality card(t->cardinality());
123 for(; it != end; ++it)
125 t = (*it)->staticType();
126 type |= t->itemType();
128 /* Since this function is a template function, it doesn't
129 * hurt performance that this test is inside the loop. */
130 if(suppliedCard == ProductOfCardinality)
131 card += t->cardinality();
133 card |= t->cardinality();
136 return makeGenericSequenceType(type, card);
139 Expression::List m_operands;