source: trunk/src/xmlpatterns/functions/qfunctionsignature_p.h@ 987

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//
//  W A R N I N G
//  -------------
//
// This file is not part of the Qt API.  It exists purely as an
// implementation detail.  This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.

#ifndef Patternist_FunctionSignature_H
#define Patternist_FunctionSignature_H

template<typename Key, typename Value> class QHash;
template<typename T> class QList;

#include <QSharedData>

#include "qcalltargetdescription_p.h"
#include "qexpression_p.h"
#include "qfunctionargument_p.h"
#include "qpatternistlocale_p.h"
#include "qprimitives_p.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{

    /**
     * @short Represents the signature of an XPath function.
     *
     * FunctionSignature represents and allows inspection of a function signature,
     * such as <tt>fn:string-join($arg1 as xs:string*, $arg2 as xs:string) as xs:string</tt>.
     * No XPath related languages allows polymorphism on the type of the arguments, only the
     * amount(arity) of the arguments. For example, <tt>fn:string() as xs:string</tt> and
     * <tt>fn:string($arg as item()?) as xs:string</tt> can happily co-exist, but
     * <tt>fn:string($arg as item()?) as xs:string</tt> and
     * <tt>fn:string($arg as xs:anyAtomicType?) as xs:string</tt> would be an error. This
     * fact is reflected by FunctionSignature that if minimumArguments() and maximumArguments()
     * are not equal, it means that this FunctionSignature represents several
     * function signatures.
     *
     * @ingroup Patternist_functions
     * @see <a href="http://www.w3.org/TR/xpath-functions/#func-signatures">XQuery 1.0 and
     * XPath 2.0 Functions and Operators, 1.4 Function Signatures and Descriptions</a>
     * @see <a href="http://en.wikipedia.org/wiki/Arity">Wikipedia, the free encyclopedia, Arity</a>
     * @author Frans Englich <[email protected]>
     */
    class Q_AUTOTEST_EXPORT FunctionSignature : public CallTargetDescription
    {
    public:
        enum
        {
            /**
             * Flags the function as allowing an unlimited amount of arguments.
             */