xref: /trunk/main/bridges/inc/bridges/cpp_uno/shared/vtables.hxx (revision 914d351e5f5b84e4342a86d6ab8d4aca7308b9bd)

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 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
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 * KIND, either express or implied.  See the License for the
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#ifndef INCLUDED_BRIDGES_CPP_UNO_SHARED_VTABLES_HXX
#define INCLUDED_BRIDGES_CPP_UNO_SHARED_VTABLES_HXX

#include "sal/types.h"
#include "typelib/typedescription.h"

namespace bridges { namespace cpp_uno { namespace shared {

/**
 * Calculate the number of local functions of an interface type.
 *
 * <p><em>Local</em> functions are those not inherited from any base types.  The
 * number of <em>functions</em> is potentially larger than the number of
 * <em>members</em>, as each read&ndash;write attribute member counts as two
 * functions.</p>
 *
 * @param type a non-null pointer to an interface type description, for which
 *     <code>typelib_typedescription_complete</code> must already have been
 *     executed
 * @return the number of local functions of the given interface type
 */
sal_Int32 getLocalFunctions(typelib_InterfaceTypeDescription const * type);

/**
 * Calculate the number of primary functions of an interface type.
 *
 * <p>The number of primary functions of an interface is the number of local
 * functions of that interface (see <code>getLocalFunctions</code>), plus the
 * number of primary functions of that interface's first base type (if it has at
 * least one base type).</p>
 *
 * @param type a pointer to an interface type description; may be null
 * @return the number of primary functions of the given interface type, or zero
 *     if the given interface type is null
 */
sal_Int32 getPrimaryFunctions(typelib_InterfaceTypeDescription * type);

/**
 * Represents a vtable slot of a C++ class.
 */
struct VtableSlot {
    /**
     * The offset of the vtable.
     *
     * <p>Multiple-inheritance C++ classes have more than one vtable.  The
     * offset is logical (<em>not</em> a byte offset), and must be
     * non-negative.</p>
     */
    sal_Int32 offset;

    /**
     * The index within the vtable.
     *
     * <p>The index is logical (<em>not</em> a byte offset), and must be
     * non-negative.</p>
     */
    sal_Int32 index;
};

/**
 * Calculates the vtable slot associated with an interface attribute member.
 *
 * @param ifcMember a non-null pointer to an interface attribute member
 *     description
 * @return the vtable slot associated with the given interface member
 */
VtableSlot getVtableSlot(
    typelib_InterfaceAttributeTypeDescription const * ifcMember);

/**
 * Calculates the vtable slot associated with an interface method member.
 *
 * @param ifcMember a non-null pointer to an interface method member description
 * @return the vtable slot associated with the given interface member
 */
VtableSlot getVtableSlot(
    typelib_InterfaceMethodTypeDescription const * ifcMember);

} } }

#endif