1/************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 21 22 23#ifndef __com_sun_star_beans_Optional_idl__ 24#define __com_sun_star_beans_Optional_idl__ 25 26module com { module sun { module star { module beans { 27 28/** 29 An optional value of a given type. 30 31 <p>This structure is used as the type of interface attributes corresponding 32 to instances of <type scopye="com::sun::star::beans">Property</type> that 33 have the <const 34 scope="com::sun::star::beans">PropertyAttribute::MAYBEVOID</const>. It might 35 also be useful in other situations, for example as the return type of an 36 interface method.</p> 37 */ 38published struct Optional<T> { 39 /** 40 Marks this structure instance as having an actual value. 41 */ 42 boolean IsPresent; 43 44 /** 45 The actual value of this structure instance. 46 47 <p>If no actual value is present, a producer of such a structure instance 48 should leave this member defaulted, and a consumer of such a structure 49 instance should ignore the specific value stored in this member.</p> 50 */ 51 T Value; 52}; 53 54}; }; }; }; 55 56#endif 57