/usr/include/camp/valuevisitor.hpp is in libcamp-dev 0.8.1-2.
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**
** Copyright (C) 2009-2014 TEGESO/TEGESOFT and/or its subsidiary(-ies) and mother company.
** Contact: Tegesoft Information (contact@tegesoft.com)
**
** This file is part of the CAMP library.
**
** The MIT License (MIT)
**
** Copyright (C) 2009-2014 TEGESO/TEGESOFT and/or its subsidiary(-ies) and mother company.
**
** Permission is hereby granted, free of charge, to any person obtaining a copy
** of this software and associated documentation files (the "Software"), to deal
** in the Software without restriction, including without limitation the rights
** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
** copies of the Software, and to permit persons to whom the Software is
** furnished to do so, subject to the following conditions:
**
** The above copyright notice and this permission notice shall be included in
** all copies or substantial portions of the Software.
**
** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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****************************************************************************/
#ifndef CAMP_VALUEVISITOR_HPP
#define CAMP_VALUEVISITOR_HPP
#ifndef Q_MOC_RUN
#include <boost/variant/static_visitor.hpp>
#endif
namespace camp
{
/**
* \brief Base class for writing custom Value visitors
*
* A value visitor acts like compile-time dispatchers which automatically
* calls the function which matches the actual type of the stored value.
* This is a more direct and straight-forward approach than using a runtime switch,
* based on value.type() and then converting to the proper type.
* It also gives access to enum and user objects, which can give useful informations with
* no knowledge about the actual C++ class or enum.
*
* The template parameter T is the type returned by the visitor.
*
* To handle one of the possible types of the value, just write the corresponding \c operator() function.
* Here is the list of the mapping between CAMP types and their corresponding C++ types:
*
* \li camp::noType --> camp::NoType
* \li camp::boolType --> bool
* \li camp::intType --> long
* \li camp::realType --> double
* \li camp::stringType --> std::string
* \li camp::enumType --> camp::EnumObject
* \li camp::userType --> camp::UserObject
*
* Here an example of a unary visitor which creates an editor for the value based on its type
* \code
* struct EditorFactory : public ValueVisitor<PropertyEditor*>
* {
* PropertyEditor* operator()(bool value)
* {
* return new BooleanEditor(value);
* }
*
* PropertyEditor* operator()(long value)
* {
* return new IntegerEditor(value);
* }
*
* PropertyEditor* operator()(double value)
* {
* return new RealEditor(value);
* }
*
* PropertyEditor* operator()(const std::string& value)
* {
* return new StringEditor(value);
* }
*
* PropertyEditor* operator()(const camp::EnumObject& value)
* {
* return new EnumEditor(value);
* }
*
* PropertyEditor* operator()(const camp::UserObject& value)
* {
* return new UserEditor(value);
* }
* };
*
* camp::Value value(5.4);
* PropertyEditor* editor = value.visit(EditorFactory());
* \endcode
*/
template <typename T = void>
class ValueVisitor : public boost::static_visitor<T>
{
};
} // namespace camp
#endif // CAMP_VALUEVISITOR_HPP
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