113 lines
4.2 KiB
C++
113 lines
4.2 KiB
C++
/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield
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*
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* This library is open source and may be redistributed and/or modified under
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* the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
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* (at your option) any later version. The full license is in LICENSE file
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* included with this distribution, and on the openscenegraph.org website.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* OpenSceneGraph Public License for more details.
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*/
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//osgIntrospection - Copyright (C) 2005 Marco Jez
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#ifndef OSGINTROSPECTION_REFLECTION_
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#define OSGINTROSPECTION_REFLECTION_
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#include <osgIntrospection/Export>
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#include <typeinfo>
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#include <map>
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#include <vector>
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/// This macro emulates the behavior of the standard typeid operator,
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/// returning the Type object associated to the type of the given
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/// expression.
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#define typeof(expr) osgIntrospection::Reflection::getType(typeid(expr))
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namespace osgIntrospection
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{
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class Type;
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struct Converter;
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typedef std::vector<const Converter* > ConverterList;
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/// This predicate compares two instances of std::type_info for equality.
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/// Note that we can't rely on default pointer comparison because it is
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/// not guaranteed that &typeid(T) always returns the same pointer for a
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/// given T (thanks Andrew Koenig).
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struct TypeInfoCmp
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{
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bool operator()(const std::type_info* t1, const std::type_info* t2) const
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{
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return t1->before(*t2) != 0;
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}
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};
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/// A map of types, indexed by their associated type_info structure.
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typedef std::map<const std::type_info* , Type* , TypeInfoCmp> TypeMap;
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/// This class provides basic reflection services such as registration
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/// of new types and queries on the global type map.
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class OSGINTROSPECTION_EXPORT Reflection
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{
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public:
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/// Returns the Type object associated to the given type_info
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/// structure. If the type hasn't been created yet it is
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/// automatically created and added to the global type map.
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/// Please note that such type will have the status of
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/// "declared", you still need to give details about it through
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/// a Reflector class before you can query it.
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static const Type& getType(const std::type_info& ti);
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/// Finds a Type object given its qualified name, which must
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/// be identical to the qualified name returned by that Type's
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/// getQualifiedName() method. If the type hasn't been created
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/// yet, an exception is thrown.
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static const Type& getType(const std::string& qname);
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/// Returns the global map of types.
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static const TypeMap& getTypes();
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/// Return the Type object associated to the C++ type 'void'.
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/// This is a shortcut for typeof(void), which may be slow if
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/// the type map is large.
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static const Type& type_void();
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static const Converter* getConverter(const Type& source, const Type& dest);
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static bool getConversionPath(const Type& source, const Type& dest, ConverterList& conv);
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private:
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template<typename C> friend class Reflector;
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template<typename C> friend struct TypeNameAliasProxy;
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friend struct ConverterProxy;
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struct StaticData
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{
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TypeMap typemap;
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const Type* type_void;
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typedef std::map<const Type* , const Converter* > ConverterMap;
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typedef std::map<const Type* , ConverterMap> ConverterMapMap;
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ConverterMapMap convmap;
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~StaticData();
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};
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static StaticData& getOrCreateStaticData();
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static Type* registerType(const std::type_info& ti);
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static Type* getOrRegisterType(const std::type_info& ti, bool replace_if_defined = false);
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static void registerConverter(const Type& source, const Type& dest, const Converter* cvt);
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private:
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static bool accum_conv_path(const Type& source, const Type& dest, ConverterList& conv, std::vector<const Type* > &chain);
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static StaticData* _static_data;
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};
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}
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#endif
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