TemplateConstructor.hpp
Go to the documentation of this file.00001 /*************************************************************************** 00002 tag: The SourceWorks Tue Sep 7 00:55:18 CEST 2010 TemplateConstructor.hpp 00003 00004 TemplateConstructor.hpp - description 00005 ------------------- 00006 begin : Tue September 07 2010 00007 copyright : (C) 2010 The SourceWorks 00008 email : peter@thesourceworks.com 00009 00010 *************************************************************************** 00011 * This library is free software; you can redistribute it and/or * 00012 * modify it under the terms of the GNU General Public * 00013 * License as published by the Free Software Foundation; * 00014 * version 2 of the License. * 00015 * * 00016 * As a special exception, you may use this file as part of a free * 00017 * software library without restriction. Specifically, if other files * 00018 * instantiate templates or use macros or inline functions from this * 00019 * file, or you compile this file and link it with other files to * 00020 * produce an executable, this file does not by itself cause the * 00021 * resulting executable to be covered by the GNU General Public * 00022 * License. This exception does not however invalidate any other * 00023 * reasons why the executable file might be covered by the GNU General * 00024 * Public License. * 00025 * * 00026 * This library is distributed in the hope that it will be useful, * 00027 * but WITHOUT ANY WARRANTY; without even the implied warranty of * 00028 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * 00029 * Lesser General Public License for more details. * 00030 * * 00031 * You should have received a copy of the GNU General Public * 00032 * License along with this library; if not, write to the Free Software * 00033 * Foundation, Inc., 59 Temple Place, * 00034 * Suite 330, Boston, MA 02111-1307 USA * 00035 * * 00036 ***************************************************************************/ 00037 00038 00039 #ifndef ORO_TEMPLATE_CONSTRUCTOR_HPP 00040 #define ORO_TEMPLATE_CONSTRUCTOR_HPP 00041 00042 #include "Types.hpp" 00043 #include "../internal/FusedFunctorDataSource.hpp" 00044 #include "../internal/CreateSequence.hpp" 00045 #include "../Logger.hpp" 00046 00047 #include <boost/type_traits/function_traits.hpp> 00048 #include <boost/function.hpp> 00049 00050 #include "../rtt-config.h" 00051 00052 namespace RTT 00053 { 00054 namespace types { 00062 template<class S> 00063 struct TemplateConstructor 00064 : public TypeConstructor 00065 { 00066 typedef typename boost::function_traits<S>::result_type result_type; 00067 typedef typename boost::function_traits<S>::arg1_type arg1_type; 00068 typedef internal::create_sequence<typename boost::function_types::parameter_types<S>::type> SequenceFactory; 00069 00070 boost::function<S> ff; 00071 bool automatic; 00072 00073 template<class FInit> 00074 TemplateConstructor( FInit f, bool autom) 00075 : ff(f), automatic(autom) 00076 {} 00077 00078 virtual base::DataSourceBase::shared_ptr build(const std::vector<base::DataSourceBase::shared_ptr>& args) const { 00079 // number of arguments must be exact. 00080 if ( args.size() != boost::function_traits<S>::arity ) 00081 return base::DataSourceBase::shared_ptr(); 00082 try { 00083 return new internal::FusedFunctorDataSource<S>(ff, SequenceFactory::sources(args.begin()) ); 00084 } catch(...) // wrong argument types 00085 {} 00086 return base::DataSourceBase::shared_ptr(); 00087 } 00088 00089 virtual base::DataSourceBase::shared_ptr convert(base::DataSourceBase::shared_ptr arg) const { 00090 if ( boost::function_traits<S>::arity != 1) { 00091 return base::DataSourceBase::shared_ptr(); 00092 } else { 00093 // The compiler should optimise this out... 00094 // these checks are necessary because produce(args) calls convert, which could lead to endless loops. 00095 // detect same type converion. 00096 if ( arg->getTypeInfo() == internal::DataSourceTypeInfo<result_type>::getTypeInfo() ) { 00097 return arg; 00098 } 00099 // detect invalid type conversion. 00100 if ( arg->getTypeInfo() != internal::DataSourceTypeInfo<arg1_type>::getTypeInfo() ) { 00101 return base::DataSourceBase::shared_ptr(); 00102 } 00103 // from now on, it should always succeed. 00104 std::vector<base::DataSourceBase::shared_ptr> args; 00105 args.push_back(arg); 00106 base::DataSourceBase::shared_ptr ret = this->build(args); 00107 assert( ret ); 00108 if (!automatic) 00109 log(Warning) << "Conversion from " << arg->getTypeName() << " to " << ret->getTypeName() <<endlog(); 00110 return ret; 00111 } 00112 } 00113 }; 00121 template<class Function> 00122 TypeConstructor* newConstructor( Function* foo, bool automatic = false ) { 00123 return new detail::TemplateConstructor<Function>(foo, automatic); 00124 } 00125 00134 template<class Object> 00135 TypeConstructor* newConstructor( Object obj, bool automatic = false) { 00136 return new detail::TemplateConstructor<typename Object::Signature>(obj, automatic); 00137 } 00138 }} 00139 00140 #endif