Thomas Geymayer
ceae2928aa
Using template parameter dependent name lookup it is now possible to create to_nasal_helper overloads for custom types and having them used for automatic type conversion with binding methods/member on nasal::Ghost objects.
69 lines
2.0 KiB
C++
69 lines
2.0 KiB
C++
///@file
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/// Conversion functions to convert Nasal types to C++ types
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///
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// Copyright (C) 2012 Thomas Geymayer <tomgey@gmail.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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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 GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
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#ifndef SG_FROM_NASAL_HXX_
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#define SG_FROM_NASAL_HXX_
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#include <simgear/nasal/cppbind/detail/from_nasal_helper.hxx>
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namespace nasal
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{
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/**
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* Convert a Nasal type to any supported C++ type.
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*
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* @param c Active Nasal context
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* @param ref Nasal object to be converted
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* @tparam T Target type of conversion
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*
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* @throws bad_nasal_cast if conversion is not possible
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*
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* @note Every type which should be supported needs a function with the
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* following signature declared:
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*
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* Type from_nasal_helper(naContext, naRef, Type*)
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*/
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template<class T>
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T from_nasal(naContext c, naRef ref)
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{
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return from_nasal_helper(c, ref, static_cast<T*>(0));
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}
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/**
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* Get pointer to specific version of from_nasal, converting to a type
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* compatible to Var.
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*/
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template<class Var>
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struct from_nasal_ptr
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{
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typedef typename boost::remove_const
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< typename boost::remove_reference<Var>::type
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>::type return_type;
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typedef return_type(*type)(naContext, naRef);
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static type get()
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{
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return &from_nasal<return_type>;
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}
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};
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} // namespace nasal
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#endif /* SG_FROM_NASAL_HXX_ */
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