?? forwardparam.hpp
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/* The following code example is taken from the book * "C++ Templates - The Complete Guide" * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002 * * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002. * Permission to copy, use, modify, sell and distribute this software * is granted provided this copyright notice appears in all copies. * This software is provided "as is" without express or implied * warranty, and with no claim as to its suitability for any purpose. */#ifndef FORWARD_HPP#define FORWARD_HPP#include "ifthenelse.hpp"#include "typet.hpp"#include "typeop.hpp"// ForwardParamT<T>::Type is// - constant reference for class types// - plain type for almost all other types// - a dummy type (Unused) for type voidtemplate<typename T>class ForwardParamT { public: typedef typename IfThenElse<TypeT<T>::IsClassT, typename TypeOp<T>::RefConstT, typename TypeOp<T>::ArgT >::ResultT Type;};template<>class ForwardParamT<void> { private: class Unused {}; public: typedef Unused Type;};#endif // FORWARD_HPP
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