williamr@2: /* boost random/detail/ptr_helper.hpp header file williamr@2: * williamr@2: * Copyright Jens Maurer 2002 williamr@2: * Distributed under the Boost Software License, Version 1.0. (See williamr@2: * accompanying file LICENSE_1_0.txt or copy at williamr@2: * http://www.boost.org/LICENSE_1_0.txt) williamr@2: * williamr@2: * See http://www.boost.org for most recent version including documentation. williamr@2: * williamr@2: * $Id: ptr_helper.hpp,v 1.3 2004/07/27 03:43:32 dgregor Exp $ williamr@2: * williamr@2: */ williamr@2: williamr@2: #ifndef BOOST_RANDOM_DETAIL_PTR_HELPER_HPP williamr@2: #define BOOST_RANDOM_DETAIL_PTR_HELPER_HPP williamr@2: williamr@2: #include <boost/config.hpp> williamr@2: williamr@2: williamr@2: namespace boost { williamr@2: namespace random { williamr@2: namespace detail { williamr@2: williamr@2: // type_traits could help here, but I don't want to depend on type_traits. williamr@2: template<class T> williamr@2: struct ptr_helper williamr@2: { williamr@2: typedef T value_type; williamr@2: typedef T& reference_type; williamr@2: typedef const T& rvalue_type; williamr@2: static reference_type ref(T& r) { return r; } williamr@2: static const T& ref(const T& r) { return r; } williamr@2: }; williamr@2: williamr@2: #ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION williamr@2: template<class T> williamr@2: struct ptr_helper<T&> williamr@2: { williamr@2: typedef T value_type; williamr@2: typedef T& reference_type; williamr@2: typedef T& rvalue_type; williamr@2: static reference_type ref(T& r) { return r; } williamr@2: static const T& ref(const T& r) { return r; } williamr@2: }; williamr@2: williamr@2: template<class T> williamr@2: struct ptr_helper<T*> williamr@2: { williamr@2: typedef T value_type; williamr@2: typedef T& reference_type; williamr@2: typedef T* rvalue_type; williamr@2: static reference_type ref(T * p) { return *p; } williamr@2: static const T& ref(const T * p) { return *p; } williamr@2: }; williamr@2: #endif williamr@2: williamr@2: } // namespace detail williamr@2: } // namespace random williamr@2: } // namespace boost williamr@2: williamr@2: // williamr@2: // BOOST_RANDOM_PTR_HELPER_SPEC -- williamr@2: // williamr@2: // Helper macro for broken compilers defines specializations of williamr@2: // ptr_helper. williamr@2: // williamr@2: #ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION williamr@2: # define BOOST_RANDOM_PTR_HELPER_SPEC(T) \ williamr@2: namespace boost { namespace random { namespace detail { \ williamr@2: template<> \ williamr@2: struct ptr_helper<T&> \ williamr@2: { \ williamr@2: typedef T value_type; \ williamr@2: typedef T& reference_type; \ williamr@2: typedef T& rvalue_type; \ williamr@2: static reference_type ref(T& r) { return r; } \ williamr@2: static const T& ref(const T& r) { return r; } \ williamr@2: }; \ williamr@2: \ williamr@2: template<> \ williamr@2: struct ptr_helper<T*> \ williamr@2: { \ williamr@2: typedef T value_type; \ williamr@2: typedef T& reference_type; \ williamr@2: typedef T* rvalue_type; \ williamr@2: static reference_type ref(T * p) { return *p; } \ williamr@2: static const T& ref(const T * p) { return *p; } \ williamr@2: }; \ williamr@2: }}} williamr@2: #else williamr@2: # define BOOST_RANDOM_PTR_HELPER_SPEC(T) williamr@2: #endif williamr@2: williamr@2: #endif // BOOST_RANDOM_DETAIL_PTR_HELPER_HPP