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94 lines
2.9 KiB
94 lines
2.9 KiB
/* boost random/detail/ptr_helper.hpp header file |
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* |
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* Copyright Jens Maurer 2002 |
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* Distributed under the Boost Software License, Version 1.0. (See |
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* accompanying file LICENSE_1_0.txt or copy at |
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* http://www.boost.org/LICENSE_1_0.txt) |
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* |
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* See http://www.boost.org for most recent version including documentation. |
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* |
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* $Id: ptr_helper.hpp 24096 2004-07-27 03:43:34Z dgregor $ |
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* |
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*/ |
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#ifndef BOOST_RANDOM_DETAIL_PTR_HELPER_HPP |
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#define BOOST_RANDOM_DETAIL_PTR_HELPER_HPP |
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#include <boost/config.hpp> |
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namespace boost { |
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namespace random { |
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namespace detail { |
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// type_traits could help here, but I don't want to depend on type_traits. |
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template<class T> |
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struct ptr_helper |
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{ |
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typedef T value_type; |
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typedef T& reference_type; |
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typedef const T& rvalue_type; |
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static reference_type ref(T& r) { return r; } |
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static const T& ref(const T& r) { return r; } |
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}; |
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#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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template<class T> |
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struct ptr_helper<T&> |
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{ |
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typedef T value_type; |
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typedef T& reference_type; |
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typedef T& rvalue_type; |
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static reference_type ref(T& r) { return r; } |
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static const T& ref(const T& r) { return r; } |
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}; |
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template<class T> |
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struct ptr_helper<T*> |
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{ |
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typedef T value_type; |
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typedef T& reference_type; |
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typedef T* rvalue_type; |
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static reference_type ref(T * p) { return *p; } |
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static const T& ref(const T * p) { return *p; } |
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}; |
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#endif |
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} // namespace detail |
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} // namespace random |
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} // namespace boost |
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// |
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// BOOST_RANDOM_PTR_HELPER_SPEC -- |
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// |
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// Helper macro for broken compilers defines specializations of |
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// ptr_helper. |
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// |
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#ifdef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION |
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# define BOOST_RANDOM_PTR_HELPER_SPEC(T) \ |
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namespace boost { namespace random { namespace detail { \ |
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template<> \ |
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struct ptr_helper<T&> \ |
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{ \ |
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typedef T value_type; \ |
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typedef T& reference_type; \ |
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typedef T& rvalue_type; \ |
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static reference_type ref(T& r) { return r; } \ |
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static const T& ref(const T& r) { return r; } \ |
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}; \ |
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\ |
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template<> \ |
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struct ptr_helper<T*> \ |
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{ \ |
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typedef T value_type; \ |
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typedef T& reference_type; \ |
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typedef T* rvalue_type; \ |
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static reference_type ref(T * p) { return *p; } \ |
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static const T& ref(const T * p) { return *p; } \ |
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}; \ |
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}}} |
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#else |
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# define BOOST_RANDOM_PTR_HELPER_SPEC(T) |
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#endif |
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#endif // BOOST_RANDOM_DETAIL_PTR_HELPER_HPP
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