95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
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/* 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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