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