_ref_wrap.h

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// -*- C++ -*-
 
#ifndef _RWSTD_RW_REF_WRAP_INCLUDED
#  define _RWSTD_RW_REF_WRAP_INCLUDED
 
#  include <rw/_defs.h>
 
 
_RWSTD_NAMESPACE (std) {
 
 
// 20.5.5, class template reference_wrapper:
 
template <class _TypeT>
class reference_wrapper
{
    _TypeT* _C_ptr;
 
public:
 
    typedef _TypeT  type;
 
    reference_wrapper (type& __x)
        : _C_ptr (&__x) { /* empty */ }
 
    reference_wrapper (const reference_wrapper& __x)
        : _C_ptr (__x._C_ptr) { /* empty */ }
 
    reference_wrapper& operator= (const reference_wrapper& __x) {
        _RWSTD_ASSERT (0 != __x._C_ptr);
        _C_ptr = __x._C_ptr;
        return *this;
    }
 
    operator type& () const {
        _RWSTD_ASSERT (0 != _C_ptr);
        return *_C_ptr;
    }
 
    type& get() const {
        _RWSTD_ASSERT (0 != _C_ptr);
        return *_C_ptr;
    }
};
 
 
template <class _TypeT>
inline reference_wrapper<_TypeT>
ref (_TypeT& __x)
{
    return reference_wrapper<_TypeT> (__x);
}
 
template <class _TypeT>
inline reference_wrapper<_TypeT>
ref (reference_wrapper<_TypeT>& __x)
{
    return reference_wrapper<_TypeT> (__x);
}
 
 
template <class _TypeT>
inline reference_wrapper<const _TypeT>
cref (const _TypeT& __x)
{
    return reference_wrapper<const _TypeT> (__x);
}
 
template <class _TypeT>
inline reference_wrapper<const _TypeT>
cref (reference_wrapper<const _TypeT>& __x)
{
    return reference_wrapper<const _TypeT> (__x);
}
 
 
}   // namespace std
 
 
#endif   // _RWSTD_RW_REF_WRAP_INCLUDED