_rawiter.h

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// -*- C++ -*-
 
#ifndef _RWSTD_RW_RAWITER_H_INCLUDED
#define _RWSTD_RW_RAWITER_H_INCLUDED
 
#ifndef _RWSTD_ITERBASE_H_INCLUDED
#  include <rw/_iterbase.h>
#endif   // _RWSTD_ITERBASE_H_INCLUDED
 
#ifndef _RWSTD_RW_NEW_H_INCLUDED
#  include <rw/_new.h>
#endif   // _RWSTD_RW_NEW_H_INCLUDED
 
#ifndef _RWSTD_RW_PAIR_H_INCLUDED
#  include <rw/_pair.h>
#endif   // _RWSTD_RW_PAIR_H_INCLUDED
 
 
_RWSTD_NAMESPACE (std) {
 
 
// 20.4.2
template <class _OutputIterator, class _TypeT>
class raw_storage_iterator
    : public iterator<output_iterator_tag, void, void, void, void>
{
    _OutputIterator _C_iter;
public:
 
    // for completeness and genericity
    typedef _OutputIterator iterator_type;
 
    // 20.4.2, p2
    explicit raw_storage_iterator (iterator_type __x): _C_iter (__x) { }
 
    // 20.4.2, p3
    raw_storage_iterator& operator* () {
        return *this;
    }
 
    // 20.4.2, p4
    raw_storage_iterator& operator= (const _TypeT& __rhs) {
        ::new (&(*_C_iter)) _TypeT (__rhs);
        return *this;
    }
 
    // 20.4.2, p6
    raw_storage_iterator& operator++ () {
        return ++_C_iter, *this;
    }
 
    // 20.4.2, p7
    raw_storage_iterator operator++ (int) {
        const raw_storage_iterator __tmp = *this;
        return ++*this, __tmp;
    }
};
 
 
}   // namespace std
 
 
_RWSTD_NAMESPACE (__rw) {
 
extern "C" {
 
// [de]allocates a previously allocated temporary buffer
// the constant _RWSTD_TMPBUF_SIZE controls the size of a static buffer
// if request for area larger than _RWSTD_TMPBUF_SIZE comes in, space
// is allocated dynamically, otherwise the static buffer is used
// return value meaningful only when allocating
_RWSTD_EXPORT _RWSTD_SIZE_T
__rw_tmpbuf (void**, _RWSTD_PTRDIFF_T, _RWSTD_SIZE_T);
 
}
 
}   // namespace __rw
 
 
_RWSTD_NAMESPACE (std) {
 
 
// 20.4.3 only specifies a get_temporary_buffer<>() that takes a ptrdiff_t.
// We overload on all types so that signed integral types other than ptrdiff_t
// can be used. This is important in getting algorithms to compile with
// user-defined iterators (not derived from iterator<...>) whose difference
// type is something other than ptrdiff_t.
 
// having this overload is important in some cases for compilers that
// do not support partial class specialization (and where as a consequence
// iterator_traits<> isn't available)
template <class _TypeT, class _Distance>
inline pair<_TypeT*, _Distance>
get_temporary_buffer (_Distance __nelems, _TypeT*)
{
    pair<_TypeT*, _Distance> __res (0, 0);
 
#if __GNUG__ >= 4
 
    // tell gcc 4 about type-punning in the cast below
    typedef void* __attribute__ ((__may_alias__)) _VoidPtrT;
 
#else   // !gcc || gcc < 4
 
    typedef void* _VoidPtrT;
 
#endif   // gcc
 
    __res.second =
        _RW::__rw_tmpbuf (_RWSTD_REINTERPRET_CAST (_VoidPtrT*, &__res.first),
                          __nelems < 0 ? 0 : __nelems, sizeof (_TypeT));
 
    return __res;
}
 
 
#ifndef _RWSTD_NO_TEMPLATE_ON_RETURN_TYPE
 
// 20.4.3, p1
template <class _TypeT>
inline pair<_TypeT*, _RWSTD_PTRDIFF_T>
get_temporary_buffer (_RWSTD_PTRDIFF_T __n)
{
    return get_temporary_buffer (__n, (_TypeT*)0);
}
 
#endif   // _RWSTD_NO_TEMPLATE_ON_RETURN_TYPE
 
 
// 20.4.3, p3
template <class _TypeT>
inline void
return_temporary_buffer (_TypeT *__p)
{
#if __GNUG__ >= 4
 
    // tell gcc 4 about type-punning in the cast below
    typedef void* __attribute__ ((__may_alias__)) _VoidPtrT;
 
#else   // !gcc || gcc < 4
 
    typedef void* _VoidPtrT;
 
#endif   // gcc
 
    _RW::__rw_tmpbuf (_RWSTD_REINTERPRET_CAST (_VoidPtrT*, &__p),
                      0, sizeof (_TypeT));
}
 
 
}   // namespace std
 
 
#endif   // _RWSTD_RW_RAWITER_H_INCLUDED