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// file : odb/view-result.hxx
// copyright : Copyright (c) 2009-2017 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_VIEW_RESULT_HXX
#define ODB_VIEW_RESULT_HXX
#include <odb/pre.hxx>
#include <cstddef> // std::ptrdiff_t, std::size_t
#include <iterator> // iterator categories
#include <utility> // std::move
#include <odb/forward.hxx>
#include <odb/traits.hxx>
#include <odb/result.hxx>
#include <odb/pointer-traits.hxx>
#include <odb/details/config.hxx> // ODB_CXX11
namespace odb
{
template <typename T>
class view_result_impl: public result_impl
{
protected:
friend class result<T>;
friend class result<const T>;
friend class result_iterator<T, class_view>;
friend class result_iterator<const T, class_view>;
// In result_impl, T is always non-const and the same as view_type.
//
typedef T view_type;
typedef odb::view_traits<view_type> view_traits;
typedef typename view_traits::pointer_type pointer_type;
typedef odb::pointer_traits<pointer_type> pointer_traits;
view_result_impl (odb::connection& conn)
: result_impl (conn), begin_ (true), end_ (false), current_ ()
{
}
// To make this work with all kinds of pointers (raw, std::auto_ptr,
// shared), we need to make sure we don't make any copies of the
// pointer on the return path.
//
pointer_type&
current ();
void
release ()
{
current_ = pointer_type ();
guard_.release ();
}
void
begin ()
{
if (begin_)
{
next ();
begin_ = false;
}
}
bool
end () const
{
return end_;
}
protected:
virtual void
load (view_type&) = 0;
virtual void
next () = 0;
virtual void
cache () = 0;
virtual std::size_t
size () = 0;
protected:
#ifdef ODB_CXX11
void
current (pointer_type& p)
{
current_ = std::move (p);
guard_.reset (current_);
}
void
current (pointer_type&& p)
{
current (p);
}
#else
void
current (pointer_type p)
{
current_ = p;
guard_.reset (current_);
}
#endif
bool begin_;
bool end_;
private:
pointer_type current_;
typename pointer_traits::guard guard_;
};
template <typename T>
class result_iterator<T, class_view>
{
public:
typedef T value_type;
typedef value_type& reference;
typedef value_type* pointer;
typedef std::ptrdiff_t difference_type;
typedef std::input_iterator_tag iterator_category;
// T can be const T while view_type is always non-const.
//
typedef typename view_traits<T>::view_type view_type;
typedef view_result_impl<view_type> result_impl_type;
public:
explicit
result_iterator (result_impl_type* res = 0)
: res_ (res)
{
}
// Input iterator requirements.
//
public:
reference
operator* () const
{
return pointer_traits::get_ref (res_->current ());
}
// Our value_type is already a pointer so return it instead of
// a pointer to it (operator-> will just have to go one deeper
// in the latter case).
//
pointer
operator-> () const
{
return pointer_traits::get_ptr (res_->current ());
}
result_iterator&
operator++ ()
{
res_->next ();
return *this;
}
result_iterator
operator++ (int)
{
// All non-end iterators for a result object move together.
//
res_->next ();
return *this;
}
public:
typedef typename view_traits<T>::pointer_type pointer_type;
pointer_type
load ()
{
#ifdef ODB_CXX11
pointer_type r (std::move (res_->current ()));
#else
pointer_type r (res_->current ());
#endif
res_->release ();
return r;
}
void
load (view_type&);
public:
bool
equal (result_iterator j) const
{
return (res_ ? res_->end () : true) == (j.res_ ? j.res_->end () : true);
}
private:
// Use unrestricted pointer traits since that's what is returned by
// result_impl.
//
typedef
odb::pointer_traits<typename view_traits<view_type>::pointer_type>
pointer_traits;
result_impl_type* res_;
};
//
//
template <typename T>
class result_base<T, class_view>
{
public:
typedef typename view_traits<T>::pointer_type value_type;
// T can be const T while view_type is always non-const.
//
typedef typename view_traits<T>::view_type view_type;
typedef view_result_impl<view_type> result_impl_type;
};
}
#include <odb/view-result.txx>
#include <odb/post.hxx>
#endif // ODB_VIEW_RESULT_HXX
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