Initial commit

2017-04-11 15:49:21 +02:00
commit ec80b339e2
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+// file      : odb/view-result.hxx
+// copyright : Copyright (c) 2009-2015 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:
+    typename view_traits<T>::pointer_type
+    load ()
+    {
+      typename view_traits<T>::pointer_type r (res_->current ());
+      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