/usr/include/odb/result.hxx is in libodb-dev 2.4.0-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// copyright : Copyright (c) 2009-2015 Code Synthesis Tools CC
// license : GNU GPL v2; see accompanying LICENSE file
#ifndef ODB_RESULT_HXX
#define ODB_RESULT_HXX
#include <odb/pre.hxx>
#include <cstddef> // std::ptrdiff_t, std::size_t
#include <odb/forward.hxx> // odb::core
#include <odb/traits.hxx>
#include <odb/details/export.hxx>
#include <odb/details/shared-ptr.hxx>
namespace odb
{
class LIBODB_EXPORT result_impl: public details::shared_base
{
public:
virtual
~result_impl ();
virtual void
invalidate () = 0;
protected:
result_impl (connection&);
protected:
database& db_;
connection& conn_;
// Doubly-linked list of results.
//
// prev_ == 0 means we are the first element.
// next_ == 0 means we are the last element.
// next_ == this means we are not on the list.
//
protected:
friend class connection;
void
list_remove ();
result_impl* prev_;
result_impl* next_;
};
template <typename T, class_kind kind>
class result_base;
template <typename T, class_kind kind = class_traits<T>::kind>
class result_iterator;
// Input iterator requirements.
//
template <typename T, class_kind kind>
inline bool
operator== (result_iterator<T, kind> i, result_iterator<T, kind> j)
{
return i.equal (j);
}
template <typename T, class_kind kind>
inline bool
operator!= (result_iterator<T, kind> i, result_iterator<T, kind> j)
{
return !i.equal (j);
}
template <typename T>
class result: result_base<T, class_traits<T>::kind>
{
public:
static const class_kind kind = class_traits<T>::kind;
typedef result_base<T, kind> base;
typedef typename base::value_type value_type;
typedef value_type* pointer;
typedef const value_type* const_pointer;
typedef value_type& reference;
typedef const value_type& const_reference;
typedef result_iterator<T, kind> iterator;
typedef std::size_t size_type;
typedef std::ptrdiff_t difference_type;
typedef typename base::result_impl_type result_impl_type;
public:
result ()
{
}
explicit
result (details::shared_ptr<result_impl_type> impl)
: impl_ (impl)
{
}
// Copying or assignment of a result instance leads to one instance
// being an alias for another. Think of copying a result as copying
// a file handle -- the file you access through either of them is
// still the same.
//
public:
result (const result& r)
: impl_ (r.impl_)
{
}
result&
operator= (const result& r)
{
if (impl_ != r.impl_)
impl_ = r.impl_;
return *this;
}
// Conversion from result<T> to result<const T>.
//
template <typename UT>
result (const result<UT>& r)
//
// If you get a compiler error pointing to the line below saying
// that the impl_ member is inaccessible, then you are most likely
// trying to perform an illegal result conversion, for example,
// from result<const obj> to result<obj>.
//
: impl_ (r.impl_)
{
}
template <typename UT>
result&
operator= (const result<UT>& r)
{
// If you get a compiler error pointing to the line below saying
// that the impl_ member is inaccessible, then you are most likely
// trying to perform an illegal result conversion, for example,
// from result<const obj> to result<obj>.
//
if (impl_ != r.impl_)
impl_ = r.impl_;
return *this;
}
void
swap (result& r)
{
// @@ add swap() to shared_ptr.
//
details::shared_ptr<result_impl_type> p (impl_);
impl_ = r.impl_;
r.impl_ = p;
}
public:
iterator
begin ()
{
if (impl_)
impl_->begin ();
return iterator (impl_.get ());
}
iterator
end ()
{
return iterator ();
}
// Cache the result instead of fetching the data from the database
// one row at a time. This is necessary if you plan on performing
// database operations while iterating over the result.
//
public:
void
cache ()
{
if (impl_)
impl_->cache ();
}
public:
bool
empty () const
{
if (impl_ == 0)
return true;
impl_->begin ();
return impl_->end ();
}
// Size is only known in cached results.
//
size_type
size () const
{
return impl_ ? impl_->size () : 0;
}
// query_one() and query_value() implementation details.
//
public:
typename object_traits<T>::pointer_type
one ();
bool
one (T&);
// We cannot return by value here since result can be instantiated
// for an abstract type (polymorphic abstract base) and it seems
// the signature must be valid to the point being able to call the
// necessary constructors.
//
void
value (T&);
private:
friend class result<const T>;
details::shared_ptr<result_impl_type> impl_;
};
namespace common
{
using odb::result;
using odb::result_iterator;
}
}
#include <odb/result.txx>
#include <odb/post.hxx>
#endif // ODB_RESULT_HXX
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