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// Copyright (c) 2007-09 INRIA Sophia-Antipolis (France).
// All rights reserved.
//
//
// This file is part of CGAL (www.cgal.org)
//
// $URL: https://github.com/CGAL/cgal/blob/v6.1.1/STL_Extension/include/CGAL/value_type_traits.h $
// $Id: include/CGAL/value_type_traits.h 08b27d3db14 $
// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
//
// Author(s) : Alberto Ganesh Barbati and Laurent Saboret
#ifndef CGAL_VALUE_TYPE_TRAITS_H
#define CGAL_VALUE_TYPE_TRAITS_H
#include <iterator>
namespace CGAL {
/// \ingroup PkgSTLExtensionRef
/// Class providing the value type of an iterator, and
/// in the case of an output iterator, a type of objects that can be put in it.
///
template <class T>
struct value_type_traits
{
#ifndef DOXYGEN_RUNNING
typedef typename std::iterator_traits<T>::value_type type;
#else
/// If `T` is `std::insert_iterator<Container>`, `std::back_insert_iterator<Container>` or
/// `std::front_insert_iterator<Container>`, then `type` is `Container::value_type`.
/// Otherwise, `type` is `std::iterator_traits<T>::%value_type`.
typedef unspecified_type type;
#endif
};
template <class Container>
struct value_type_traits<std::back_insert_iterator<Container> >
{
typedef typename Container::value_type type;
};
template <class Container>
struct value_type_traits<std::insert_iterator<Container> >
{
typedef typename Container::value_type type;
};
template <class Container>
struct value_type_traits<std::front_insert_iterator<Container> >
{
typedef typename Container::value_type type;
};
} //namespace CGAL
#endif // CGAL_VALUE_TYPE_TRAITS_H
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