63e88f80
 Hu Chunming
提交三方库
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//
// Copyright 2005-2007 Adobe Systems Incorporated
//
// Distributed under the Boost Software License, Version 1.0
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt
//
#ifndef BOOST_GIL_CONCEPTS_POINT_HPP
#define BOOST_GIL_CONCEPTS_POINT_HPP
#include <boost/gil/concepts/basic.hpp>
#include <boost/gil/concepts/concept_check.hpp>
#include <cstddef>
#if defined(BOOST_CLANG)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wunknown-pragmas"
#pragma clang diagnostic ignored "-Wunused-local-typedefs"
#endif
#if defined(BOOST_GCC) && (BOOST_GCC >= 40900)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wunused-local-typedefs"
#endif
namespace boost { namespace gil {
// Forward declarations
template <typename T>
class point;
template <std::size_t K, typename T>
T const& axis_value(point<T> const& p);
template <std::size_t K, typename T>
T& axis_value(point<T>& p);
/// \brief N-dimensional point concept
/// \code
/// concept PointNDConcept<typename T> : Regular<T>
/// {
/// // the type of a coordinate along each axis
/// template <size_t K>
/// struct axis; where Metafunction<axis>;
///
/// const size_t num_dimensions;
///
/// // accessor/modifier of the value of each axis.
///
/// template <size_t K>
/// typename axis<K>::type const& T::axis_value() const;
///
/// template <size_t K>
/// typename axis<K>::type& T::axis_value();
/// };
/// \endcode
/// \ingroup PointConcept
///
template <typename P>
struct PointNDConcept
{
void constraints()
{
gil_function_requires<Regular<P>>();
using value_type = typename P::value_type;
ignore_unused_variable_warning(value_type{});
static const std::size_t N = P::num_dimensions;
ignore_unused_variable_warning(N);
using FT = typename P::template axis<0>::coord_t;
using LT = typename P::template axis<N - 1>::coord_t;
FT ft = gil::axis_value<0>(point);
axis_value<0>(point) = ft;
LT lt = axis_value<N - 1>(point);
axis_value<N - 1>(point) = lt;
//value_type v=point[0];
//ignore_unused_variable_warning(v);
}
P point;
};
/// \brief 2-dimensional point concept
/// \code
/// concept Point2DConcept<typename T> : PointNDConcept<T>
/// {
/// where num_dimensions == 2;
/// where SameType<axis<0>::type, axis<1>::type>;
///
/// typename value_type = axis<0>::type;
///
/// value_type const& operator[](T const&, size_t i);
/// value_type& operator[](T&, size_t i);
///
/// value_type x,y;
/// };
/// \endcode
/// \ingroup PointConcept
///
template <typename P>
struct Point2DConcept
{
void constraints()
{
gil_function_requires<PointNDConcept<P>>();
static_assert(P::num_dimensions == 2, "");
point.x = point.y;
point[0] = point[1];
}
P point;
};
}} // namespace boost::gil
#if defined(BOOST_CLANG)
#pragma clang diagnostic pop
#endif
#if defined(BOOST_GCC) && (BOOST_GCC >= 40900)
#pragma GCC diagnostic pop
#endif
#endif
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