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Don't fail environmental check if README.md exists (but .txt and no-suffix don't)

// Boost.Geometry (aka GGL, Generic Geometry Library)

// Copyright (c) 2014, Oracle and/or its affiliates.

// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle

// Licensed under the Boost Software License version 1.0.
// http://www.boost.org/users/license.html

#ifndef BOOST_GEOMETRY_ALGORITHMS_DISPATCH_IS_VALID_HPP
#define BOOST_GEOMETRY_ALGORITHMS_DISPATCH_IS_VALID_HPP

#include <boost/geometry/core/tag.hpp>

#include <boost/geometry/algorithms/not_implemented.hpp>


namespace boost { namespace geometry
{

#ifndef DOXYGEN_NO_DISPATCH
namespace dispatch
{


template
<
    typename Geometry,
    typename Tag = typename tag<Geometry>::type,
    // for multi-geometries: determines if empty multi-geometries are allowed
    bool AllowEmptyMultiGeometries = true
>
struct is_valid
    : not_implemented<Geometry>
{};


} // namespace dispatch
#endif // DOXYGEN_NO_DISPATCH


}} // namespace boost::geometry

#endif // BOOST_GEOMETRY_ALGORITHMS_DISPATCH_IS_VALID_HPP