92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
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// Boost.Geometry (aka GGL, Generic Geometry Library)
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// Copyright (c) 2007-2015 Barend Gehrels, Amsterdam, the Netherlands.
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// Copyright (c) 2008-2015 Bruno Lalande, Paris, France.
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// Copyright (c) 2009-2015 Mateusz Loskot, London, UK.
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// This file was modified by Oracle on 2015-2020.
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// Modifications copyright (c) 2015-2020, Oracle and/or its affiliates.
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// Contributed and/or modified by Menelaos Karavelas, on behalf of Oracle
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// Contributed and/or modified by Adam Wulkiewicz, on behalf of Oracle
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// Parts of Boost.Geometry are redesigned from Geodan's Geographic Library
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// (geolib/GGL), copyright (c) 1995-2010 Geodan, Amsterdam, the Netherlands.
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// Use, modification and distribution is subject to the Boost Software License,
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// Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_GEOMETRY_UTIL_TRANSFORM_VARIANT_HPP
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#define BOOST_GEOMETRY_UTIL_TRANSFORM_VARIANT_HPP
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#include <boost/config/pragma_message.hpp>
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#if !defined(BOOST_ALLOW_DEPRECATED_HEADERS)
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BOOST_PRAGMA_MESSAGE("This header is deprecated.")
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#endif
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#include <boost/mpl/transform.hpp>
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#include <boost/variant/variant_fwd.hpp>
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namespace boost { namespace geometry
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{
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/*!
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\brief Meta-function that takes a Sequence type, an MPL lambda
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expression and an optional Inserter and returns a variant type over
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the same types as the initial variant type, each transformed using
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the lambda expression.
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\ingroup utility
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\par Example
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\code
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typedef boost::mpl::vector<int, float, long> types;
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typedef transform_variant<types, add_pointer<_> > transformed;
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typedef variant<int*, float*, long*> result;
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BOOST_MPL_ASSERT(( equal<result, transformed> ));
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\endcode
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*/
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template <typename Sequence, typename Op, typename In = boost::mpl::na>
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struct transform_variant:
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make_variant_over<
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typename boost::mpl::transform<
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Sequence,
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Op,
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In
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>::type
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>
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{};
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/*!
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\brief Meta-function that takes a boost::variant type and an MPL lambda
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expression and returns a variant type over the same types as the
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initial variant type, each transformed using the lambda expression.
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\ingroup utility
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\par Example
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\code
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typedef variant<int, float, long> variant_type;
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typedef transform_variant<variant_type, add_pointer<_> > transformed;
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typedef variant<int*, float*, long*> result;
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BOOST_MPL_ASSERT(( equal<result, transformed> ));
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\endcode
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*/
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template <BOOST_VARIANT_ENUM_PARAMS(typename T), typename Op>
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struct transform_variant<variant<BOOST_VARIANT_ENUM_PARAMS(T)>, Op, boost::mpl::na> :
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make_variant_over<
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typename boost::mpl::transform<
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typename variant<BOOST_VARIANT_ENUM_PARAMS(T)>::types,
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Op
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>::type
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>
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{};
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}} // namespace boost::geometry
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#endif // BOOST_GEOMETRY_UTIL_TRANSFORM_VARIANT_HPP
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