96 lines
2.8 KiB
C++
96 lines
2.8 KiB
C++
/* ----------------------------------------------------------------------------
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* GTSAM Copyright 2010, Georgia Tech Research Corporation,
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* Atlanta, Georgia 30332-0415
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* All Rights Reserved
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* Authors: Frank Dellaert, et al. (see THANKS for the full author list)
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* See LICENSE for the license information
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* -------------------------------------------------------------------------- */
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/**
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* @file boost_variant_with_workaround.h
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* @brief Includes boost/variant.hpp with a workaround for a variant/boost graph conflict, by defining the variant 'get' function in a new variant_workaround namespace.
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* @author Richard Roberts
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*/
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#pragma once
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#include <boost/variant.hpp>
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#include <boost/version.hpp>
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namespace variant_workaround {
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/* ************************************************************************* */
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// The following functions are pasted from boost/variant/get.hpp, but with
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// explicit argument types to avoid a conflict with 'get' in the boost graph
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// library that exists in boost < 1.47.
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#if BOOST_VERSION >= 104700
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using boost::get;
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#else
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template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
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inline
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typename boost::add_pointer<U>::type
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get(
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boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
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BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
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)
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{
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typedef typename boost::add_pointer<U>::type U_ptr;
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if (!operand) return static_cast<U_ptr>(0);
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boost::detail::variant::get_visitor<U> v;
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return operand->apply_visitor(v);
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}
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template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
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inline
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typename boost::add_pointer<const U>::type
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get(
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const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >* operand
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BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
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)
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{
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typedef typename boost::add_pointer<const U>::type U_ptr;
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if (!operand) return static_cast<U_ptr>(0);
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boost::detail::variant::get_visitor<const U> v;
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return operand->apply_visitor(v);
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}
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template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
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inline
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typename boost::add_reference<U>::type
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get(
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boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
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BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
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)
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{
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typedef typename boost::add_pointer<U>::type U_ptr;
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U_ptr result = variant_workaround::get<U>(&operand);
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if (!result)
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throw boost::bad_get();
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return *result;
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}
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template <typename U, BOOST_VARIANT_ENUM_PARAMS(typename T) >
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inline
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typename boost::add_reference<const U>::type
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get(
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const boost::variant< BOOST_VARIANT_ENUM_PARAMS(T) >& operand
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BOOST_VARIANT_AUX_GET_EXPLICIT_TEMPLATE_TYPE(U)
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)
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{
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typedef typename boost::add_pointer<const U>::type U_ptr;
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U_ptr result = variant_workaround::get<const U>(&operand);
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if (!result)
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throw boost::bad_get();
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return *result;
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}
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#endif
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}
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