exception ambiguous node while parsing boost::variant header

[PeterSommerlad]

Expected Behavior

parsing succeeds...

//-----------------------------------------------------------------------------
// boost variant/detail/apply_visitor_binary.hpp header file
// See http://www.boost.org for updates, documentation, and revision history.
//-----------------------------------------------------------------------------
//
// Copyright (c) 2002-2003 Eric Friedman
// Copyright (c) 2014-2019 Antony Polukhin
//
// 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_VARIANT_DETAIL_APPLY_VISITOR_BINARY_HPP
#define BOOST_VARIANT_DETAIL_APPLY_VISITOR_BINARY_HPP

#include <boost/config.hpp>

#include <boost/variant/detail/apply_visitor_unary.hpp>

#if !defined(BOOST_NO_CXX14_DECLTYPE_AUTO) && !defined(BOOST_NO_CXX11_DECLTYPE_N3276)
#   include <boost/variant/detail/has_result_type.hpp>
#endif

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
#   include <boost/core/enable_if.hpp>
#   include <boost/type_traits/is_lvalue_reference.hpp>
#   include <boost/type_traits/is_same.hpp>
#   include <boost/move/move.hpp>
#   include <boost/move/utility.hpp>
#endif

namespace boost {

//////////////////////////////////////////////////////////////////////////
// function template apply_visitor(visitor, visitable1, visitable2)
//
// Visits visitable1 and visitable2 such that their values (which we
// shall call x and y, respectively) are used as arguments in the
// expression visitor(x, y).
//

namespace detail { namespace variant {

template <typename Visitor, typename Value1, bool MoveSemantics>
class apply_visitor_binary_invoke
{
public: // visitor typedefs

    typedef typename Visitor::result_type
        result_type;

private: // representation

    Visitor& visitor_;
    Value1& value1_;

public: // structors

    apply_visitor_binary_invoke(Visitor& visitor, Value1& value1) BOOST_NOEXCEPT
        : visitor_(visitor)
        , value1_(value1)
    {
    }

public: // visitor interfaces

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES

    template <typename Value2>
        typename enable_if_c<MoveSemantics && is_same<Value2, Value2>::value, result_type>::type
    operator()(Value2&& value2)
    {
        return visitor_(::boost::move(value1_), ::boost::forward<Value2>(value2));
    }

    template <typename Value2>
        typename disable_if_c<MoveSemantics && is_same<Value2, Value2>::value, result_type>::type
    operator()(Value2&& value2)
    {
        return visitor_(value1_, ::boost::forward<Value2>(value2));
    }

#else

    template <typename Value2>
        result_type
    operator()(Value2& value2)
    {
        return visitor_(value1_, value2);
    }

#endif

private:
    apply_visitor_binary_invoke& operator=(const apply_visitor_binary_invoke&);
};

template <typename Visitor, typename Visitable2, bool MoveSemantics>
class apply_visitor_binary_unwrap
{
public: // visitor typedefs

    typedef typename Visitor::result_type
        result_type;

private: // representation

    Visitor& visitor_;
    Visitable2& visitable2_;

public: // structors

    apply_visitor_binary_unwrap(Visitor& visitor, Visitable2& visitable2) BOOST_NOEXCEPT
        : visitor_(visitor)
        , visitable2_(visitable2)
    {
    }

public: // visitor interfaces

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES

    template <typename Value1>
        typename enable_if_c<MoveSemantics && is_same<Value1, Value1>::value, result_type>::type
    operator()(Value1&& value1)
    {
        apply_visitor_binary_invoke<
              Visitor
            , Value1
            , ! ::boost::is_lvalue_reference<Value1>::value
            > invoker(visitor_, value1);

        return boost::apply_visitor(invoker, ::boost::move(visitable2_));
    }

    template <typename Value1>
        typename disable_if_c<MoveSemantics && is_same<Value1, Value1>::value, result_type>::type
    operator()(Value1&& value1)
    {
        apply_visitor_binary_invoke<
              Visitor
            , Value1
            , ! ::boost::is_lvalue_reference<Value1>::value
            > invoker(visitor_, value1);

        return boost::apply_visitor(invoker, visitable2_);
    }

#else

    template <typename Value1>
        result_type
    operator()(Value1& value1)
    {
        apply_visitor_binary_invoke<
              Visitor
            , Value1
            , false
            > invoker(visitor_, value1);

        return boost::apply_visitor(invoker, visitable2_);
    }

#endif

private:
    apply_visitor_binary_unwrap& operator=(const apply_visitor_binary_unwrap&);

};

}} // namespace detail::variant

//
// nonconst-visitor version:
//

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES

template <typename Visitor, typename Visitable1, typename Visitable2>
inline typename Visitor::result_type
apply_visitor( Visitor& visitor, Visitable1&& visitable1, Visitable2&& visitable2)
{
    ::boost::detail::variant::apply_visitor_binary_unwrap<
          Visitor, Visitable2, ! ::boost::is_lvalue_reference<Visitable2>::value
        > unwrapper(visitor, visitable2);

    return boost::apply_visitor(unwrapper, ::boost::forward<Visitable1>(visitable1));
}

#else

template <typename Visitor, typename Visitable1, typename Visitable2>
inline typename Visitor::result_type
apply_visitor( Visitor& visitor, Visitable1& visitable1, Visitable2& visitable2)
{
    ::boost::detail::variant::apply_visitor_binary_unwrap<
          Visitor, Visitable2, false
        > unwrapper(visitor, visitable2);

    return boost::apply_visitor(unwrapper, visitable1);
}

#endif

//
// const-visitor version:
//

#ifndef BOOST_NO_CXX11_RVALUE_REFERENCES

template <typename Visitor, typename Visitable1, typename Visitable2>
inline typename Visitor::result_type
apply_visitor( const Visitor& visitor , Visitable1&& visitable1 , Visitable2&& visitable2)
{
    ::boost::detail::variant::apply_visitor_binary_unwrap<
          const Visitor, Visitable2, ! ::boost::is_lvalue_reference<Visitable2>::value
        > unwrapper(visitor, visitable2);

    return boost::apply_visitor(unwrapper, ::boost::forward<Visitable1>(visitable1));
}

#else

template <typename Visitor, typename Visitable1, typename Visitable2>
inline typename Visitor::result_type
apply_visitor( const Visitor& visitor , Visitable1& visitable1 , Visitable2& visitable2)
{
    ::boost::detail::variant::apply_visitor_binary_unwrap<
          const Visitor, Visitable2, false
        > unwrapper(visitor, visitable2);

    return boost::apply_visitor(unwrapper, visitable1);
}

#endif


#if !defined(BOOST_NO_CXX14_DECLTYPE_AUTO) && !defined(BOOST_NO_CXX11_DECLTYPE_N3276)

//////////////////////////////////////////////////////////////////////////
// function template apply_visitor(visitor, visitable1, visitable2)
//
// C++14 part.
//

namespace detail { namespace variant {

template <typename Visitor, typename Value1, bool MoveSemantics>
class apply_visitor_binary_invoke_cpp14
{
    Visitor& visitor_;
    Value1& value1_;

public: // structors

    apply_visitor_binary_invoke_cpp14(Visitor& visitor, Value1& value1) BOOST_NOEXCEPT
        : visitor_(visitor)
        , value1_(value1)
    {
    }

public: // visitor interfaces

    template <typename Value2>
    decltype(auto) operator()(Value2&& value2, typename enable_if_c<MoveSemantics && is_same<Value2, Value2>::value>::type* = 0)
    {
        return visitor_(::boost::move(value1_), ::boost::forward<Value2>(value2));
    }

    template <typename Value2>
    decltype(auto) operator()(Value2&& value2, typename disable_if_c<MoveSemantics && is_same<Value2, Value2>::value>::type* = 0)
    {
        return visitor_(value1_, ::boost::forward<Value2>(value2));
    }

private:
    apply_visitor_binary_invoke_cpp14& operator=(const apply_visitor_binary_invoke_cpp14&);
};

template <typename Visitor, typename Visitable2, bool MoveSemantics>
class apply_visitor_binary_unwrap_cpp14
{
    Visitor& visitor_;
    Visitable2& visitable2_;

public: // structors

    apply_visitor_binary_unwrap_cpp14(Visitor& visitor, Visitable2& visitable2) BOOST_NOEXCEPT
        : visitor_(visitor)
        , visitable2_(visitable2)
    {
    }

public: // visitor interfaces

    template <typename Value1>
    decltype(auto) operator()(Value1&& value1, typename enable_if_c<MoveSemantics && is_same<Value1, Value1>::value>::type* = 0)
    {
        apply_visitor_binary_invoke_cpp14<
              Visitor
            , Value1
            , ! ::boost::is_lvalue_reference<Value1>::value
            > invoker(visitor_, value1);

        return boost::apply_visitor(invoker, ::boost::move(visitable2_));
    }

    template <typename Value1>
    decltype(auto) operator()(Value1&& value1, typename disable_if_c<MoveSemantics && is_same<Value1, Value1>::value>::type* = 0)
    {
        apply_visitor_binary_invoke_cpp14<
              Visitor
            , Value1
            , ! ::boost::is_lvalue_reference<Value1>::value
            > invoker(visitor_, value1);

        return boost::apply_visitor(invoker, visitable2_);
    }

private:
    apply_visitor_binary_unwrap_cpp14& operator=(const apply_visitor_binary_unwrap_cpp14&);
};

}} // namespace detail::variant

template <typename Visitor, typename Visitable1, typename Visitable2>
inline decltype(auto) apply_visitor(Visitor& visitor, Visitable1&& visitable1, Visitable2&& visitable2,
    typename boost::disable_if<
        boost::detail::variant::has_result_type<Visitor>
    >::type* = 0)
{
    ::boost::detail::variant::apply_visitor_binary_unwrap_cpp14<
          Visitor, Visitable2, ! ::boost::is_lvalue_reference<Visitable2>::value
        > unwrapper(visitor, visitable2);

    return boost::apply_visitor(unwrapper, ::boost::forward<Visitable1>(visitable1));
}

template <typename Visitor, typename Visitable1, typename Visitable2>
inline decltype(auto) apply_visitor(const Visitor& visitor, Visitable1&& visitable1, Visitable2&& visitable2,
    typename boost::disable_if<
        boost::detail::variant::has_result_type<Visitor>
    >::type* = 0)
{
    ::boost::detail::variant::apply_visitor_binary_unwrap_cpp14<
          const Visitor, Visitable2, ! ::boost::is_lvalue_reference<Visitable2>::value
        > unwrapper(visitor, visitable2);

    return boost::apply_visitor(unwrapper, ::boost::forward<Visitable1>(visitable1));
}


#endif // !defined(BOOST_NO_CXX14_DECLTYPE_AUTO) && !defined(BOOST_NO_CXX11_DECLTYPE_N3276)

} // namespace boost

#endif // BOOST_VARIANT_DETAIL_APPLY_VISITOR_BINARY_HPP

Actual Behavior

eclipse.buildId=unknown
java.version=9.0.4
java.vendor=Oracle Corporation
BootLoader constants: OS=macosx, ARCH=x86_64, WS=cocoa, NL=en_CH
Framework arguments:  -keyring /Users/sop/.eclipse_keyring
Command-line arguments:  -os macosx -ws cocoa -arch x86_64 -keyring /Users/sop/.eclipse_keyring

org.eclipse.cdt.core
Error
Thu Jul 11 10:21:35 CEST 2019
Error: Encountered an ambiguous node "::boost::forward<Visitable1>(visitable1)" at /usr/local/include/boost/variant/detail/apply_visitor_binary.hpp, line 349 while parsing /usr/local/include/boost/variant/detail/apply_visitor_binary.hpp

org.eclipse.cdt.internal.core.parser.ParserException: Encountered an ambiguous node "::boost::forward<Visitable1>(visitable1)" at /usr/local/include/boost/variant/detail/apply_visitor_binary.hpp, line 349 while parsing /usr/local/include/boost/variant/detail/apply_visitor_binary.hpp
	at org.eclipse.cdt.internal.core.dom.parser.ASTAmbiguousNode.logAmbiguousNodeError(ASTAmbiguousNode.java:191)
	at org.eclipse.cdt.internal.core.dom.parser.ASTAmbiguousNode.getEvaluation(ASTAmbiguousNode.java:181)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTFunctionCallExpression.checkForExplicitTypeConversion(CPPASTFunctionCallExpression.java:329)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTFunctionCallExpression.computeEvaluation(CPPASTFunctionCallExpression.java:304)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTFunctionCallExpression.getEvaluation(CPPASTFunctionCallExpression.java:295)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor$ReturnTypeDeducer.onReturnStatement(CPPVisitor.java:2416)
	at org.eclipse.cdt.core.dom.ast.util.ReturnStatementVisitor.visit(ReturnStatementVisitor.java:73)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTReturnStatement.accept(CPPASTReturnStatement.java:79)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTCompoundStatement.accept(CPPASTCompoundStatement.java:103)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.deduceReturnType(CPPVisitor.java:2469)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.createAutoFunctionType(CPPVisitor.java:2536)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.createAutoType(CPPVisitor.java:2250)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.createType(CPPVisitor.java:2141)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.createType(CPPVisitor.java:2109)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics.resolveFunctionDeclaration(CPPSemantics.java:2890)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics.resolveFunction(CPPSemantics.java:2667)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics.resolveAmbiguities(CPPSemantics.java:2381)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics.resolveAmbiguities(CPPSemantics.java:2032)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPScope.getBinding(CPPScope.java:132)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPScope.getBinding(CPPScope.java:401)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.createBinding(CPPVisitor.java:855)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.createBinding(CPPVisitor.java:326)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTName.createIntermediateBinding(CPPASTName.java:67)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTNameBase.resolveBinding(CPPASTNameBase.java:111)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPDependentEvaluation$DeferredResolutionBinding.resolve(CPPDependentEvaluation.java:180)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPDependentEvaluation.getTemplateDefinition(CPPDependentEvaluation.java:52)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPDependentEvaluation.getTemplateDefinitionScope(CPPDependentEvaluation.java:59)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalBinary.computeOverload(EvalBinary.java:337)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalBinary.getOverload(EvalBinary.java:318)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.EvalBinary.getValue(EvalBinary.java:182)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPTemplateNonTypeArgument.<init>(CPPTemplateNonTypeArgument.java:40)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPTemplates.createTemplateArgumentArray(CPPTemplates.java:2306)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPTemplates.createBinding(CPPTemplates.java:805)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTTemplateId.createIntermediateBinding(CPPASTTemplateId.java:126)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTNameBase.resolvePreBinding(CPPASTNameBase.java:98)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.getContainingScopeOrNull(CPPVisitor.java:1300)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.getContainingScope(CPPVisitor.java:1259)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics.getLookupScope(CPPSemantics.java:952)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics.lookup(CPPSemantics.java:1064)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPSemantics.resolveBinding(CPPSemantics.java:356)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.semantics.CPPVisitor.createBinding(CPPVisitor.java:297)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTName.createIntermediateBinding(CPPASTName.java:67)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTNameBase.resolvePreBinding(CPPASTNameBase.java:98)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTQualifiedName.resolvePreBinding(CPPASTQualifiedName.java:105)
	at org.eclipse.cdt.internal.core.dom.parser.ASTAmbiguousNode.doResolveAmbiguity(ASTAmbiguousNode.java:130)
	at org.eclipse.cdt.internal.core.dom.parser.ASTAmbiguousNode.resolveAmbiguity(ASTAmbiguousNode.java:87)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTAmbiguityResolver.visit(CPPASTAmbiguityResolver.java:87)
	at org.eclipse.cdt.internal.core.dom.parser.ASTAmbiguousNode.accept(ASTAmbiguousNode.java:70)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTCompoundStatement.accept(CPPASTCompoundStatement.java:103)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTFunctionDefinition.accept(CPPASTFunctionDefinition.java:225)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTAmbiguityResolver.visit(CPPASTAmbiguityResolver.java:181)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTFunctionDefinition.accept(CPPASTFunctionDefinition.java:191)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTTemplateDeclaration.accept(CPPASTTemplateDeclaration.java:131)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTNamespaceDefinition.accept(CPPASTNamespaceDefinition.java:144)
	at org.eclipse.cdt.internal.core.dom.parser.ASTTranslationUnit.accept(ASTTranslationUnit.java:289)
	at org.eclipse.cdt.internal.core.dom.parser.cpp.CPPASTTranslationUnit.resolveAmbiguities(CPPASTTranslationUnit.java:245)
	at org.eclipse.cdt.internal.core.dom.parser.AbstractGNUSourceCodeParser.resolveAmbiguities(AbstractGNUSourceCodeParser.java:705)
	at org.eclipse.cdt.internal.core.dom.parser.AbstractGNUSourceCodeParser.parse(AbstractGNUSourceCodeParser.java:688)
	at org.eclipse.cdt.core.dom.parser.AbstractCLikeLanguage.getASTTranslationUnit(AbstractCLikeLanguage.java:171)
	at org.eclipse.cdt.internal.core.model.TranslationUnit.getAST(TranslationUnit.java:886)
	at org.eclipse.cdt.internal.core.model.CModelBuilder2.parse(CModelBuilder2.java:152)
	at org.eclipse.cdt.internal.core.model.TranslationUnit.parseUsingCModelBuilder(TranslationUnit.java:683)
	at org.eclipse.cdt.internal.core.model.TranslationUnit.parse(TranslationUnit.java:670)
	at org.eclipse.cdt.internal.core.model.TranslationUnit.buildStructure(TranslationUnit.java:469)
	at org.eclipse.cdt.internal.core.model.Openable.generateInfos(Openable.java:264)
	at org.eclipse.cdt.internal.core.model.CElement.openWhenClosed(CElement.java:429)
	at org.eclipse.cdt.internal.core.model.TranslationUnit.makeConsistent(TranslationUnit.java:573)
	at org.eclipse.cdt.internal.core.model.ReconcileWorkingCopyOperation.executeOperation(ReconcileWorkingCopyOperation.java:65)
	at org.eclipse.cdt.internal.core.model.CModelOperation.execute(CModelOperation.java:346)
	at org.eclipse.cdt.internal.core.model.CModelOperation.run(CModelOperation.java:613)
	at org.eclipse.cdt.internal.core.model.CModelOperation.runOperation(CModelOperation.java:641)
	at org.eclipse.cdt.internal.core.model.WorkingCopy.reconcile(WorkingCopy.java:365)
	at org.eclipse.cdt.internal.ui.text.CReconcilingStrategy.reconcile(CReconcilingStrategy.java:79)
	at org.eclipse.cdt.internal.ui.text.CReconcilingStrategy.reconcile(CReconcilingStrategy.java:64)
	at org.eclipse.cdt.internal.ui.text.CompositeReconcilingStrategy.reconcile(CompositeReconcilingStrategy.java:89)
	at org.eclipse.cdt.internal.ui.text.CCompositeReconcilingStrategy.reconcile(CCompositeReconcilingStrategy.java:95)
	at org.eclipse.jface.text.reconciler.MonoReconciler.process(MonoReconciler.java:76)
	at org.eclipse.cdt.internal.ui.text.CReconciler.process(CReconciler.java:351)
	at org.eclipse.jface.text.reconciler.AbstractReconciler$BackgroundThread.run(AbstractReconciler.java:210)

Cevelop Version, Operating System and Compiler

Cevelop C++ IDE

Version: 1.12.1-201907081203

macos mojave.