[LLVMbugs] [Bug 18180] New: Compilation error with boost::optional (from Boost 1.55)

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18180

            Bug ID: 18180
           Summary: Compilation error with boost::optional (from Boost
                    1.55)
           Product: clang
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: -New Bugs
          Assignee: unassignedclangbugs at nondot.org
          Reporter: benpope81 at gmail.com
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 11690
  --> http://llvm.org/bugs/attachment.cgi?id=11690&action=edit
Preprocessed source

Unfortunately I haven't managed to reduce the preprocessed output, but the gist
of it is this:

#include <boost/optional.hpp>

int main()
{
   boost::optional<int> max;
   return max == false;
}

clang++-3.4 -std=c++11 -stdlib=libc++ -I../boost/test/build/boost -lc++abi
signal_test.cpp

signal_test.cpp:6:15: error: invalid operands to binary expression
('boost::optional<int>' and 'int')
   return max == false;
          ~~~ ^  ~~~~~
../boost/test/build/boost/boost/optional/optional.hpp:838:6: note: candidate
function [with T = int] not viable: no known conversion from 'bool' to 'none_t'
(aka 'int boost::detail::none_helper::*') for 2nd
      argument
bool operator == ( optional<T> const& x, none_t )
     ^
../boost/test/build/boost/boost/optional/optional.hpp:769:6: note: candidate
template ignored: deduced conflicting types for parameter 'T' ('int' vs.
'bool')
bool operator == ( optional<T> const& x, T const& y )
     ^
../boost/test/build/boost/boost/optional/optional.hpp:735:6: note: candidate
template ignored: could not match 'optional<type-parameter-0-0>' against 'bool'
bool operator == ( optional<T> const& x, optional<T> const& y )
     ^
../boost/test/build/boost/boost/optional/optional.hpp:803:6: note: candidate
template ignored: could not match 'optional<type-parameter-0-0>' against 'bool'
bool operator == ( T const& x, optional<T> const& y )
     ^
../boost/test/build/boost/boost/optional/optional.hpp:872:6: note: candidate
template ignored: could not match 'optional<type-parameter-0-0>' against 'bool'
bool operator == ( none_t , optional<T> const& y )

This code compiles with Clang 3.3 and G++-4.8.2, but I haven't verified whether
it's correct.  Preprocessed source attached.

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