regression in boost recursive variant

[mike.gresens@…]

Hi,

see added sample code (std=c++14).

build with boost1.61: fine

build with boost1.62: broken

gcc (Ubuntu 5.4.0-6ubuntu1~16.04.2) 5.4.0 20160609

Most important compiler errors (i think):

source/test.cpp:104:46:   required from here
/usr/include/c++/5/bits/hashtable_policy.h:85:34: error: no match for call to ‘(const hessian::hash) (const boost::recursive_variant_&)’
  noexcept(declval<const _Hash&>()(declval<const _Key&>()))>
                                  ^
source/test.cpp:59:9: note: candidate: size_t hessian::hash::operator()(const value_t&) const
  size_t operator()(const value_t& value) const noexcept;
         ^
source/test.cpp:59:9: note:   no known conversion for argument 1 from ‘const boost::recursive_variant_’ to ‘const value_t& {aka const boost::variant<boost::detail::variant::recursive_flag<boost::blank>, bool, int, long int, double, boost::posix_time::ptime, std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, std::__cxx11::basic_string<unsigned char, std::char_traits<unsigned char>, std::allocator<unsigned char> >, std::vector<boost::recursive_variant_, std::allocator<boost::recursive_variant_> >, std::unordered_map<boost::recursive_variant_, boost::recursive_variant_, hessian::hash, std::equal_to<boost::recursive_variant_>, std::allocator<std::pair<const boost::recursive_variant_, boost::recursive_variant_> > >, std::unordered_map<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::recursive_variant_, std::hash<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::equal_to<std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> > >, std::allocator<std::pair<const std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, boost::recursive_variant_> > > >&}’

[mike.gresens@…]

sample code

[mike.gresens@…]

compiler errors

[Antony Polukhin]

Fixed by Mikhail Maximov in ​e0b65c01. Fix will appear in Boost 1.64