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Named template parameters are completely broken in Boost 1.71 #91

@ghost

Description

Since Boost 1.71 following code fails to compile on VS 2017 - default type is chosen instead of passed one and static assert fires.

#include <boost/parameter/parameters.hpp>
#include <boost/parameter/name.hpp>

BOOST_PARAMETER_TEMPLATE_KEYWORD(type_param)
BOOST_PARAMETER_TEMPLATE_KEYWORD(another_type_param)

class A {};

class B {};

class C {};

template<class... Args>
class CheckParams {
public:
  typedef typename boost::parameter::parameters<
    boost::parameter::optional<tag::type_param>
  >::bind<Args...>::type args;
  typedef typename boost::parameter::value_type<args, tag::type_param,
    B>::type basic_shapes_policy;

  CheckParams() {
    static_assert(std::is_same<basic_shapes_policy, A>::value, "");
  }
};

void test() {
  CheckParams<
      another_type_param<C>,
      type_param<A>
    > instance;
}

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