Re: [boost] [core] Breaking bugfix in scoped enums

Subject: Re: [boost] [core] Breaking bugfix in scoped enums
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2014-06-06 19:12:32

On Saturday 07 June 2014 01:04:28 Vicente J. Botet Escriba wrote:
> Le 07/06/14 00:41, Andrey Semashev a écrit :
> > resulted in the enums being convertible to int. This is a potentially
> > breaking> 
> > change, the code like this will now not compile:
> >   BOOST_SCOPED_ENUM_DECLARE_BEGIN(color)
> >   {
> >   
> >     red, green, blue
> >   
> >   }
> >   BOOST_SCOPED_ENUM_DECLARE_END(color)
> >   
> >   void foo(boost::native_type<color>::type col);
> >   
> >   color col = color::blue;
> >   foo(col);
> > 
> > The call to foo() should be done like this:
> >   foo(boost::native_value(col));
> > 
> > Previously, the conversion was implicit.
> 
> Yes, this is a breaking change. The implicit conversion from EnumType to
> enum_type was intentional.
> 
> operator enum_type() const BOOST_NOEXCEPT { return get_native_value_(); }
> 
> I was expecting two implicit conversions: one from EnumType to enum_type
> and the other from enum_type to int. Am I missing something in C++98?

I'll have to check later, but scoped_enum_compile_fail_conv_to_int.cpp test 
fails with clang 3.4 in C++03 mode with this operator.