Re: [boost] Pervasive dependency upon mpl::bool_

Subject: Re: [boost] Pervasive dependency upon mpl::bool_
From: John Maddock (boost.regex_at_[hidden])
Date: 2014-06-03 03:49:02

>> Vicente J. Botet Escriba wrote:
>>
>>> template <> struct is_pod< blank > : true_type {};
>>
>>
>> This still breaks dispatch on mpl::true_/mpl::false_. The use case is:
>>
>> void f( mpl::true_ );
>> void f( mpl::false_ );
>>
>> struct X;
>>
>> int main()
>> {
>>     f( boost::is_something<X>() );
>> }
>>
>> This is existing code, both inside and outside Boost.
>
> I use this a lot. But it is really easy to fix if it breaks. But,
> can't Boost.Core include a integral_constant and boost.mpl just use
> that for false_type and true_type too?

Right, what's wrong with:

namespace boost{ namespace mpl{

template bool<B> struct bool_;

}

namespace mpl{

using boost::core::bool_;

}}

The idea of artificially splitting up type_traits seems pretty abhorrent 
to be honest.

John.