Re: [boost] bjam question about "requires" negation

Subject: Re: [boost] bjam question about "requires" negation
From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2018-10-13 14:25:59

AMDG

On 10/13/2018 08:03 AM, James E. King III via Boost wrote:
> I want to run a test that should run without explicit operator conversion
> capability and fail to compile with explicit operation conversion
> capability, but I'm not sure how to negate the requires statement.  I'm
> sure it's trivial but I found no examples.

config.requires doesn't support this.  You'll
have to go one level lower:

[ configure.check-target-builds
  ../../../libs/config/checks//cxx_explicit_conversion_operators
  : # true-properties
    <build>no
  : # false-properties
]

>  I tried a bunch of things but
> none worked.
> 
>       [ run          implicit_conversion.cpp
>           : : : [ requires NO cxx11_explicit_conversion_operators ] :
> implicit_conversion ]
>       [ compile-fail implicit_conversion.cpp
>           :     [ requires cxx11_explicit_conversion_operators ] :
> explicit_conversion ]
> 
> How do I properly implement the "NO" part?
> 

In Christ,
Steven Watanabe