Re: [boost] boost::system::error_code::operator unspecified-bool-type()

Subject: Re: [boost] boost::system::error_code::operator unspecified-bool-type()
From: Stewart, Robert (Robert.Stewart_at_[hidden])
Date: 2011-03-11 10:05:16

Gruenke, Matt wrote:
>
> problem I've encountered is that error_code's operator for
> boolean tests assumes that an error value of 0 == success.
> I've found it puzzling that this logic doesn't reside in the
> error_category, where it can be customized as needed.
[snip]
>       class error_category : public noncopyable
>       {
>       public:
>         virtual bool is_error( int ev ) const
>         {
>           return ev != 0;
>         }
>       };
>
>       class error_code
>       {
>       public:
>         operator unspecified-bool-type() const
>         {
>           return m_cat->is_error( m_val ) ? unspecified_bool_true : 0;
>         }
>       };

That looks like an excellent addition that would increase the applicability.

_____
Rob Stewart                           robert.stewart_at_[hidden]
Software Engineer, Core Software      using std::disclaimer;
Susquehanna International Group, LLP  http://www.sig.com

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