Re: [boost] SFINAE yes_type and no_type

Subject: Re: [boost] SFINAE yes_type and no_type
From: Mathias Gaunard (mathias.gaunard_at_[hidden])
Date: 2011-04-16 06:23:00

On 16/04/2011 12:11, Robert Jones wrote:
> On Fri, Apr 15, 2011 at 4:13 PM, Jeroen Habraken<vexocide_at_[hidden]>  wrote:
>
>> Hi,
>>
>> Is there a specific yes_type and no_type inside boost that I should be
>> using when writing a SFINAE test? There seem to be quite a few defined
>> already and reinventing the wheel (albeit it being trivial) again
>> doesn't make sense.
>>
>>
> There's true and false types, would that do? Yes/no is generally less clear
> than
> true/false as the phrasing of the resulting function identifier tends to be
> less crisp.
>
> if ( doesItWork( )== yes )....
>
> vs
>
> if ( itWorks( ) )....

They need to be differently sized types so that you can use sizeof to 
distinguish which function overloads gets picked up.