Subject: Re: [boost] [config] What Feature is this??
From: Gavin Lambert (gavinl_at_[hidden])
Date: 2017-07-25 00:40:06
On 25/07/2017 12:19, Andrey Semashev wrote:
> On Tue, Jul 25, 2017 at 2:17 AM, Gavin Lambert wrote:
>> On 25/07/2017 06:26, Edward Diener wrote:
>>> Thanks, John, I just fell asleep by not realizing you were talking about
>>> SFINAE ala enable_if etc. I am surprised that any compiler would operate
>>> differently in regard to SFINAE between using the C++03 'return-type
>>> some_function(etc.)' form and the C++11 'auto some_function(etc.) ->
>>> return-type' form, whether decltype was used or not.
>> They don't AFAIK, but you can't use the parameter types in an expression
>> until after they are actually declared as parameters, thus requiring the
>> auto -> form.
> To be more precise, you can use parameter *types* but not parameter
> *names*. Types are declared by the template<...> prefix.
I thought there was also a related issue with template type inference
that way though, but it's possible I'm misremembering.