Hi to the typeof developers, I am wondering if it is possible to add some functionality so user can tell if a type is in the database of registered types during compilation. It may be there already of course. template <typename T> struct Func{ //one possible use case typedef typename boost::mpl::eval_if< boost::is_typeof_registered<T>, // true if T is registered typeof_operation<T>, // use BOOST_TYPEOF try_something_else<T> >::type type; }; Its not critical, but I thought it might be useful while libraries are adding the typeof functionality. Also might help me in the "[typeof] gcc and typeof in function return type" thread. regards Andy Little
On 2/7/06, Andy Little <andy@servocomm.freeserve.co.uk> wrote:
Hi to the typeof developers,
I am wondering if it is possible to add some functionality so user can tell if a type is in the database of registered types during compilation. It may be there already of course.
template <typename T> struct Func{ //one possible use case typedef typename boost::mpl::eval_if< boost::is_typeof_registered<T>, // true if T is registered typeof_operation<T>, // use BOOST_TYPEOF try_something_else<T> >::type type;
};
Its not critical, but I thought it might be useful while libraries are adding the typeof functionality. Also might help me in the "[typeof] gcc and typeof in function return type" thread.
regards Andy Little
This was discussed here: http://thread.gmane.org/gmane.comp.lib.boost.devel/125765 We never implemented this, as there was never any feedback that anyone would use it. Regards Peder
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"Peder Holt" wrote
This was discussed here: http://thread.gmane.org/gmane.comp.lib.boost.devel/125765
We never implemented this, as there was never any feedback that anyone would use it.
On second thoughts, If user hasnt registered type with typeof, then all you are can do is to expect they are registered with another type deduction scheme. If they have done that they can just as easily register with typeof. Therefore its best not to provide anything so everyone gets into the habit of registering with typeof. Thanks for the insight and links. regards Andy Little
"Andy Little" <andy@servocomm.freeserve.co.uk> wrote
I am wondering if it is possible to add some functionality so user can
tell
if a type is in the database of registered types during compilation. It may be there already of course.
template <typename T> struct Func{ //one possible use case typedef typename boost::mpl::eval_if< boost::is_typeof_registered<T>, // true if T is registered typeof_operation<T>, // use BOOST_TYPEOF try_something_else<T> >::type type;
};
Its not critical, but I thought it might be useful while libraries are adding the typeof functionality. Also might help me in the "[typeof] gcc and typeof in function return type" thread.
Doesn't the workaround I provided help? Regards, Arkadiy
"Arkadiy Vertleyb" wrote
"Andy Little" wrote
Its not critical, but I thought it might be useful while libraries are adding the typeof functionality. Also might help me in the "[typeof] gcc and typeof in function return type" thread.
Doesn't the workaround I provided help?
Yes. Thanks! regards Andy Little
participants (3)
-
Andy Little -
Arkadiy Vertleyb -
Peder Holt