[boost] Re: typeof

From: David Abrahams (dave_at_[hidden])
Date: 2004-05-03 08:55:57

"Arkadiy Vertleyb" <vertleyb_at_[hidden]> writes:

> The provided example shows what registration needs to be done to calculate
> the type of a lambda functor:
>
> #include BOOST_TYPEOF_BEGIN_REGISTRATION()

Where would that line go, in a header file?

> BOOST_TYPEOF_REGISTER_TEMPLATE(tuples::tuple, 2);
> BOOST_TYPEOF_REGISTER_TEMPLATE(lambda_functor, 1);
> BOOST_TYPEOF_REGISTER_TEMPLATE(lambda_functor_base, 2);
> BOOST_TYPEOF_REGISTER_TEMPLATE(relational_action, 1);
> BOOST_TYPEOF_REGISTER_TEMPLATE(logical_action, 1);
> BOOST_TYPEOF_REGISTER_TYPE(greater_action);
> BOOST_TYPEOF_REGISTER_TYPE(less_action);
> BOOST_TYPEOF_REGISTER_TYPE(and_action);
> BOOST_TYPEOF_REGISTER_TYPE(placeholder<1>);
> BOOST_TYPEOF_REGISTER_TYPE(placeholder<2>);
>
> #include BOOST_TYPEOF_END_REGISTRATION()

Where would that line go, in a source file?  If so, that sounds
error-prone to me.

FYI, to take advantage of GCC's buggy __typeof__, you may have to
accept some limitations on its type argument.  I think it has problems
with references or something.

-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com