Re: [boost] Checking for return type -- BOOST_STATIC_ASSERT?

Subject: Re: [boost] Checking for return type -- BOOST_STATIC_ASSERT?
From: Scott McMurray (me22.ca+boost_at_[hidden])
Date: 2009-08-20 18:57:43

2009/8/20 Edward Grace <ej.grace_at_[hidden]>:
>
> if O is compatible with the concept of a functor and O returns a type that
> can be converted to a float, then we are good to go -- otherwise I'd like an
> intelligible error.
>
> If, for example, O is of the type 'void (*)()' I'd like it (the compiler) to
> spit out,
> Â "The function pointer of type O must of signature float (*)()"
>

Sounds like you want something like the MPL_ASSERT example at [1]
along with the result_of metafunction[2].

[1] http://www.boost.org/doc/libs/1_39_0/libs/mpl/doc/refmanual/assert.html

[2] http://www.boost.org/doc/libs/1_39_0/libs/utility/utility.htm#result_of

HTH,
~ Scott