Re: [Boost-users] Determine at compile time whether type has subtraction semantics?

On Fri, Feb 18, 2011 at 12:55 PM, Steven Watanabe wrote:

AMDG

On 2/18/2011 9:50 AM, John Reid wrote:

...

Is it possible to determine at compile-time if a type has subtraction semantics? E.g. in struct A<T> I would like to decide at compile-time not to execute &A::subtract in the register_fns method. Then the subtract method is not instantiated and there is no error.

I believe the type traits extensions in the review queue handle this.

Just to be clear, you can only check syntax at compile-time, not semantics. -- Dave Abrahams BoostPro Computing http://www.boostpro.com