Wrap PrimitiveTransform
so that when<>
knows it is callable.
More...
#include <call.hpp>
Wrap PrimitiveTransform
so that when<>
knows it is callable.
Requires that the parameter is actually a PrimitiveTransform.
This form of call<>
is useful for annotating an arbitrary PrimitiveTransform as callable when using it with when<>
. Consider the following transform, which is parameterized with another transform.
The problem with the above is that when<>
may or may not recognize Grammar
as callable, depending on how Grammar
is implemented. (See is_callable<>
for a discussion of this issue.) You can guard against the issue by wrapping Grammar
in call<>
, such as:
The above could also have been written as: