On Saturday, 17 October 2015 at 07:48:39 UTC, Nordlöw wrote:
Does DMD cache template instantiations?
Yes, and it's required by the spec:
"Multiple instantiations of a TemplateDeclaration with the same
TemplateArgumentList all will refer to the same instantiation."
http://dlang.org/template.html
That is, is it preferred to do, for instance, either
static if (isIntegral!T && isUnsigned!(T)) {}
else static if (isIntegral!T && isSigned!(T)) {}
or
enum integral = isIntegral!T;
static if (integral && isUnsigned!(T)) {}
else static if (integral && isSigned!(T)) {}
It *might* make a little difference if you have thousands of
instantiations, because for each instantiation the compiler needs
to check whether it has already instantiated the templation with
that combination of arguments, but I wouldn't worry about it.
