On Wednesday, 27 May 2015 at 17:03:30 UTC, Artur Skawina wrote:
That already works. Eg:
alias deduceType(Args...) = typeof({
// some complex imperative code to deduce the type from
the args
import std.range;
return
mixin(iota(Args.length).map!q{`Args[`~text(a)~']'}().join("+"));
}());
struct Foo(T...) {
deduceType!(T) value;
}
static assert(is(typeof(Foo!(short, ubyte,
bool).value)==int));
What all these proposals seem to be about is:
a) better introspection (ie exposing a (preferably simplified
and std) AST)
b) AST injection
c) "better" syntax
d) better "optimizations", meaning skipping the emission of
code and data
that is never used at runtime.
artur
Maybe extending capabilities of templates would be a better
direction. They already accept aliases which are essentially
simple hygienic identifier expressions.
