On Saturday, 24 February 2018 at 02:54:13 UTC, Jonathan wrote:
I am having trouble finding many useful explanations of using
template constraints beyond basic usage.
The constraint is just like static if as to what it allows
inside, so you can check almost anything in there.
Like for the cast, you might do
void name(T)(T t) if(__traits(compiles, cast(int) t) {}
just seeing it the cast compiles.
You might also do
if(is(T : int))
which asks if T is implicitly convertible to int. But since you
want explicit cast, the compiles is prolly the way to go.
is: https://dlang.org/spec/expression.html#IsExpression
compiles: https://dlang.org/spec/traits.html#compiles
