On Saturday, 24 February 2018 at 03:30:45 UTC, psychoticRabbit
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.
I would like to have a template constrant to enforce that a
type can be explicitly cast to another type:
void (T)(T t)
if (cast(int) T)//force `cast(int) T` to be
// Yay I know `t` can be cast to an `int`!
Is this possible?
import std.traits : isIntegral;
void testTemplate(T)(T x) if (isIntegral!T)
writeln(x, " is an integral. yeah!");
or this is probably more suitable ;-)
(should you really be using an explicity convert anyway?)
void testTemplate2(T)(T x) if (isImplicitlyConvertible!(T, int))
writeln(x, " is implicitly convertible to an int. yeah!");