Template Constraints
psychoticRabbit
meagain at meagain.com
Sat Feb 24 03:42:26 UTC 2018
On Saturday, 24 February 2018 at 03:30:45 UTC, psychoticRabbit
wrote:
> 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
>> possible
>> {
>> // 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!");
}
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