On Friday, 6 September 2019 at 20:16:58 UTC, Ali Çehreli wrote:
On 09/06/2019 01:02 PM, Bob4 wrote:
> I feel like it's wrong to rewrite identical functions over
and over.
Enter templates. :)
auto clamp(T)(T value, T mini, T maxi) {
if (value >= maxi) {
return maxi;
}
if (value <= mini) {
return mini;
}
return value;
}
unittest {
assert(clamp("k", "d", "y") == "k");
assert(clamp(42, 10, 20) == 20);
assert(clamp(0.5, 1.5, 1_000) == 1.5);
}
void main() {
}
You can improve the function with template constraints.
Ali
Thanks; this works, but I'm not sure why. Where does `T` come
from? I notice that I can change it to something else, like
`ABC`, but I'm not sure why I need a `(T)` prepending the
arguments.
What's the best way to type check the variables? I tried to use
prepend `assert(cast(T)value !is null);` to the beginning of the
function, but that didn't work.
I tried this, too, but it didn't work either (in fact it seemed
to ignore it entirely when I replaced `T` with this):
```
template Number(T)
if (is(T == float))
{}
```
