Don wrote:
Walter Bright wrote:
Bill Baxter wrote:
version(int) is like a programming language with one variable. It's
ridiculous.
One variable, and one operator, >=.
To be fair, it was clearly intended to refer to the version of the
final user's app, not a library version or platform version or
anything else.
But to assume that only apps have versions, and that >= is the only
test you'd ever want to perform is, I agree, pretty silly.
The way to use it would be:
version (2)
{
version = HasFeatureX;
version = HasFeatureY;
version = HasFeatureZ;
}
...
version (HasFeatureY)
{
...
}
You cannot use version(int) inside libraries. You can only use it for
the app. But it's fairly common to have multiple library versions.
And the other stupid case is when an API changes in a later version.
Eg, suppose FeatureZ only exists from version 2 to 8.
You end up with:
version(2)
{
version(9)
{
}
else
{
version = HasFeatureZ;
}
}
Which can get very convoluted.
For this reason, it's usually easier to use version=Version2 than version=2.
