On Monday, 27 February 2017 at 19:26:06 UTC, Christian Köstlin
wrote:
Is it enough to put up static immutable modifiers?
How can I make sure, that the calculations are done at compile
time?
...
static immutable time = Unit("time", [Unit.Scale("ms", 1),
...
An initialization of a static variable (or constant, as in this
case) is indeed always done at compile time. Another option would
be using an enum storage class. Difference between enum and
static or shared immutable is that enum IS a compile time
constant, not just a runtime constant initialized at
compile-time. That means you can use enums to calculate other
compile-time stuff.
Template parameters are also calculated at compile time. If they
take a value, they are enum values, only difference to normal
enums being that their values are defined at template call site.
Thus, if you pass an expression to a template argument, you can
be sure it's calculated at compile time.
