On Wednesday, 8 July 2020 at 20:11:05 UTC, IGotD- wrote:
int v;
enum sz = mySize!int // works, returns 46
enum sz2 = mySize(v) // doesn't work. Error: variable v cannot
be read at compile time
Here we have a difference between C++ and D as C++ was able
infer the size of v during compile tim
On Wednesday, 8 July 2020 at 20:11:05 UTC, IGotD- wrote:
Now since mySize is a template, shouldn't this work mySize!v,
but it doesn't? What essential understanding have I missed here?
You are trying to use a run-time value of v at compile-time,
which is not possible. If you want the modifie
On Wed, Jul 08, 2020 at 08:11:05PM +, IGotD- via Digitalmars-d-learn wrote:
[...]
> Doing the same in D, would with my lack of knowledge look like this.
>
>
> size_t mySize(T)()
> {
> return T.sizeof + 42;
> }
What you want is:
enum mySize(T) = T.sizeof + 42;
And there is no ne
I have the following functions in C++
template
inline constexpr size_t mySize(const T &v)
{
return sizeof(v) + 42;
}
template
inline constexpr size_t mySize()
{
return sizeof(T) + 42;
}
The constexpr ensures that it will be calculated to a compile
time constant otherwise the build wil
