On Sunday, 21 September 2025 at 20:33:11 UTC, user1234 wrote:
On Saturday, 20 September 2025 at 02:36:47 UTC, Steven
Schveighoffer wrote:
What is a function type? It's the internal type that the
compiler has for a function, which you actually cannot express
in syntax.
Actually D has a syntax to expression function types:
```d
alias FT = void(int);
void v(int a){}
static assert(is(typeof(v) == function));
static assert(is(typeof(v) == FT));
```
Well, I was sure you couldn't do this! I thought the only way was
to use `typeof` on an actual function.
But I stand corrected.
Looking at historical compilers, the `alias ... =` syntax was
added in 2.087.0. But before then, you could also do it like:
```d
alias void FT(int);
```
Which gives me so much C vibes...
-Steve
