Shopping for template languages

[cc]

On Wednesday, 7 August 2024 at 19:44:57 UTC, monkyyy wrote:
> why am I tolerating d?

I really, really like D's templating and metaprogramming.  You 
get the engine bits and wiring in under the hood, and then the 
front-facing interface is clean and expressive, with a huge 
amount of the work being done compile-time.  It's just way more 
fun to work in than anything else.

```d
@TABLE("characters")
struct Character {
	enum Class {
		NULL, FIGHTER, KNIGHT, ARCHER, MAGE, HEALER
	}
	enum Elements {
		NONE = 0,
		EARTH = 1<<0,
		AIR   = 1<<1,
		FIRE  = 1<<2,
		WATER = 1<<3,
	}
	@NULLABLE @PRIMARY int id; // auto_increment
	string name;
	@ENUMSTRING @COLUMN("class") Class cClass;
	int rarity;
	@ENUMSTRING Elements elements;
	SysTime mdate;
}

void main() {
	auto db = DBH("chars.db"); // SQLite

	auto table = db.createTable!Character;
	table.insert(Character(name: "Bob", cClass: 
Character.Class.KNIGHT, mdate: Clock.currTime));
	table.insert(Character(name: "Joe", elements: 
Character.Elements.EARTH | Character.Elements.FIRE, mdate: 
Clock.currTime));

	auto sth = db.query("SELECT * FROM characters;");
	foreach (chara; sth.as!Character) {
		writeln(chara.toStringer);
		auto u = chara.updater;
		u.mdate = Clock.currTime;
		db.update(u);
	}
}
```
```
Character(id:1, name:"Bob", cClass:KNIGHT, rarity:0, 
elements:NONE, mdate:2024-Aug-09 00:18:05.457)
Character(id:2, name:"Joe", cClass:NULL, rarity:0, 
elements:EARTH|FIRE, mdate:2024-Aug-09 00:18:05.465)
```
```
sqlite> SELECT * FROM characters;
┌────┬──────┬────────┬────────┬────────────┬───────────────┐
│ id │ name │ class  │ rarity │  elements  │     mdate     │
├────┼──────┼────────┼────────┼────────────┼───────────────┤
│ 1  │ Bob  │ KNIGHT │ 0      │ NONE       │ 1723130285473 │
│ 2  │ Joe  │ NULL   │ 0      │ EARTH,FIRE │ 1723130285482 │
└────┴──────┴────────┴────────┴────────────┴───────────────┘
```

I'm aching to improve this some more if we could get a fix to 
allow this:
```d
void foo(Nullable!int d) {}
foo(3); // compilation error
```