The solution to "Error handling"...

[monkyyy]

On Friday, 3 July 2026 at 23:57:05 UTC, H. S. Teoh wrote:
> 
> What if address 0 is a VALID address to read from, and always 
> guaranteed to be zero?  Make the first page (4K or however big 
> you want it to be) of the program's address space point to a 
> read-only zero page.  The program is designed such that all 
> types are zero-initialized.  So, a pointer to address 0 is a 
> pointer to the .init value of any type.

```d
import std;

template innate(T,alias data,discrim...){
	T innate=data;
}
struct unnullablepointer(T){
	T* where;
	ref T get()=> where==null ? innate!(T,T.init) : *where;
	auto opOpAssign(string s:"&")(ref T t)=>where=&t;
	auto opAssign(T t)=>get=t;
	auto opEquals(T t)=>get==t;
}

unittest{
	unnullablepointer!int foo;
	foo=3;
	assert(foo==3);
	int bar;
	foo&=bar;
	foo=5;
	assert(bar==5);
}
```

quick, send this gist to adam 2