Safer binary reading (or writing) code

[cc]

On Tuesday, 12 December 2023 at 09:43:39 UTC, Joel wrote:
> I've got this mixin thing, I think it's less typo-prone. I 
> haven't been able to make it show the variable's name, though. 
> Also, it should be optional whether it prints anything, (it's 
> not hard for me to do that though).
>
> ```d
> // mixin(jread("width")); -> fread(&width, 1, width.sizeof, 
> bfile);
> auto jread(string var) => `fread(&`~var~`, 1, `~var~`.sizeof, 
> bfile); writeln("read var=", `~var~`);`;
> ```

When I need to insert a variable name numerous times into a bit 
of mixin code, I often use a replace pattern like this:
```d
mixin(q{
	static struct _aa_$FIELD {
		KeyType!(typeof(field)) key;
		ValueType!(typeof(field)) val;
	}
	Array!(_aa_$FIELD) $FIELD;
}.replace("$FIELD", myVariableName));
```