What's the best way to minimize the need of run time checks?

[Lawrence D’Oliveiro]

On Sunday, August 14, 2016 at 4:21:16 PM UTC+12, Chris Angelico wrote:
> You have a working class factory, which is downright *impossible* in
> many languages.

If good old, plain old C can do this:

    /*prints itself*/void main(void){int c=34;char*s="/*prints itself*/void main(void){int c=34;char*s=%c%s%c;printf(s,c,s,c);}";printf(s,c,s,c);}

it can do class factories. :)