Re: Expressing range constraints in CNF form

[Andrei Alexandrescu via Digitalmars-d]

On 6/11/17 3:45 PM, Walter Bright wrote:

On 6/10/2017 5:28 PM, Andrei Alexandrescu wrote:

     && is(typeof(lvalueOf!R.popFront)) && msg("must support back");

Wouldn't it work better as:

     && (is(typeof(lvalueOf!R.popFront)) || msg("must support back"));

     bool msg(string) { return false; }

? Then msg() is only called if the first clause fails.

The added parens are a small liability. -- Andrei