Solution to "statement is not reachable" depending on template variables?
Johan Engelen via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Wed Mar 16 10:35:53 PDT 2016
On Wednesday, 16 March 2016 at 17:34:13 UTC, Steven Schveighoffer
wrote:
> On 3/16/16 7:18 AM, Johan Engelen wrote:
>> Hi all,
>> I've found discussions, but not an actual "recommended"
>> solution for
>> the problem of "statement is not reachable" warnings in
>> templates with
>> early returns, e.g.:
>> ```
>> bool nobool(T...)() {
>> foreach (i, U; T) {
>> static if (is(U == bool)) {
>> return false;
>> }
>> }
>> return true; // emits "Warning: statement is not
>> reachable"
>> }
>
> Instead of foreach, you could use recursive mechanism. Not
> ideal, but it would work.
>
> Another possibility:
>
> foreach(i, U; T) {
> static if(is(U == bool)) {
> return false;
> } else static if(i + 1 == T.length) {
> return true;
> }
> }
I like your second solution, it's clever :)
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