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Template std.meta.templateOr
Combines several template predicates using logical OR, i.e. constructs a new predicate which evaluates to true for a given input T if and only at least one of the passed predicates is true for T.
The predicates are evaluated from left to right, aborting evaluation in a short-cut manner if a true result is encountered, in which case the latter instantiations do not need to compile.
Arguments
template templateOr(Preds...);
Example
import std.traits : isPointer, isUnsigned; alias isPtrOrUnsigned = templateOr!(isPointer, isUnsigned); static assert( isPtrOrUnsigned!uint && isPtrOrUnsigned!(short*)); static assert(!isPtrOrUnsigned!int && !isPtrOrUnsigned!(string)); // An empty list of predicates never yields true. alias alwaysFalse = templateOr!(); static assert(!alwaysFalse!int);