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enum isBidirectionalRange(R) = isForwardRange!R && is(typeof((R r) => r
.popBack)) && (is(typeof((return ref R r) => r .back)) || is(typeof((return ref R r) ref => r .back))) && is(typeof(R .init .back .init) == ElementType!R);
The semantics of a bidirectional range (not checkable during
compilation) are assumed to be the following (
r is an object of
rreturns (possibly a reference to) the last element in the range. Calling
ris allowed only if calling
rhas, or would have, returned
The header of
std for tutorials on ranges.