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Merge pull request #4327 from tsbockman/isPowerOf2

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Add `std.math.isPowerOf2()`. Supports floating-point and integers.
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Andrei Alexandrescu 2016-06-16 23:09:02 -04:00 • committed by GitHub
commit 7172eda466
8 changed files with 131 additions and 46 deletions
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3
std/algorithm/iteration.d
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@ -4632,7 +4632,8 @@ if (isForwardRange!R && !isRandomAccessRange!R)
private auto sumPairwiseN(size_t N, bool needEmptyChecks, F, R)(ref R r)
if (isForwardRange!R && !isRandomAccessRange!R)
{
static assert(!(N & (N-1))); //isPow2
import std.math : isPowerOf2;
static assert(isPowerOf2(N));
static if (N == 2) return sumPair!(needEmptyChecks, F)(r);
else return sumPairwiseN!(N/2, needEmptyChecks, F)(r)
+ sumPairwiseN!(N/2, needEmptyChecks, F)(r);