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Function std.math.algebraic.nextPow2

Gives the next power of two after val. T can be any built-in numerical type.

T nextPow2(T) (
  const T val
if (isIntegral!T);

T nextPow2(T) (
  const T val
if (isFloatingPoint!T);

If the operation would lead to an over/underflow, this function will return 0.


val any number


the next power of two after val


writeln(nextPow2(2)); // 4
writeln(nextPow2(10)); // 16
writeln(nextPow2(4000)); // 4096

writeln(nextPow2(-2)); // -4
writeln(nextPow2(-10)); // -16

writeln(nextPow2(uint.max)); // 0
writeln(nextPow2(uint.min)); // 0
writeln(nextPow2(size_t.max)); // 0
writeln(nextPow2(size_t.min)); // 0

writeln(nextPow2(int.max)); // 0
writeln(nextPow2(int.min)); // 0
writeln(nextPow2(long.max)); // 0
writeln(nextPow2(long.min)); // 0


writeln(nextPow2(2.1)); // 4.0
writeln(nextPow2(-2.0)); // -4.0
writeln(nextPow2(0.25)); // 0.5
writeln(nextPow2(-4.0)); // -8.0

writeln(nextPow2(double.max)); // 0.0
writeln(nextPow2(double.infinity)); // double.infinity


Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger


Boost License 1.0.