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Function std.math.algebraic.truncPow2
Gives the last power of two before val
. <>> can be any built-in
numerical type.
T truncPow2(T)
(
const T val
)
if (isIntegral!T);
T truncPow2(T)
(
const T val
)
if (isFloatingPoint!T);
Parameters
Name | Description |
---|---|
val | any number |
Returns
the last power of two before val
Example
writeln(truncPow2(3)); // 2
writeln(truncPow2(4)); // 4
writeln(truncPow2(10)); // 8
writeln(truncPow2(4000)); // 2048
writeln(truncPow2(-5)); // -4
writeln(truncPow2(-20)); // -16
writeln(truncPow2(uint .max)); // int.max + 1
writeln(truncPow2(uint .min)); // 0
writeln(truncPow2(ulong .max)); // long.max + 1
writeln(truncPow2(ulong .min)); // 0
writeln(truncPow2(int .max)); // (int.max / 2) + 1
writeln(truncPow2(int .min)); // int.min
writeln(truncPow2(long .max)); // (long.max / 2) + 1
writeln(truncPow2(long .min)); // long.min
Example
writeln(truncPow2(2.1)); // 2.0
writeln(truncPow2(7.0)); // 4.0
writeln(truncPow2(-1.9)); // -1.0
writeln(truncPow2(0.24)); // 0.125
writeln(truncPow2(-7.0)); // -4.0
writeln(truncPow2(double .infinity)); // double.infinity
Authors
Walter Bright, Don Clugston, Conversion of CEPHES math library to D by Iain Buclaw and David Nadlinger
License
Copyright © 1999-2022 by the D Language Foundation | Page generated by ddox.