truncPow2

Gives the last power of two before val. $(T) can be any built-in numerical type.

T truncPow2(T val)
T
truncPow2
(
T
)
(
const T val
)
if (
isIntegral!T
)
T truncPow2(T val)

Parameters

val T: any number

Return Value

Type: T

the last power of two before val

Examples

assert(truncPow2(3) == 2);
assert(truncPow2(4) == 4);
assert(truncPow2(10) == 8);
assert(truncPow2(4000) == 2048);

assert(truncPow2(-5) == -4);
assert(truncPow2(-20) == -16);

assert(truncPow2(uint.max) == int.max + 1);
assert(truncPow2(uint.min) == 0);
assert(truncPow2(ulong.max) == long.max + 1);
assert(truncPow2(ulong.min) == 0);

assert(truncPow2(int.max) == (int.max / 2) + 1);
assert(truncPow2(int.min) == int.min);
assert(truncPow2(long.max) == (long.max / 2) + 1);
assert(truncPow2(long.min) == long.min);

assert(truncPow2(2.1) == 2.0);
assert(truncPow2(7.0) == 4.0);
assert(truncPow2(-1.9) == -1.0);
assert(truncPow2(0.24) == 0.125);
assert(truncPow2(-7.0) == -4.0);

assert(truncPow2(double.infinity) == double.infinity);

truncPow2

Parameters

Return Value

Examples

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