Function classify

Returns whether x is a NaN, zero, infinity, subnormal or normalized number.

FloatingPointClass classify(F) (
  F x
)
if (isFloatingPoint!F);

This function doesn't distinguish between negative and positive infinity, negative and positive NaN or negative and positive zero.

Parameters

NameDescription
F Type of the floating point number.
x Floating point number.

Returns

Classification of x.

Example

assert(classify(0.0) == FloatingPointClass.zero);
assert(classify(double.nan) == FloatingPointClass.nan);
assert(classify(double.infinity) == FloatingPointClass.infinite);
assert(classify(-double.infinity) == FloatingPointClass.infinite);
assert(classify(1.4) == FloatingPointClass.normal);
assert(classify(1.11254e-307 / 10) == FloatingPointClass.subnormal);

assert(classify(0.0f) == FloatingPointClass.zero);
assert(classify(float.nan) == FloatingPointClass.nan);
assert(classify(float.infinity) == FloatingPointClass.infinite);
assert(classify(-float.infinity) == FloatingPointClass.infinite);
assert(classify(0.3) == FloatingPointClass.normal);
assert(classify(5.87747e-38f / 10) == FloatingPointClass.subnormal);

assert(classify(0.0L) == FloatingPointClass.zero);
assert(classify(real.nan) == FloatingPointClass.nan);
assert(classify(real.infinity) == FloatingPointClass.infinite);
assert(classify(-real.infinity) == FloatingPointClass.infinite);