Type Property

signalingNaN

A signaling NaN (“not a number”).

Declaration

static var signalingNaN: Float { get }

Discussion

The default IEEE 754 behavior of operations involving a signaling NaN is to raise the Invalid flag in the floating-point environment and return a quiet NaN.

Operations on types conforming to the FloatingPoint protocol should support this behavior, but they might also support other options. For example, it would be reasonable to implement alternative operations in which operating on a signaling NaN triggers a runtime error or results in a diagnostic for debugging purposes. Types that implement alternative behaviors for a signaling NaN must document the departure.

Other than these signaling operations, a signaling NaN behaves in the same manner as a quiet NaN.

Relationships

From Protocol

See Also

Accessing Numeric Constants

static var pi: Float

The mathematical constant pi.

static var infinity: Float

Positive infinity.

static var greatestFiniteMagnitude: Float

The greatest finite number representable by this type.

static var nan: Float

A quiet NaN (“not a number”).

static var ulpOfOne: Float

The unit in the last place of 1.0.

static var leastNormalMagnitude: Float

The least positive normal number.

static var leastNonzeroMagnitude: Float

The least positive number.

static var zero: Float

The zero value.