[swift-evolution] [Proposal] Add floor() and ceiling() functions to FloatingPoint
scanon at apple.com
Fri Jul 1 10:38:50 CDT 2016
These are already included with SE-0067, we’re just working on finishing up the implementation.
/// Remainder of `self` divided by `other`. This is the IEEE 754 remainder
/// For finite `self` and `other`, the remainder `r` is defined by
/// `r = self - other*n`, where `n` is the integer nearest to `self/other`.
/// (Note that `n` is *not* `self/other` computed in floating-point
/// arithmetic, and that `n` may not even be representable in any available
/// integer type). If `self/other` is exactly halfway between two integers,
/// `n` is chosen to be even.
/// It follows that if `self` and `other` are finite numbers, the remainder
/// `r` satisfies `-|other|/2 <= r` and `r <= |other|/2`.
/// `remainder` is always exact.
func remainder(dividingBy other: Self) -> Self
/// Mutating form of `remainder`.
mutating func formRemainder(dividingBy other: Self)
/// Remainder of `self` divided by `other` using truncating division.
/// Equivalent to the C standard library function `fmod`.
/// If `self` and `other` are finite numbers, the truncating remainder
/// `r` has the same sign as `other` and is strictly smaller in magnitude.
/// It satisfies `r = self - other*n`, where `n` is the integral part
/// of `self/other`.
/// `truncatingRemainder` is always exact.
func truncatingRemainder(dividingBy other: Self) -> Self
/// Mutating form of `truncatingRemainder`.
mutating func formTruncatingRemainder(dividingBy other: Self)
/// Square root of `self`.
func squareRoot() -> Self
/// Mutating form of square root.
mutating func formSquareRoot()
/// `self + lhs*rhs` computed without intermediate rounding. Implements the
/// IEEE 754 `fusedMultiplyAdd` operation.
func addingProduct(_ lhs: Self, _ rhs: Self) -> Self
/// Fused multiply-add, accumulating the product of `lhs` and `rhs` to `self`.
mutating func addProduct(_ lhs: Self, _ rhs: Self)
> On Jul 1, 2016, at 4:06 AM, Björn Forster via swift-evolution <swift-evolution at swift.org> wrote:
> Hello Karl and everyone else involved,
> an IEEE754 conform floating point implementation requires also squrt and a remainer function being provided by the respective float implementation. Shouldn't these two be also added to the FloatingPoint protocol now that the rounding functions are being added?
> Kind Regards,
> swift-evolution mailing list
> swift-evolution at swift.org
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