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Diffstat (limited to 'kube2msb/src/vendor/gopkg.in/inf.v0/rounder.go')
-rw-r--r-- | kube2msb/src/vendor/gopkg.in/inf.v0/rounder.go | 145 |
1 files changed, 0 insertions, 145 deletions
diff --git a/kube2msb/src/vendor/gopkg.in/inf.v0/rounder.go b/kube2msb/src/vendor/gopkg.in/inf.v0/rounder.go deleted file mode 100644 index 3a97ef5..0000000 --- a/kube2msb/src/vendor/gopkg.in/inf.v0/rounder.go +++ /dev/null @@ -1,145 +0,0 @@ -package inf - -import ( - "math/big" -) - -// Rounder represents a method for rounding the (possibly infinite decimal) -// result of a division to a finite Dec. It is used by Dec.Round() and -// Dec.Quo(). -// -// See the Example for results of using each Rounder with some sample values. -// -type Rounder rounder - -// See http://speleotrove.com/decimal/damodel.html#refround for more detailed -// definitions of these rounding modes. -var ( - RoundDown Rounder // towards 0 - RoundUp Rounder // away from 0 - RoundFloor Rounder // towards -infinity - RoundCeil Rounder // towards +infinity - RoundHalfDown Rounder // to nearest; towards 0 if same distance - RoundHalfUp Rounder // to nearest; away from 0 if same distance - RoundHalfEven Rounder // to nearest; even last digit if same distance -) - -// RoundExact is to be used in the case when rounding is not necessary. -// When used with Quo or Round, it returns the result verbatim when it can be -// expressed exactly with the given precision, and it returns nil otherwise. -// QuoExact is a shorthand for using Quo with RoundExact. -var RoundExact Rounder - -type rounder interface { - - // When UseRemainder() returns true, the Round() method is passed the - // remainder of the division, expressed as the numerator and denominator of - // a rational. - UseRemainder() bool - - // Round sets the rounded value of a quotient to z, and returns z. - // quo is rounded down (truncated towards zero) to the scale obtained from - // the Scaler in Quo(). - // - // When the remainder is not used, remNum and remDen are nil. - // When used, the remainder is normalized between -1 and 1; that is: - // - // -|remDen| < remNum < |remDen| - // - // remDen has the same sign as y, and remNum is zero or has the same sign - // as x. - Round(z, quo *Dec, remNum, remDen *big.Int) *Dec -} - -type rndr struct { - useRem bool - round func(z, quo *Dec, remNum, remDen *big.Int) *Dec -} - -func (r rndr) UseRemainder() bool { - return r.useRem -} - -func (r rndr) Round(z, quo *Dec, remNum, remDen *big.Int) *Dec { - return r.round(z, quo, remNum, remDen) -} - -var intSign = []*big.Int{big.NewInt(-1), big.NewInt(0), big.NewInt(1)} - -func roundHalf(f func(c int, odd uint) (roundUp bool)) func(z, q *Dec, rA, rB *big.Int) *Dec { - return func(z, q *Dec, rA, rB *big.Int) *Dec { - z.Set(q) - brA, brB := rA.BitLen(), rB.BitLen() - if brA < brB-1 { - // brA < brB-1 => |rA| < |rB/2| - return z - } - roundUp := false - srA, srB := rA.Sign(), rB.Sign() - s := srA * srB - if brA == brB-1 { - rA2 := new(big.Int).Lsh(rA, 1) - if s < 0 { - rA2.Neg(rA2) - } - roundUp = f(rA2.Cmp(rB)*srB, z.UnscaledBig().Bit(0)) - } else { - // brA > brB-1 => |rA| > |rB/2| - roundUp = true - } - if roundUp { - z.UnscaledBig().Add(z.UnscaledBig(), intSign[s+1]) - } - return z - } -} - -func init() { - RoundExact = rndr{true, - func(z, q *Dec, rA, rB *big.Int) *Dec { - if rA.Sign() != 0 { - return nil - } - return z.Set(q) - }} - RoundDown = rndr{false, - func(z, q *Dec, rA, rB *big.Int) *Dec { - return z.Set(q) - }} - RoundUp = rndr{true, - func(z, q *Dec, rA, rB *big.Int) *Dec { - z.Set(q) - if rA.Sign() != 0 { - z.UnscaledBig().Add(z.UnscaledBig(), intSign[rA.Sign()*rB.Sign()+1]) - } - return z - }} - RoundFloor = rndr{true, - func(z, q *Dec, rA, rB *big.Int) *Dec { - z.Set(q) - if rA.Sign()*rB.Sign() < 0 { - z.UnscaledBig().Add(z.UnscaledBig(), intSign[0]) - } - return z - }} - RoundCeil = rndr{true, - func(z, q *Dec, rA, rB *big.Int) *Dec { - z.Set(q) - if rA.Sign()*rB.Sign() > 0 { - z.UnscaledBig().Add(z.UnscaledBig(), intSign[2]) - } - return z - }} - RoundHalfDown = rndr{true, roundHalf( - func(c int, odd uint) bool { - return c > 0 - })} - RoundHalfUp = rndr{true, roundHalf( - func(c int, odd uint) bool { - return c >= 0 - })} - RoundHalfEven = rndr{true, roundHalf( - func(c int, odd uint) bool { - return c > 0 || c == 0 && odd == 1 - })} -} |