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math/big: document that Sqrt doesn't set Accuracy

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Document that the Float.Sqrt method does not set the receiver's
Accuracy field.

Updates #37915

Change-Id: Ief1dcac07eacc0ef02f86bfac9044501477bca1c
Reviewed-on: https://go-review.googlesource.com/c/go/+/224497
Reviewed-by: Robert Griesemer <gri@golang.org>
This commit is contained in:
Alberto Donizetti 2020-03-20 19:13:07 +01:00 • committed by Robert Griesemer
parent d965bb6130
commit c5058652fd
2 changed files with 5 additions and 2 deletions
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4
src/math/big/float.go
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@ -224,7 +224,9 @@ func (x *Float) Mode() RoundingMode {
return x.mode return x.mode
} }
// Acc returns the accuracy of x produced by the most recent operation. // Acc returns the accuracy of x produced by the most recent
// operation, unless explicitly documented otherwise by that
// operation.
func (x *Float) Acc() Accuracy { func (x *Float) Acc() Accuracy {
return x.acc return x.acc
} }

3
src/math/big/sqrt.go
View file

@ -14,7 +14,8 @@ var (
// //
// If z's precision is 0, it is changed to x's precision before the // If z's precision is 0, it is changed to x's precision before the
// operation. Rounding is performed according to z's precision and // operation. Rounding is performed according to z's precision and
// rounding mode. // rounding mode, but z's accuracy is not computed. Specifically, the
// result of z.Acc() is undefined.
// //
// The function panics if z < 0. The value of z is undefined in that // The function panics if z < 0. The value of z is undefined in that
// case. // case.