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math/big: document that Rat.SetString accepts _decimal_ float representations 

Updates #29799.

Change-Id: I267c2c3ba3964e96903954affc248d0c52c4916c
Reviewed-on: https://go-review.googlesource.com/c/158397
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Robert Griesemer 2019-01-17 14:49:30 -08:00
parent 6e9f664b9a
commit 33caf3be83
1 changed files with 3 additions and 2 deletions
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5
src/math/big/ratconv.go
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@ -38,8 +38,8 @@ func (z *Rat) Scan(s fmt.ScanState, ch rune) error {
} }
// SetString sets z to the value of s and returns z and a boolean indicating // SetString sets z to the value of s and returns z and a boolean indicating
// success. s can be given as a fraction "a/b" or as a floating-point number // success. s can be given as a fraction "a/b" or as a decimal floating-point
// optionally followed by an exponent. The entire string (not just a prefix) // number optionally followed by an exponent. The entire string (not just a prefix)
// must be valid for success. If the operation failed, the value of z is // must be valid for success. If the operation failed, the value of z is
// undefined but the returned value is nil. // undefined but the returned value is nil.
func (z *Rat) SetString(s string) (*Rat, bool) { func (z *Rat) SetString(s string) (*Rat, bool) {
@ -78,6 +78,7 @@ func (z *Rat) SetString(s string) (*Rat, bool) {
} }
// mantissa // mantissa
// TODO(gri) allow other bases besides 10 for mantissa and exponent? (issue #29799)
var ecorr int var ecorr int
z.a.abs, _, ecorr, err = z.a.abs.scan(r, 10, true) z.a.abs, _, ecorr, err = z.a.abs.scan(r, 10, true)
if err != nil { if err != nil {