diff options
Diffstat (limited to 'src/pkg/math/big/rat.go')
| -rw-r--r-- | src/pkg/math/big/rat.go | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/src/pkg/math/big/rat.go b/src/pkg/math/big/rat.go index 75d044fe2..7faee61a4 100644 --- a/src/pkg/math/big/rat.go +++ b/src/pkg/math/big/rat.go @@ -164,8 +164,9 @@ func quotToFloat(a, b nat) (f float64, exact bool) { } // Float64 returns the nearest float64 value for x and a bool indicating -// whether f represents x exactly. The sign of f always matches the sign -// of x, even if f == 0. +// whether f represents x exactly. If the magnitude of x is too large to +// be represented by a float64, f is an infinity and exact is false. +// The sign of f always matches the sign of x, even if f == 0. func (x *Rat) Float64() (f float64, exact bool) { b := x.b.abs if len(b) == 0 { @@ -545,6 +546,9 @@ const ratGobVersion byte = 1 // GobEncode implements the gob.GobEncoder interface. func (x *Rat) GobEncode() ([]byte, error) { + if x == nil { + return nil, nil + } buf := make([]byte, 1+4+(len(x.a.abs)+len(x.b.abs))*_S) // extra bytes for version and sign bit (1), and numerator length (4) i := x.b.abs.bytes(buf) j := x.a.abs.bytes(buf[0:i]) @@ -566,7 +570,9 @@ func (x *Rat) GobEncode() ([]byte, error) { // GobDecode implements the gob.GobDecoder interface. func (z *Rat) GobDecode(buf []byte) error { if len(buf) == 0 { - return errors.New("Rat.GobDecode: no data") + // Other side sent a nil or default value. + *z = Rat{} + return nil } b := buf[0] if b>>1 != ratGobVersion { |