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math/big: shallow copies of Int/Rat/Float are not supported (documentation)

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Fixes #28423.

Change-Id: Ie57ade565d0407a4bffaa86fb4475ff083168e79
Reviewed-on: https://go-review.googlesource.com/c/145537
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2018-10-29 10:24:05 -07:00
parent 9ce87a63b9
commit c86d464734
3 changed files with 21 additions and 1 deletions
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8
src/math/big/float.go
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@ -43,7 +43,7 @@ const debugFloat = false // enable for debugging
// precision of the argument with the largest precision value before any
// rounding takes place, and the rounding mode remains unchanged. Thus,
// uninitialized Floats provided as result arguments will have their
// precision set to a reasonable value determined by the operands and
// precision set to a reasonable value determined by the operands, and
// their mode is the zero value for RoundingMode (ToNearestEven).
//
// By setting the desired precision to 24 or 53 and using matching rounding
@ -56,6 +56,12 @@ const debugFloat = false // enable for debugging
// The zero (uninitialized) value for a Float is ready to use and represents
// the number +0.0 exactly, with precision 0 and rounding mode ToNearestEven.
//
// Operations always take pointer arguments (*Float) rather
// than Float values, and each unique Float value requires
// its own unique *Float pointer. To "copy" a Float value,
// an existing (or newly allocated) Float must be set to
// a new value using the Float.Set method; shallow copies
// of Floats are not supported and may lead to errors.
type Float struct {
prec uint32
mode RoundingMode