code review 3423041: go spec: remove predeclared types float, complex in fav...

go spec: remove predeclared types float, complex in favor of float64 and complex128

The default float type is not very useful but for the most basic applications.
For instance, as it is now, using the math package requires conversions for float
variables (the arguments for math functions are usually float64). Typical real
applications tend to specify the floating point precision required.

This proposal removes the predeclared types float and complex. Variable declarations
without type specification but with constant floating point or complex initializer
expressions will assume the type float64 or complex128 respectively.

The predeclared function complx is renamed to complex.

[r, 2011-01-18 22:38:56]

LGTM

[gri, 2011-01-18 22:57:24]

Hello golang-dev@googlegroups.com (cc: golang-dev@googlegroups.com),

I'd like you to review this change.

[gri, 2011-01-18 23:01:55]

We (the Go team) is planing to remove the predeclared types float and
complex
in favor of float64 and complex128 as outlined in the language spec proposal
below.

It will take a little while for the change to roll out as compilers and the
library
will need to be adjusted; this is simply a heads up and a review request.

- gri

On Tue, Jan 18, 2011 at 2:57 PM, <gri@golang.org> wrote:

> Reviewers: golang-dev_googlegroups.com,
>
> Message:
> Hello golang-dev@googlegroups.com (cc: golang-dev@googlegroups.com),
>
> I'd like you to review this change.
>
>
> Description:
> go spec: remove predeclared types float, complex in favor of float64 and
> complex128
>
> The default float type is not very useful but for the most basic
> applications.
> For instance, as it is now, using the math package requires conversions
> for float
> variables (the arguments for math functions are usually float64).
> Typical real
> applications tend to specify the floating point precision required.
>
> This proposal removes the predeclared types float and complex. Variable
> declarations
> without type specification but with constant floating point or complex
> initializer
> expressions will assume the type float64 or complex128 respectively.
>
> Please review this at http://codereview.appspot.com/3423041/
>
> Affected files:
>  M doc/go_spec.html
>
>
>

[rsc, 2011-01-18 23:41:50]

i have a tree with almost all the changes made
to keep things building.  (it does not change go/parser
but does change just about everything else that knows
about float.)

will send out as a separate review later.

[rsc, 2011-01-19 01:21:40]

perhaps not for this CL, but deleting float and complex
opens the possibility of spelling cmplx with vowels.

russ

[gri, 2011-01-19 02:44:08]

Hello golang-dev@googlegroups.com, rsc (cc: golang-dev@googlegroups.com),

Please take another look.

[rsc, 2011-01-19 03:57:58]

LGTM

[rsc, 2011-01-20 03:07:52]

will clpatch and submit with the other float changes

[rsc, 2011-01-20 04:07:24]

*** Submitted as 03dec884e152 ***

go spec: remove float, complex in favor of float64 and complex128

The default float type is not very useful but for the most basic applications.
For instance, as it is now, using the math package requires conversions for
float
variables (the arguments for math functions are usually float64). Typical real
applications tend to specify the floating point precision required.

This proposal removes the predeclared types float and complex. Variable
declarations
without type specification but with constant floating point or complex
initializer
expressions will assume the type float64 or complex128 respectively.

The predeclared function cmplx is renamed to complex.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/3423041

Committer: Russ Cox <rsc@golang.org>