CL submitted prematurely by mistake.
««« original CL description
spec: clarify index and selector expressions
1) Explain a[i] and a[i:j] where a is of type *A as
shortcut for (*a)[i] and (*a)[i:j], respectively.
2) Together with 1), because len() of nil slices is
well defined, there's no need to special case nil
operands anymore.
3) The result of indexing or slicing a constant string
is always a non-constant byte or string value.
4) The result of slicing an untyped string is a value
of type string.
5) If the operand of a valid slice a[i:j] is nil (i, j
must be 0 for it to be valid - this already follows
from the in-range rules), the result is a nil slice.
Fixes#4913.
Fixes#5951.
R=rsc, r, iant, ken
CC=golang-dev
https://golang.org/cl/11884043
»»»
R=r
CC=golang-dev
https://golang.org/cl/12170046
1) Explain a[i] and a[i:j] where a is of type *A as
shortcut for (*a)[i] and (*a)[i:j], respectively.
2) Together with 1), because len() of nil slices is
well defined, there's no need to special case nil
operands anymore.
3) The result of indexing or slicing a constant string
is always a non-constant byte or string value.
4) The result of slicing an untyped string is a value
of type string.
5) If the operand of a valid slice a[i:j] is nil (i, j
must be 0 for it to be valid - this already follows
from the in-range rules), the result is a nil slice.
Fixes#4913.
Fixes#5951.
R=rsc, r, iant, ken
CC=golang-dev
https://golang.org/cl/11884043
Phrases like "returns whether or not the image is opaque" could be
describing what the function does (it always returns, regardless of
the opacity) or what it returns (a boolean indicating the opacity).
Even when the "or not" is missing, the phrasing is bizarre.
Go with "reports whether", which is still clunky but at least makes
it clear we're talking about the return value.
These were edited by hand. A few were cleaned up in other ways.
R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/11699043
In practice, rejecting an entire structure due to a single invalid byte
in a string is just too picky, and too hard to track down.
Be consistent with the bulk of the standard library by converting
invalid UTF-8 into UTF-8 with replacement runes.
R=golang-dev, crawshaw
CC=golang-dev
https://golang.org/cl/11211045
The notion of a named type is crucial for the definition
of type identity, assignability, definitions of methods.
Explicitly introduce the notion with an extra sentence.
Fixes#5682.
R=r, rsc, iant
CC=golang-dev
https://golang.org/cl/11055043
The existing compilers convert empty strings to empty
but non-nil byte and rune slices. The spec required
a nil byte and rune slice in those cases. That seems
an odd additional requirement. Adjust the spec to
match the reality.
Also, removed over-specification for conversions of
nil []byte and []rune: such nil slices already act
like empty slices and thus don't need extra language.
Added extra examples instead.
Fixes#5704.
R=rsc, r, iant
CC=golang-dev
https://golang.org/cl/10440045
The significant change between TLS 1.0 and 1.1 is the addition of an explicit IV in the case of CBC encrypted records. Support for TLS 1.1 is needed in order to support TLS 1.2.
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/7880043
to avoid unintentionally clobber R9/R10.
Thanks Lucio for the suggestion.
PS: yes, this could be considered a big change (but not an API change), but
as it turns out even temporarily changes R9/R10 in user code is unsafe and
leads to very hard to diagnose problems later, better to disable using R9/R10
when the user first uses it.
See CL 6300043 and CL 6305100 for two problems caused by misusing R9/R10.
R=golang-dev, khr, rsc
CC=golang-dev
https://golang.org/cl/9840043
This fixes two intra-page "type assertion" links that were broken in
different ways.
R=golang-dev, dsymonds
CC=golang-dev
https://golang.org/cl/9797043
This text is added to doc.go:
Explicit argument indexes:
In Printf, Sprintf, and Fprintf, the default behavior is for each
formatting verb to format successive arguments passed in the call.
However, the notation [n] immediately before the verb indicates that the
nth one-indexed argument is to be formatted instead. The same notation
before a '*' for a width or precision selects the argument index holding
the value. After processing a bracketed expression [n], arguments n+1,
n+2, etc. will be processed unless otherwise directed.
For example,
fmt.Sprintf("%[2]d %[1]d\n", 11, 22)
will yield "22, 11", while
fmt.Sprintf("%[3]*[2].*[1]f", 12.0, 2, 6),
equivalent to
fmt.Sprintf("%6.2f", 12.0),
will yield " 12.00". Because an explicit index affects subsequent verbs,
this notation can be used to print the same values multiple times
by resetting the index for the first argument to be repeated:
fmt.Sprintf("%d %d %#[1]x %#x", 16, 17)
will yield "16 17 0x10 0x11".
The notation chosen differs from that in C, but I believe it's easier to read
and to remember (we're indexing the arguments), and compatibility with
C's printf was never a strong goal anyway.
While we're here, change the word "field" to "arg" or "argument" in the
code; it was being misused and was confusing.
R=rsc, bradfitz, rogpeppe, minux.ma, peter.armitage
CC=golang-dev
https://golang.org/cl/9680043
This is a file of hints, not a file of polished text.
Let's not try to do polished text until we start the
release process.
R=golang-dev, gri
CC=golang-dev
https://golang.org/cl/9750043
Several old TODOs are either resolved now (e.g. when is a return
needed), or are from a time the language wasn't frozen (^ for uints
only). Consolidated the others.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/9599044
I read docs and wrote a crawler + link checker on the plane,
which also checks for #fragments. I'll send that out later
when it's less gross.
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/8729050
Although one may argue that they should be legal, gc (at least)
disallows byte order marks that are not the first code point
in the file. Added a sentence to the "Implementation restriction"
clause in the "Source code representation" section to document
this better.
Lifting this restriction (again - the rule has changed at least
twice already) would not break any existing programs, should
we later decide yet again to fiddle the rules about these little
fly specks.
R=golang-dev, dsymonds, gri
CC=golang-dev
https://golang.org/cl/8649043
This version just tells you what to do, rather
than trying to teach you how it all works.
Should be much better for newcomers.
R=dave, gary.burd, alcosholik, r
CC=golang-dev
https://golang.org/cl/8247044
Also:
- put GORACE into the go env command
- do minor housekeeping on the race detector article
Fixes#4995.
R=golang-dev, adg
CC=golang-dev
https://golang.org/cl/8319044
Be deliberately vague, since the precise details should not be depended upon.
Fixes#5155.
R=golang-dev, gri, adg
CC=golang-dev
https://golang.org/cl/8283044
Also remove the introduction, which says what the rest of the
page says anyway.
Fixes#5182.
R=golang-dev, kamil.kisiel, r
CC=golang-dev
https://golang.org/cl/8281044
Mention support for NetBSD, OpenBSD, and cgo for linux/arm.
R=golang-dev, dvyukov, r, minux.ma, adg, bradfitz, adg
CC=golang-dev
https://golang.org/cl/8152043
- removed gratuitous empty lines that creeped into command line output
- changed comment color to a dark green so that links don't visually melt into them
- removed some TODOs
- updated doc.go
R=golang-dev, bradfitz
CC=golang-dev
https://golang.org/cl/8108044
Always use /home/you for $HOME in examples.
Trivial enough that someone else can integrate this change if they are editing go1.1.html
R=r
CC=golang-dev
https://golang.org/cl/8025043
Also:
- more consistenly use "xxx" statement rather than <code>xxx</code> statement
- fix/remove unnecessary links
R=golang-dev, r
CC=golang-dev
https://golang.org/cl/7821050
Will help people find the rules by searching the spec by
having a comment saying "missing return";
"terminating statement" does not evoke the rule to the
uninitiated.
R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/7838044
Also adjust the implementation of applyRelocationsAMD64
so that the test added in CL 6848044 still passes.
R=golang-dev, minux.ma
CC=golang-dev
https://golang.org/cl/7686049
Only the net stuff remains as significant work in the "minor changes" section.
R=golang-dev, dave, elias.naur, rsc
CC=golang-dev
https://golang.org/cl/7933044
The rule is not concistently followed by gc.
It appears that gccgo is ignoring it. go/types
does not implement this rule. However, both
gccgo and now go/types can compile/type-check
the entire std library (and thus all the shift
expressions occuring in it) w/o errors. For
more details see the discussion in issue 4883.
Fixes#4880.
Fixes#4881.
Fixes#4883.
R=rsc, r, iant, ken, ken, mtj, rogpeppe
CC=golang-dev
https://golang.org/cl/7707043
Tell Windows users how to update Mercurial's library.zip to add some missing dependencies.
Fixes#4745.
R=golang-dev, patrick.allen.higgins, minux.ma, adg
CC=golang-dev
https://golang.org/cl/7558043
Also rename the relevant examples and make sure the working one compiles.
R=golang-dev, bradfitz, adg, iant, rsc
CC=golang-dev
https://golang.org/cl/7597043
It's a common mistake to build a recursive String method; explain it well and
show how to avoid it.
R=golang-dev, bradfitz, adg
CC=golang-dev
https://golang.org/cl/7486049
Drop the phrase "reference types", which has caused confusion.
Add a section about 2D arrays, a common newbie question.
R=golang-dev, cespare, adg, rsc
CC=golang-dev
https://golang.org/cl/7423051
The only functional change is the new section
on terminating statements.
There is a minor syntax rewrite (not change)
of function declarations to make it easier to
refer to the notion of a function from all places
where it is used (function decls, method decls,
and function literals).
Includes some minor fixes/additions of missing links.
Based closely on Russ' proposal.
Fixes#65.
R=rsc, r, iant, ken, bradfitz
CC=golang-dev
https://golang.org/cl/7415050
Replacement for CL 7370053 which attempted to make fallthrough's
syntactically a part of switch statements. Because they may be
labeled, fixing that CL completely would require too much spec
surgery.
Fixes#4923.
R=r, iant, rsc, ken
CC=golang-dev
https://golang.org/cl/7416048
