qbit/go
1
0
Fork 0
mirror of https://github.com/golang/go synced 2024-11-21 23:34:42 -07:00
Code Releases Activity

A small but powerful change in constant declarations. Proposal by ken

Browse Source 
after some discussion about enums. Implementation should be trivial.
Wording in the doc should be improved, probably.

SVN=125946
This commit is contained in:
Robert Griesemer 2008-07-03 13:19:07 -07:00
parent ed9743dc3a
commit de5442893d
1 changed files with 20 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
doc/go_lang.txt
View File

@ -4,7 +4,7 @@ The Go Programming Language (DRAFT)
Robert Griesemer, Rob Pike, Ken Thompson
----
(July 1, 2008)
(July 3, 2008)
This document is a semi-formal specification/proposal for a new
systems programming language. The document is under active
@ -983,7 +983,7 @@ Const declarations
A constant declaration gives a name to the value of a constant expression.
ConstDecl = "const" ( ConstSpec | "(" ConstSpecList [ ";" ] ")" ).
ConstSpec = identifier [ Type ] "=" Expression .
ConstSpec = identifier [ Type ] [ "=" Expression ] .
ConstSpecList = ConstSpec { ";" ConstSpec }.
const pi float = 3.14159265
@ -993,6 +993,23 @@ A constant declaration gives a name to the value of a constant expression.
two = 3
)
The constant expression may be omitted, in which case the expression is
the last expression used after the "const" keyword. If no such expression
exists, the constant expression cannot be omitted.
Together with the 'iota' constant generator this permits light-weight
declaration of ``enum'' values.
const (
illegal = iota;
eof;
ident;
string;
number;
)
TODO move/re-arrange section on iota.
Type declarations
----
@ -1453,6 +1470,7 @@ and integers. A library may be provided under restricted circumstances
to acccess this conversion in low-level code but it will not be available
in general.
The constant generator 'iota'
----