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- clarification of type of array literals (always fixed array)

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- clarification of const decl syntax

R=r
DELTA=9  (4 added, 0 deleted, 5 changed)
OCL=14771
CL=14771
This commit is contained in:
Robert Griesemer 2008-09-03 16:41:31 -07:00
parent 5ee2b0478a
commit f5cb258195
1 changed files with 8 additions and 5 deletions
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13
doc/go_spec.txt
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@ -459,8 +459,9 @@ Const declarations
A constant declaration gives a name to the value of a constant expression. A constant declaration gives a name to the value of a constant expression.
ConstDecl = "const" ( ConstSpec | "(" ConstSpecList [ ";" ] ")" ). ConstDecl = "const" ( ConstSpec | "(" ConstSpecList [ ";" ] ")" ).
ConstSpec = identifier [ Type ] [ "=" Expression ] . ConstSpec = identifier [ Type ] "=" Expression .
ConstSpecList = ConstSpec { ";" ConstSpec }. ConstSpecList = ConstSpec { ";" ConstSpecOptExpr }.
ConstSpecOptExpr = identifier [ Type ] [ "=" Expression ] .
const pi float = 3.14159265 const pi float = 3.14159265
const e = 2.718281828 const e = 2.718281828
@ -1140,10 +1141,12 @@ we can write
pi := Num(Rat(22,7), 3.14159, "pi") pi := Num(Rat(22,7), 3.14159, "pi")
For array literals, if the size is present the constructed array has that many For array literals, if the length is present the constructed array has that many
elements; trailing elements are given the approprate zero value for that type. elements; trailing elements are given the approprate zero value for that type.
If it is absent, the size of the array is the number of elements. It is an error If it is absent, the length of the array is the number of elements. It is an error
if a specified size is less than the number of elements in the expression list. if the specified length is less than the number of elements in the expression list.
In either case, the length is known at compile type and thus the type of an
array literal is always a fixed array type.
primes := [6]int(2, 3, 5, 7, 9, 11) primes := [6]int(2, 3, 5, 7, 9, 11)
weekdays := []string("mon", "tue", "wed", "thu", "fri", "sat", "sun") weekdays := []string("mon", "tue", "wed", "thu", "fri", "sat", "sun")