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Preparation for varargs: Proposal for syntax.

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Robert Griesemer 2008-10-24 13:13:12 -07:00
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doc/go_spec.txt
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@ -4,7 +4,7 @@ The Go Programming Language Specification (DRAFT)
Robert Griesemer, Rob Pike, Ken Thompson Robert Griesemer, Rob Pike, Ken Thompson
---- ----
(October 23, 2008) (October 24, 2008)
This document is a semi-formal specification of the Go systems This document is a semi-formal specification of the Go systems
@ -1269,7 +1269,7 @@ and result types.
FunctionType = "(" [ ParameterList ] ")" [ Result ] . FunctionType = "(" [ ParameterList ] ")" [ Result ] .
ParameterList = ParameterDecl { "," ParameterDecl } . ParameterList = ParameterDecl { "," ParameterDecl } .
ParameterDecl = [ IdentifierList ] Type . ParameterDecl = [ IdentifierList ] ( Type | "..." ) .
Result = Type | "(" ParameterList ")" . Result = Type | "(" ParameterList ")" .
In ParameterList, the parameter names (IdentifierList) either must all be In ParameterList, the parameter names (IdentifierList) either must all be
@ -1277,13 +1277,20 @@ present, or all be absent. If the parameters are named, each name stands
for one parameter of the specified type. If the parameters are unnamed, each for one parameter of the specified type. If the parameters are unnamed, each
type stands for one parameter of that type. type stands for one parameter of that type.
For the last incoming parameter only, instead of a parameter type one
may write "...". The ellipsis indicates that the last parameter stands
for an arbitrary number of additional arguments of any type (including
no additional arguments). If the parameters are named, the identifier
list immediately preceding "..." must contain only one identifier (the
name of the last parameter).
() ()
(x int) (x int)
() int () int
(string) (string, float, ...)
(a, b int, z float) bool (a, b int, z float) bool
(a, b int, z float) (bool) (a, b int, z float) (bool)
(a, b int, z float) (success bool) (a, b int, z float, opt ...) (success bool)
(int, int, float) (float, *[]int) (int, int, float) (float, *[]int)
A variable can hold only a pointer to a function, not a function value. A variable can hold only a pointer to a function, not a function value.