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- language for embedded interfaces (as discussed this morning)

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- fixed a syntax error

R=r
DELTA=17  (15 added, 0 deleted, 2 changed)
OCL=24876
CL=24889
This commit is contained in:
Robert Griesemer 2009-02-11 15:09:15 -08:00
parent 52c02c2d5d
commit 38c232fe37
1 changed files with 17 additions and 2 deletions
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19
doc/go_spec.txt
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@ -1218,7 +1218,7 @@ types (§Types).
StructType = "struct" [ "{" [ FieldDeclList ] "}" ] .
FieldDeclList = FieldDecl { ";" FieldDecl } [ ";" ] .
FieldDecl = (IdentifierList CompleteType | TypeName) [ Tag ] .
FieldDecl = (IdentifierList CompleteType | [ "*" ] TypeName) [ Tag ] .
Tag = StringLit .
// An empty struct.
@ -1387,7 +1387,7 @@ the set of methods specified by the interface type, and the value "nil".
InterfaceType = "interface" [ "{" [ MethodSpecList ] "}" ] .
MethodSpecList = MethodSpec { ";" MethodSpec } [ ";" ] .
MethodSpec = IdentifierList Signature .
MethodSpec = IdentifierList Signature | TypeName .
// An interface specifying a basic File type.
interface {
@ -1425,6 +1425,21 @@ If S1 and S2 also implement
they implement the Lock interface as well as the File interface.
An interface may contain a type name T in place of a method specification.
T must denote another, complete (and not forward-declared) interface type.
Using this notation is equivalent to enumerating the methods of T explicitly
in the interface containing T.
type ReadWrite interface {
Read, Write (b Buffer) bool;
}
type File interface {
ReadWrite; // same as enumerating the methods in ReadWrite
Lock; // same as enumerating the methods in Lock
Close();
}
Forward declaration:
A interface type consisting of only the reserved word "interface" may be used in
a type declaration; it declares an incomplete interface type (§Type declarations).