"Daniel O'Connell [C# MVP]" <onyxkirx@--NOSPAM--comcast.net> wrote in
message news:ug**************@TK2MSFTNGP11.phx.gbl...
"Alex Sedow" <al*******@mail.ru> wrote in message
news:OO**************@TK2MSFTNGP14.phx.gbl... Why interface-event-declaration does not support multiple declarators
like event-declaration?
Grammar from C# spec:
variable-declarators:
variable-declarator
variable-declarators "," variable-declarator
variable-declarator:
identifier
identifier "=" variable-initializer
event-declaration:
[attributes] [event-modifiers] "event" type variable-declarators ";"
interface-event-declaration:
[attributes] ["new"] "event" type identifier ";"
For example grammar for interface-event-declaration may looks like this:
interface-variable-declarator:
interface-variable-declarator
interface-variable-declarator "," interface-variable-declarator
interface-variable-declarator:
identifier
interface-event-declaration:
[attributes] ["new"] "event" type interface-variable-declarators ";"
I can't say for sure, but interfaces cannot define variables, only event
properties, unlike what happens in other types(which generates both an
event property and a local field). I would imagine it is done to maintain
consistency with other interface declarations.
Ok. Let's rename interface-variable-declarator with
interface-event-declarator:
interface-event-declarators:
interface-event-declarator
interface-event-declarator "," interface-event-declarator
interface-event-declarator:
identifier
interface-event-declaration:
[attributes] ["new"] "event" type interface-event-declarators ";"
C# examples:
class C
{
event EventType a, b;
// equal to
event EventType a;
event EventType b;
}
interface I
{
event EventType a, b; // syntax error
// equal to
event EventType a; // ok
event EventType b; // ok
}
Alex.
