[cfe-dev] [Proposal] How i plan to implement operator __uuidof

[Francois Pichet]

Here is my plan on how to implement the __uuidof operator.
doc: http://msdn.microsoft.com/en-us/library/zaah6a61(v=VS.90).aspx


For each class with an uuid attribute, clang would insert an implicit
declaration of type: VarDecl.

For example:

  struct __declspec(uuid("00000000-0000-0000-0000-000000000001"))
  type_uuid { };

will add an implicit VarDecl looking like this:
  _GUID  implicit_no_name = { 0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 1} };


A _GUID structure looks like this:

struct _GUID {
    unsigned long  Data1;
    unsigned short Data2;
    unsigned short Data3;
    unsigned char  Data4[ 8 ];
};

A pointer to the implicit VarDecl object will be saved in the UuidAttr class
for later retrieval.
__uuidof will return a const reference to that VarDecl object.


Also, given this code:
template <const _GUID*> class T {};
T<&__uuidof(var)> foo;

The function CheckTemplateArgumentAddressOfObjectOrFunction will need to be
modified to accept an expression of type CXXUuidofExpr as "ArgIn"

All this only under -fms-extensions of course...
Any comments or potential problems with this approach?
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