Polysemous Values Qustion
davidl
davidl at 126.com
Mon Sep 24 18:19:27 PDT 2007
在 Tue, 25 Sep 2007 08:40:40 +0800,Robert Frser
<fraserofthenight at gmail.com> 写道:
> Can someone giv me an example where polysemous values could apply to a
> class (given the class has (multiple) opImplicitCastTo/From)
I don't understand what you mean by that. Since the lvalue type , and
rvalue type is known.
If I understand you correctly, there won't be such a problem for
assignment expression. Only
happens if there're
void funcoverload(Can_Cast_From_ObjectB_1 A)
void funcoverload(Can_Cast_From_ObjectB_2 C)
funcoverload(ObjectB); <-- this calling is ambiguous. Cause it can cast
to either A or C.
and similar situation is
ObjectB gets the opImplicitTo ObjectC
ObjectA gets the opImplicitFrom ObjectB
so a calling of
void funcoverload(ObjectC c)
void funcoverload(ObjectA a)
funcoverload(ObjectB); <-- this would run into the same problem as the
previous example
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