I'm planning to create a macro-based property system (reflection,
automatic serializing for properties, that kind of stuff). The system
would involve writing some PROPERTY(propNa me) macros between a
BEGIN_CLASS(Thi sClass) and an END_CLASS() macro. The PROPERTY macros
should somehow know ThisClass, and that's where it start to get tricky.
A #define ThisClass would of course help, but I'd rather make it part
of the BEGIN_CLASS macro, and #defines can't be inside a macro body.
A typedef inside BEGIN_CLASS is almost good, except that a single
source file may contain multiple class definitions, and the second
BEGIN_CLASS would redefine ThisClass, causing a compile error. I also
can't put the whole thing (the typedef and the PROPERTY macros) inside
a namespace, cause PROPERTY should define some member functions of a
class declared outside of that namespace.
Now if there would be anything that can be defined outside of
functions, and be redefined later, and also be used as a template
argument, then I think the problem could be solved with template
specializations . BEGIN_CLASS would redefine that something, then create
a new specialization of a template for the new 'value', and put a
typedef for ThisClass inside that specialization. PROPERTY macros could
then easily use that typedef.
What I really need is something that can be used as a template
argument, and can be made invariant for a specific part of the code,
then changed for another part.
Unfortunately, I can't think of anything that would fit the bill. Any
ideas? Maybe any other ideas for simulating typedef redefinition (other
than #define / #undef)?
(And yes, you're right, it's not really that big an issue, it's more
curiosity on my side than a real problem.)
Imre 0 1481 This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Xiangliang Meng |
last post by:
Hi, all.
When reading C++ books, I'm alway confused by those terms "redefining
functions", "overloading functions" and "overriding functions".
Please give me some comments on those terms. Thanks.
If giving more strategy hehind them, more helpful.
Best Regards,
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by: bberu |
last post by:
Hi,
I know it is possible to refine operators (like +, -, * or /) on classes.
But is it possible on simple types ?
ex :
If I have a type like :
typedef int vector
is it possible to redefine a + operator on the vetor type ?
Thanks !
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