g++ permissiveness?

[Stephane Del Pino <delpino at ann dot jussieu dot fr>]

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Hi there.

I have noticed some strange behaviour of the compiler on the following example
but I am not sure if the compiler acts well or just misses the syntax
error... Could some one enlighten my view?

- --8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<---
struct A
{
};


int main()
{
   const A& a = a;
   const A& b = dynamic_cast<const A&>(b);

   A& c = c;
   A& d = dynamic_cast<A&>(d);

   const double& e = e;
   const double& f = dynamic_cast<const double&>(f);

   double& g = g;
   double& h = dynamic_cast<double&>(h);

   const double& i = static_cast<const double&>(i);

   return 0;
}
- --8<-----8<-----8<-----8<-----8<-----8<-----8<-----8<---

The above code obiousely does not compile but if the lines 15 and 18 are
commented, it does! This is what I do not understand...

With g++-3.2 I get the following message (the same is obtained with 2.95 and
3.0)...

question.cpp: In function `int main()':
question.cpp:15: cannot dynamic_cast `f' (of type `const double') to type `
   const double&' (target is not pointer or reference to class)
question.cpp:18: cannot dynamic_cast `h' (of type `double') to type `double&'
(
   target is not pointer or reference to class)


Best regards,
Stephane.
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