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Re: too many warnings from Bison CVS for Pike

From: Hans Aberg
Subject: Re: too many warnings from Bison CVS for Pike
Date: Wed, 22 Feb 2006 01:11:29 +0100

On 21 Feb 2006, at 19:34, Joel E. Denny wrote:

If this usage is fine, then I wonder how "lalr1.cc" supports non- POD types
more than "yacc.c".  A footnote in the same section says that
`pseudo-unions' may alleviate this need for pointers in the future.

I just use a C++ polymorphic variable, created by a class hierarchy where all classes are derived from a root class with a reference count in it, to avoid unnecessary copying. Then the semantic type is a non-POD class maintaining a dynamically moving pointer to this class hierarchy. Type conversions are done using dynamic_cast, which calls for runtime conversions, but I think one should be able to use Bison's static type system to make these conversions using static_cast instead, thus computable at compile time. This is sort of the C++ variation of doing the same thing in C.

  Hans Aberg

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