On 2 Oct 2007, at 23:48, Randy Smith wrote:
I'm trying to incorporate c++ stl constructs into the %union { }
block of yacc. Specifically, I'm trying to do something similar to
this:
%union {
...
std::list<unsigned int>* int_list;
...
}
This yields the error:
eidd.y:100: error: using-declaration for non-member at class scope
eidd.y:100: error: expected `;' before '<' token
One solution to this (and the solution I used), is to define
a simple class that wraps a pointer of this type. This works fine,
but
it is a bit of a kludge, and I'm really curious why the direct stl
reference doesn't work. Can anybody explain this to me or point me
to a reference?
I think this might be a problem with the C++ compiler or a limitation
of the C++ standard, because you try to instantiate a pointer to a
template class, not the class itself. Bison just implements '%union
{...}' verbatim as 'union {...}'. So perhaps write something before
that ensures the instantiation of the pointer, experimenting in a
separate file with what Bison implements.
Hans Aberg
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