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POC callback functions defined in an unnamed namespace?
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copied!<p>I have a C++ project that uses a C bison parser. The C parser uses a struct of function pointers to call functions that create proper AST nodes when productions are reduced by bison:</p> <pre><code>typedef void Node; struct Actions { Node *(*newIntLit)(int val); Node *(*newAsgnExpr)(Node *left, Node *right); /* ... */ }; </code></pre> <p>Now, in the C++ part of the project, i fill those pointers</p> <pre><code>class AstNode { /* ... */ }; class IntLit : public AstNode { /* ... */ }; extern "C" { Node *newIntLit(int val) { return (Node*)new IntLit(val); } /* ... */ } Actions createActions() { Actions a; a.newIntLit = &newIntLit; /* ... */ return a; } </code></pre> <p>Now the only reason i put them within <code>extern "C"</code> is because i want them to have C calling conventions. But optimally, i would like their names still be mangled. They are never called by-name from C code, so name mangling isn't an issue. Having them mangled will avoid name conflicts, since some actions are called like <code>error</code>, and the C++ callback function has ugly names like the following just to avoid name clashes with other modules. </p> <pre><code>extern "C" { void uglyNameError(char const *str) { /* ... */ } /* ... */ } a.error = &uglyNameError; </code></pre> <p>I wondered whether it could be possible by merely giving the function type C linkage</p> <pre><code>extern "C" void fty(char const *str); namespace { fty error; /* Declared! But i can i define it with that type!? */ } </code></pre> <p>Any ideas? I'm looking for Standard-C++ solutions. </p>

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