AMDG Carlos wrote:

I am trying to make a wrapper for libxml's SAX api, for learning purpose, I am trying to use bind to wrap sax events in a class like this :

namespace sax { class document {

public: document(); ~document();

protected:

virtual void start_node( void *user_data, const xmlChar *name, const xmlChar **attrs );

xmlSAXHandler m_evhdl; xmlParserCtxtPtr m_ctxt; }; }

The start_node() function is intended to be pointed by the startElement member from xmlSAXHandler ( it has same definition than start_node ).

I tried to use bind to copy function pointer in the constructor like this :

document::document() {

// binding here m_evhdl.startElement = boost::bind( &document::start_node, this, _1, _2, _3 );

// xml init m_ctxt = xmlCreateFileParserCtxt( "catalogue.xml" );

m_ctxt->sax = &m_evhdl; xmlParseDocument( m_ctxt ); }

The issue is that I can't submit the binded function to startElement because bind submits "this" as a parameter to startElement, which is incompatible definition, so is there a solution to my binding ?

I don't know much about libxml, but it looks like you should pass the this pointer in the user_data argument of start_node. Something like this: class document { // ... static void start_node_func(void* user_data, const xmlChar* name, const xmlChar** attrs) { static_cast(user_data)->start_node(name, attrs); } }; In Christ, Steven Watanabe