Re: [Boost-users] Using Boost::Bind

I should clarify, this is what I want to achieve: boost::function singleHandler; void addHandler(boost::function newHandler) { singleHandler = newHandler; } The problem is that I don't know how to call boost::bind with a DBuffer parameter, where DBuffer is one of my own classes.

You will want to learn a bit more about Boost.Bind. You can bind your pointer or variable at the bind call. Parameters at the time of bind are copied by value. If you need a reference use the boost::ref wrapper.

Expanding your example:

void DClient::resolveHandler( const boost::system::error_code& error, int value ); ... int special_number = 42;

hostResolver->async_resolve( *nameQuery, boost::bind(&DClient::resolveHandler, this, boost::asio::placeholders::error, special_number ) );

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In the above, when the handler is invoked it will pass the error value (via the placeholder) and the value of special_number during the bind... which is 42.

If I understand you correctly, then in the following code: void DClient::resolveHandler(int param) { .... } boost::function functionPtr; int tempInt = 12; myHandler = boost::bind(&DClient::resolveHandler, this, tempInt); myHandler(67); The final line will call resolveHandler with a parameter of 12, rather than 67? Surely that can't be right?