I am trying to use Boost signals to set up events with VC6. I discovered that build 1.34.1 is the last build to support VC++ 6.0, so that is the version I need to compile with. I noticed from the Signals tutorial on the Boost site that for VC++ 6.0, I have to use the portable syntax. So I declared my signal: #include <boost\signals.hpp> #include <boost\signals\signal1.hpp> #include <vector> typedef boost::signal1<void, std::vector<unsigned char>> signal_t; I am using a vector of unsigned chars as a parameter to the signal handler (event handler), since I am essentially receiving data from an ethernet connection, parsing it, and sending it through the event back to the subscriber. Now the error. using the above code, I get the following error: error C2146: syntax error: missing ',' before identifier 'signal_t' I'm pretty sure I checked and double-checked the syntax several times, comparing it to the example in the signals tutorial. All I can think of is that a vector is not supported as a parameter, yet it was for version 1.46 that I tried earlier. Am I doing anything wrong? Quick responses are much appreciated! Thanks! Chris