摘自： http://pocoproject.org/docs/00100-GuidedTour.html
Active object is an object that has methods executing in their own thread. This makes asynchronous member function calls possible — call a member function, while the function executes, do a bunch of other things, and, eventually, obtain the function's return value. The following example shows how this is done in POCO. The ActiveAdder class in defines an active method add() , implemented by the addImpl() member function. Invoking the active method in main() yields an Poco::ActiveResult (also known as a future), that eventually receives the function's return value.
#include "Poco/ActiveMethod.h"#include "Poco/ActiveResult.h"#include <utility>using Poco::ActiveMethod;using Poco::ActiveResult;class ActiveAdder{public: ActiveObject(): activeAdd(this, &ActiveAdder::add) { } ActiveMethod<int, std::pair<int, int>, ActiveAdder> add;private: int addImpl(const std::pair<int, int>& args) { return args.first + args.second; }};int main(int argc, char** argv){ ActiveAdder adder; ActiveResult<int> sum = adder.add(std::make_pair(1, 2)); // do other things sum.wait(); std::cout << sum.data() << std::endl; return 0;}
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