gistfile1.cpp

class ConcurrentCounter {
	unsigned int* counters_;
	int length_;
public:
	ConcurrentCounter() {
		length_ = boost::thread::hardware_concurrency() * 0x100;
		counters_ = new unsigned int[length_];
		std::fill(counters_, counters_ + length_, 0);
	}
 
	unsigned int get_value() {
		return std::accumulate(counters_, counters_ + length_, 0);
	}
 
	void inc() {
		auto i = rand() % length_;
		InterlockedIncrement(counters_ + i);
	}
};