A minimal example of a way to map std::chrono::system_clock::time_point with JavaCPP

NanoChrono.java

import org.bytedeco.javacpp.*;
import org.bytedeco.javacpp.annotation.*;

/**
 * java -jar /path/to/javacpp.jar NanoChrono.java
 * java -cp /path/to/javacpp.jar:. NanoChrono
 */
@Platform(include = "chrono")
public class NanoChrono {
    static { Loader.load(); }

    @Name("std::chrono::system_clock::time_point")
    public static class TimePoint extends Pointer {
        static { Loader.load(); }

        public TimePoint() { allocate(); }
        public TimePoint(Pointer p) { super(p); }
        private native void allocate();

        @ByVal @Namespace @Name("std::chrono::system_clock::now")
        public static native TimePoint now();

        @Name("time_since_epoch().count")
        public native long nano();
    }

    public static void main(String[] args) {
        long time1 = TimePoint.now().nano() / 1000000;
        long time2 = System.currentTimeMillis();
        System.out.println(time1);
        System.out.println(time2);
    }
}