Basic C++ worker implementation (#6125)

cpp/src/example/example.cc

@@ -0,0 +1,76 @@
+
+/// This is a complete example of writing a distributed program using the C ++ worker API.
+
+/// including the header
+#include <ray/api.h>
+
+/// using namespace
+using namespace ray::api;
+
+/// general function of user code
+int Return1() { return 1; }
+int Plus1(int x) { return x + 1; }
+int Plus(int x, int y) { return x + y; }
+
+/// a class of user code
+class Counter {
+ public:
+  int count;
+
+  Counter() { count = 0; }
+
+  static Counter *FactoryCreate() { return new Counter(); }
+  /// non static function
+  int Add(int x) {
+    count += x;
+    return count;
+  }
+};
+
+int main() {
+  /// initialization
+  Ray::Init();
+
+  /// put and get object
+  auto obj = Ray::Put(123);
+  auto getRsult = obj.Get();
+
+  /// general function remote call（args passed by value）
+  auto r0 = Ray::Call(Return1);
+  auto r1 = Ray::Call(Plus1, 1);
+  auto r2 = Ray::Call(Plus, 1, 2);
+
+  int result0 = *(r0.Get());
+  int result1 = *(r1.Get());
+  int result2 = *(r2.Get());
+
+  std::cout << "Ray::call with value results: " << result0 << " " << result1 << " "
+            << result2 << std::endl;
+
+  /// general function remote call（args passed by reference）
+  auto r3 = Ray::Call(Return1);
+  auto r4 = Ray::Call(Plus1, r3);
+  auto r5 = Ray::Call(Plus, r4, 1);
+
+  int result3 = *(r3.Get());
+  int result4 = *(r4.Get());
+  int result5 = *(r5.Get());
+
+  std::cout << "Ray::call with reference results: " << result3 << " " << result4 << " "
+            << result5 << std::endl;
+
+  /// create actor and actor function remote call
+  RayActor<Counter> actor = Ray::CreateActor(Counter::FactoryCreate);
+  auto r6 = actor.Call(&Counter::Add, 5);
+  auto r7 = actor.Call(&Counter::Add, 1);
+  auto r8 = actor.Call(&Counter::Add, 1);
+  auto r9 = actor.Call(&Counter::Add, r8);
+
+  int result6 = *(r6.Get());
+  int result7 = *(r7.Get());
+  int result8 = *(r8.Get());
+  int result9 = *(r9.Get());
+
+  std::cout << "Ray::call with actor results: " << result6 << " " << result7 << " "
+            << result8 << " " << result9 << std::endl;
+}