making algorithm cloneable

Signed-off-by: Alex McCaskey <mccaskeyaj@ornl.gov>

quantum/plugins/algorithms/ml/ddcl/ddcl.cpp

@@ -209,6 +209,7 @@ DDCL::execute(const std::shared_ptr<AcceleratorBuffer> buffer,
   auto lossStrategy = xacc::getService<LossStrategy>(loss);
 
   // Execute!
+  std::cout << "RUNNING ON " << accelerator->name() << "\n";
   auto tmpBuffer = xacc::qalloc(buffer->size());
   accelerator->execute(tmpBuffer, circuits);
   auto buffers = tmpBuffer->getChildren();

quantum/plugins/algorithms/ml/ddcl/ddcl.hpp

@@ -78,6 +78,9 @@ public:
                const std::vector<double> &parameters) override;
   const std::string name() const override { return "ddcl"; }
   const std::string description() const override { return ""; }
+
+  DEFINE_ALGORITHM_CLONE(DDCL)
+
 };
 } // namespace algorithm
 } // namespace xacc

quantum/plugins/algorithms/ml/rbm_classification/rbm_classification.hpp

@@ -65,6 +65,7 @@ public:
   void execute(const std::shared_ptr<AcceleratorBuffer> buffer) const override;
   const std::string name() const override { return "rbm-classification"; }
   const std::string description() const override { return ""; }
+  DEFINE_ALGORITHM_CLONE(RBMClassification)
 };
 } // namespace algorithm
 } // namespace xacc

quantum/plugins/algorithms/rdm/rdm.hpp

@@ -31,6 +31,7 @@ public:
   void execute(const std::shared_ptr<AcceleratorBuffer> buffer) const override;
   const std::string name() const override { return "rdm"; }
   const std::string description() const override { return ""; }
+  DEFINE_ALGORITHM_CLONE(RDM)
 };
 } // namespace algorithm
 } // namespace xacc

quantum/plugins/algorithms/vqe-energy/vqe-energy.hpp

@@ -34,6 +34,8 @@ public:
 
   const std::string name() const override { return "vqe-energy"; }
   const std::string description() const override { return ""; }
+  DEFINE_ALGORITHM_CLONE(VQEEnergy)
+
 };
 } // namespace algorithm
 } // namespace xacc

quantum/plugins/algorithms/vqe/vqe.hpp

@@ -34,6 +34,7 @@ public:
   void execute(const std::shared_ptr<AcceleratorBuffer> buffer) const override;
   const std::string name() const override { return "vqe"; }
   const std::string description() const override { return ""; }
+  DEFINE_ALGORITHM_CLONE(VQE)
 };
 } // namespace algorithm
 } // namespace xacc

xacc/algorithm/Algorithm.hpp

@@ -31,7 +31,7 @@ namespace xacc {
 //
 // Algorithms expose an execute method that persists results
 // to the AcceleratorBuffer.
-class Algorithm : public xacc::Identifiable {
+class Algorithm : public xacc::Identifiable, public xacc::Cloneable<Algorithm> {
 
 public:
   bool initialize(const HeterogeneousMap &&parameters) {
@@ -42,7 +42,7 @@ public:
 
   virtual void
   execute(const std::shared_ptr<AcceleratorBuffer> buffer) const = 0;
-  
+
   virtual std::vector<double> execute(const std::shared_ptr<AcceleratorBuffer> buffer,
                        const std::vector<double> &parameters) {
     XACCLogger::instance()->error(
@@ -51,6 +51,11 @@ public:
     exit(0);
     return {};
   }
+
+ #define DEFINE_ALGORITHM_CLONE(CLASS)                    \
+  std::shared_ptr<Algorithm> clone() override { \
+    return std::make_shared<CLASS>();           \
+  }
 };
 
 } // namespace xacc

xacc/tests/AlgorithmTester.cpp

@@ -30,6 +30,7 @@ public:
   const std::vector<std::string> requiredParameters() const override {
     return {"observable"};
   }
+  DEFINE_ALGORITHM_CLONE(TestAlgorithm)
 
   void execute(const std::shared_ptr<AcceleratorBuffer> buffer) const override {
     return;