Added user provided seed to CFullStateSinulator (#780)

src/Qir/Runtime/lib/Simulators/FullstateSimulator.cpp

@@ -10,6 +10,8 @@
 #include <vector>
 #include <fstream>
 #include <climits>
+#include <chrono>
+#include <cstdint>
 
 #pragma clang diagnostic push
     // Ignore warnings for reserved macro names `_In_`, `_In_reads_(n)`:
@@ -159,7 +161,7 @@ namespace Quantum
         }
 
       public:
-        CFullstateSimulator()
+        CFullstateSimulator(uint32_t userProvidedSeed = 0)
             : handle(LoadQuantumSimulator())
         {
             typedef unsigned (*TInit)();
@@ -167,6 +169,13 @@ namespace Quantum
 
             qubitManager = std::make_unique<CQubitManager>();
             this->simulatorId = initSimulatorInstance();
+
+            typedef void (*TSeed)(unsigned, unsigned);
+            static TSeed setSimulatorSeed = reinterpret_cast<TSeed>(this->GetProc("seed"));
+            setSimulatorSeed(this->simulatorId, 
+                             (userProvidedSeed == 0) 
+                                ? (unsigned)std::chrono::system_clock::now().time_since_epoch().count()
+                                : (unsigned)userProvidedSeed);
         }
         ~CFullstateSimulator() override
         {
@@ -540,9 +549,9 @@ namespace Quantum
         DumpRegisterImpl(outStream, qubits);
     }
 
-    std::unique_ptr<IRuntimeDriver> CreateFullstateSimulator()
+    std::unique_ptr<IRuntimeDriver> CreateFullstateSimulator(uint32_t userProvidedSeed /*= 0*/)
     {
-        return std::make_unique<CFullstateSimulator>();
+        return std::make_unique<CFullstateSimulator>(userProvidedSeed);
     }
 } // namespace Quantum
 } // namespace Microsoft

src/Qir/Runtime/public/SimFactory.hpp

@@ -5,6 +5,7 @@
 
 #include <memory>
 #include <vector>
+#include <cstdint>
 
 #include "QirRuntimeApi_I.hpp"
 
@@ -16,7 +17,7 @@ namespace Quantum
     QIR_SHARED_API std::unique_ptr<IRuntimeDriver> CreateToffoliSimulator();
 
     // Full State Simulator
-    QIR_SHARED_API std::unique_ptr<IRuntimeDriver> CreateFullstateSimulator();
+    QIR_SHARED_API std::unique_ptr<IRuntimeDriver> CreateFullstateSimulator(uint32_t userProvidedSeed = 0);
 
 } // namespace Quantum
 } // namespace Microsoft