--- ProjectQ-0.5.1/projectq/backends/_sim/_cppkernels/simulator.hpp	2020-06-05 21:07:57.000000000 +0800
+++ ProjectQ-0.5.1_new/projectq/backends/_sim/_cppkernels/simulator.hpp	2021-01-14 10:52:24.822039389 +0800
@@ -33,7 +33,6 @@
 #include <random>
 #include <functional>
 
-
 class Simulator{
 public:
     using calc_type = double;
@@ -44,8 +43,9 @@ public:
     using Term = std::vector<std::pair<unsigned, char>>;
     using TermsDict = std::vector<std::pair<Term, calc_type>>;
     using ComplexTermsDict = std::vector<std::pair<Term, complex_type>>;
+    StateVector vec_;
 
-    Simulator(unsigned seed = 1) : N_(0), vec_(1,0.), fusion_qubits_min_(4),
+    Simulator(unsigned seed = 1) : vec_(1,0.), N_(0), fusion_qubits_min_(4),
                                    fusion_qubits_max_(5), rnd_eng_(seed) {
         vec_[0]=1.; // all-zero initial state
         std::uniform_real_distribution<double> dist(0., 1.);
@@ -562,7 +562,6 @@ private:
     }
 
     unsigned N_; // #qubits
-    StateVector vec_;
     Map map_;
     Fusion fused_gates_;
     unsigned fusion_qubits_min_, fusion_qubits_max_;
@@ -570,10 +569,8 @@ private:
     std::function<double()> rng_;
 
     // large array buffers to avoid costly reallocations
-    static StateVector tmpBuff1_, tmpBuff2_;
+    StateVector tmpBuff1_, tmpBuff2_;
 };
 
-Simulator::StateVector Simulator::tmpBuff1_;
-Simulator::StateVector Simulator::tmpBuff2_;
 
 #endif