Qrack plugin: fixing init param key, fixing 'pragma once', removing unused CMake Eigen includes

Signed-off-by: WrathfulSpatula <stranoj@gmail.com>

quantum/plugins/qrack/CMakeLists.txt

@@ -12,8 +12,7 @@ add_library(${LIBRARY_NAME} SHARED ${SRC})
 target_include_directories(${LIBRARY_NAME}
                              PUBLIC .
                                     ./accelerator
-                                    ./accelerator/src/include
-                                    ${CMAKE_SOURCE_DIR}/tpls/eigen)
+                                    ./accelerator/src/include)
 
 find_package(OpenCL)
 if (OpenCL_FOUND)

quantum/plugins/qrack/accelerator/QrackAccelerator.cpp

@@ -26,13 +26,13 @@ namespace quantum {
             m_shots = params.get<int>("shots");
             if (m_shots < 1)
             {
-                xacc::error("Invalid 'shots' parameter.");
+                xacc::error("Invalid 'shots' parameter. (Must be >= 1.)");
             }
         }
 
         if (params.keyExists<bool>("use_opencl"))
         {
-            m_use_opencl = params.get<bool>("shots");
+            m_use_opencl = params.get<bool>("use_opencl");
         }
 
         if (params.keyExists<bool>("use_qunit"))
@@ -53,6 +53,10 @@ namespace quantum {
         if (params.keyExists<double>("zero_threshold"))
         {
             m_zero_threshold = params.get<double>("zero_threshold");
+            if (m_zero_threshold < 0)
+            {
+                xacc::error("Invalid 'zero_threshold' parameter. (Must be >= 0.)");
+            }
         }
     }
 

quantum/plugins/qrack/accelerator/QrackAccelerator.hpp

@@ -11,7 +11,7 @@
  *   Thien Nguyen - initial API and implementation
  *   Daniel Strano - adaption from Quantum++ to Qrack
  *******************************************************************************/
-#pragma one
+#pragma once
 #include "xacc.hpp"
 #include "QrackVisitor.hpp"
 

quantum/plugins/qrack/accelerator/QrackVisitor.hpp

@@ -12,7 +12,7 @@
  *   Daniel Strano - adaption from Quantum++ to Qrack
  *******************************************************************************/
 
-#pragma one
+#pragma once
 #include "Identifiable.hpp"
 #include "AllGateVisitor.hpp"
 #include "AcceleratorBuffer.hpp"