Refactoring Tensor

Adding context to Tensor
Adding "active area" to Tensor
Forward declaring TensorImpl in Tensor instead of the another way around
CPU storage is unsigned char instead of void *
todo: memory location for device different than CPU
todo: a Tensor can share a TensorImpl with another Tensor
TensorImpl = storage
Tensor = view on storage

Notes:

• Tensor::getImpl() returns a reference not a pointer, thus client code must replace getImpl()-> by getImpl().
• Tensor.hpp does not includes backend\TensorImpl.hpp but backend\TensorImpl.hpp includes Tensor.hpp. Thus client code needs to include backend\TensorImpl.hpp (with or without Tensor.hpp)

unit_tests/CMakeLists.txt

@@ -8,19 +8,20 @@ FetchContent_Declare(
 
 FetchContent_MakeAvailable(Catch2)
 
-#file(GLOB_RECURSE src_files "*.cpp")
-set(src_files)
-list(APPEND src_files "data/Test_Context.cpp")
-list(APPEND src_files "graph/Test_Connector.cpp")
-list(APPEND src_files "graph/Test_GraphView.cpp")
-#MESSAGE(WARNING "Memory leak in graphMatching/Test_GRegex.cpp")
-list(APPEND src_files "graphMatching/Test_GRegex.cpp")
-list(APPEND src_files "graphMatching/Test_NodeRegex.cpp")
-#MESSAGE(WARNING "Memory leak in graphMatching/Test_SeqStm.cpp")
-list(APPEND src_files "graphMatching/Test_SeqStm.cpp")
-#MESSAGE(WARNING "Memory leak in graphMatching/Test_StmFactory.cpp")
-list(APPEND src_files "graphMatching/Test_StmFactory.cpp")
-list(APPEND src_files "operator/Test_GenericOperator.cpp")
+# Comment following line and uncomment the next ones to selectively activate tests
+file(GLOB_RECURSE src_files "*.cpp")
+# set(src_files)
+# list(APPEND src_files "data/Test_Context.cpp")
+# list(APPEND src_files "graph/Test_Connector.cpp")
+# list(APPEND src_files "graph/Test_GraphView.cpp")
+# #MESSAGE(WARNING "Memory leak in graphMatching/Test_GRegex.cpp")
+# list(APPEND src_files "graphMatching/Test_GRegex.cpp")
+# list(APPEND src_files "graphMatching/Test_NodeRegex.cpp")
+# #MESSAGE(WARNING "Memory leak in graphMatching/Test_SeqStm.cpp")
+# list(APPEND src_files "graphMatching/Test_SeqStm.cpp")
+# #MESSAGE(WARNING "Memory leak in graphMatching/Test_StmFactory.cpp")
+# list(APPEND src_files "graphMatching/Test_StmFactory.cpp")
+# list(APPEND src_files "operator/Test_GenericOperator.cpp")
 
 add_executable(tests${module_name} ${src_files})