types and value descriptors

src/values/descriptors.hpp

+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "values/types.hpp"
+
+namespace ngraph {
+
+class ValueDescriptor
+{
+public:
+    virtual std::shared_ptr<ValueType> value_type() const = 0;
+};
+
+class TensorDescriptor
+{
+protected:
+    ElementType element_type;
+};
+
+class TensorLayoutDescriptor
+{
+
+};
+
+class TensorViewDescriptor : public ValueDescriptor
+{
+public:
+    std::shared_ptr<ValueType> value_type() const override {
+        return m_type;
+    }
+protected:
+    std::shared_ptr<TensorViewType> m_type;
+    TensorDescriptor m_tensor_descriptor;
+    TensorLayoutDescriptor m_tensor_layout_descriptor;
+};
+
+class TupleDescriptor : public ValueDescriptor
+{
+public:
+    std::shared_ptr<ValueType> value_type() const override {
+        return m_type;
+    }
+protected:
+    std::shared_ptr<TupleType> m_type;
+    std::vector<ValueDescriptor> m_element_descriptors;
+};
+
+} // End of NGRAPH

src/values/types.hpp

+#pragma once
+
+#include <memory>
+#include <vector>
+
+#include "element_type.hpp"
+
+namespace ngraph {
+
+using value_size_t = size_t;
+
+// Base type for ngraph values
+class ValueType
+{
+
+};
+
+class TensorViewType : public ValueType
+{
+protected:
+    ElementType m_element_type;
+    std::vector<value_size_t> m_shape;
+};
+
+class TupleType : public ValueType
+{
+protected:
+    // Is this name too similar to TensorViewType.to m_element_type?
+    std::vector<ValueType> m_element_types;
+};
+
+} // End of ngraph
\ No newline at end of file

test/CMakeLists.txt

@@ -22,6 +22,7 @@ include_directories(
 
 set (SRC
     main.cpp
+    build_graph.cpp
     util.cpp
     tensor.cpp
     exop.cpp

test/build_graph.cpp

+#include "values/descriptors.hpp"
+
+using namespace std;
+using namespace ngraph;
+
+void build_simple_graph()
+{
+}
\ No newline at end of file

test/main.cpp

@@ -19,7 +19,7 @@
 
 using namespace std;
 
-extern "C" int main(int argc, char** argv)
+int main(int argc, char** argv)
 {
     const char*   exclude = "--gtest_filter=-benchmark.*";
     vector<char*> argv_vector;