added DType class

core/include/aare/DType.hpp

@@ -0,0 +1,45 @@
+#pragma once
+#include <cstdint>
+#include <string>
+#include <typeinfo>
+
+namespace aare {
+
+enum class endian
+{
+#ifdef _WIN32
+    little = 0,
+    big    = 1,
+    native = little
+#else
+    little = __ORDER_LITTLE_ENDIAN__,
+    big    = __ORDER_BIG_ENDIAN__,
+    native = __BYTE_ORDER__
+#endif
+};
+
+class DType {
+    static_assert(sizeof(long)==sizeof(int64_t), "long should be 64bits");
+  public:
+    enum  TypeIndex { INT8, UINT8, INT16, UINT16, INT32, UINT32, INT64, UINT64, FLOAT, DOUBLE, ERROR };
+    
+    explicit DType(const std::type_info &t);
+    explicit DType(std::string_view sv);
+    //not explicit to allow conversions form enum to DType
+    DType(DType::TypeIndex ti); 
+
+    bool operator==(const DType &other) const noexcept;
+    bool operator!=(const DType &other) const noexcept;
+    bool operator==(const std::type_info &t) const;
+    bool operator!=(const std::type_info &t) const;
+    // bool operator==(DType::TypeIndex ti) const;
+    // bool operator!=(DType::TypeIndex ti) const;
+    std::string str() const;
+
+  
+  private:
+    TypeIndex m_type{TypeIndex::ERROR};
+
+};
+
+} // namespace aare