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rEFIt_UEFI/cpp_lib/undefinable.h

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+/*
+ * def_types.h
+ *
+ *  Created on: Mar 19, 2021
+ *      Author: jief
+ */
+
+#ifndef CPP_LIB_DEF_TYPES_H_
+#define CPP_LIB_DEF_TYPES_H_
+
+template <class T>
+class undefinable
+{
+protected:
+  bool m_defined = false;
+  T m_value = false;
+
+public:
+  bool isDefined() const { return m_defined; }
+  void setDefined(bool b) { m_defined = b; }
+  
+  operator T() const {
+    if ( !isDefined() ) panic("def_type is not defined");
+    return m_value;
+  }
+  undefinable<T>& operator = (T value) {
+    setDefined(true);
+    m_value = value;
+    return *this;
+  }
+};
+
+class undefinable_bool : public undefinable<bool>
+{
+  using super = undefinable<bool>;
+public:
+    undefinable_bool& operator = (bool b) { super::operator=(b); return *this; }
+};
+
+class undefinable_uint16 : public undefinable<uint16_t>
+{
+  using super = undefinable<uint16_t>;
+public:
+    undefinable_uint16& operator = (uint16_t b) { super::operator=(b); return *this; }
+};
+
+class undefinable_uint32 : public undefinable<uint32_t>
+{
+  using super = undefinable<uint32_t>;
+public:
+    undefinable_uint32& operator = (uint32_t b) { super::operator=(b); return *this; }
+};
+
+
+
+#endif /* CPP_LIB_DEF_TYPES_H_ */