Diff: ble/SafeBool.h

Revision:

1148:0340d5bbbeba

Parent:

948:1bb402105289

Child:

1149:c188d5238d62

--- a/ble/SafeBool.h	Wed Apr 06 19:14:15 2016 +0100
+++ b/ble/SafeBool.h	Wed Apr 06 19:14:16 2016 +0100
@@ -1,114 +1,114 @@
-/* mbed Microcontroller Library
- * Copyright (c) 2006-2013 ARM Limited
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef BLE_API_SAFE_BOOL_H_
-#define BLE_API_SAFE_BOOL_H_
-
-//safe bool idiom, see : http://www.artima.com/cppsource/safebool.html
-
-namespace SafeBool_ {
-/**
- * @brief Base class for all intances of SafeBool, 
- * This base class reduce instantiation of trueTag function
- */
-class base {
-  template<typename>
-  friend class SafeBool;
-
-protected:
-    //the bool type is a pointer to method which can be used in boolean context
-  typedef void (base::*BoolType_t)() const;
-
-  // non implemented call, use to disallow conversion between unrelated types 
-  void invalidTag() const;
-
-  // member function which indicate true value
-  void trueTag() const {}
-};
-
-
-}
-
-/**
- * @brief template class SafeBool use CRTP to made boolean conversion easy and correct.
- * Derived class should implement the function bool toBool() const to make this work. Inheritance 
- * should be public.
- *
- * @tparam T Type of the derived class
- * 
- * \code 
- * 
- * class A : public SafeBool<A> { 
- * public:
- * 
- *      // boolean conversion
- *      bool toBool() { 
- *      
- *      }  
- * };
- * 
- * class B : public SafeBool<B> { 
- * public:
- * 
- *      // boolean conversion
- *      bool toBool() const { 
- *      
- *      }  
- * };
- * 
- * A a;
- * B b;
- * 
- * // will compile 
- * if(a) { 
- * 
- * }
- * 
- * // compilation error 
- * if(a == b) { 
- * 
- * }
- * 
- * 
- * \endcode
- */
-template <typename T> 
-class SafeBool : public SafeBool_::base {
-public:
-  /** 
-   * bool operator implementation, derived class has to provide bool toBool() const function.
-   */
-  operator BoolType_t() const {
-    return (static_cast<const T*>(this))->toBool()
-      ? &SafeBool<T>::trueTag : 0;
-  }
-};
-
-//Avoid conversion to bool between different classes
-template <typename T, typename U>
-void operator==(const SafeBool<T>& lhs,const SafeBool<U>& rhs) {
-    lhs.invalidTag();
-//    return false;
-}
-
-//Avoid conversion to bool between different classes
-template <typename T,typename U>
-void operator!=(const SafeBool<T>& lhs,const SafeBool<U>& rhs) {
-  lhs.invalidTag();
-//  return false;
-}
-
+/* mbed Microcontroller Library
+ * Copyright (c) 2006-2013 ARM Limited
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLE_API_SAFE_BOOL_H_
+#define BLE_API_SAFE_BOOL_H_
+
+//safe bool idiom, see : http://www.artima.com/cppsource/safebool.html
+
+namespace SafeBool_ {
+/**
+ * @brief Base class for all intances of SafeBool,
+ * This base class reduce instantiation of trueTag function
+ */
+class base {
+  template<typename>
+  friend class SafeBool;
+
+protected:
+    //the bool type is a pointer to method which can be used in boolean context
+  typedef void (base::*BoolType_t)() const;
+
+  // non implemented call, use to disallow conversion between unrelated types
+  void invalidTag() const;
+
+  // member function which indicate true value
+  void trueTag() const {}
+};
+
+
+}
+
+/**
+ * @brief template class SafeBool use CRTP to made boolean conversion easy and correct.
+ * Derived class should implement the function bool toBool() const to make this work. Inheritance
+ * should be public.
+ *
+ * @tparam T Type of the derived class
+ *
+ * \code
+ *
+ * class A : public SafeBool<A> {
+ * public:
+ *
+ *      // boolean conversion
+ *      bool toBool() {
+ *
+ *      }
+ * };
+ *
+ * class B : public SafeBool<B> {
+ * public:
+ *
+ *      // boolean conversion
+ *      bool toBool() const {
+ *
+ *      }
+ * };
+ *
+ * A a;
+ * B b;
+ *
+ * // will compile
+ * if(a) {
+ *
+ * }
+ *
+ * // compilation error
+ * if(a == b) {
+ *
+ * }
+ *
+ *
+ * \endcode
+ */
+template <typename T>
+class SafeBool : public SafeBool_::base {
+public:
+  /**
+   * bool operator implementation, derived class has to provide bool toBool() const function.
+   */
+  operator BoolType_t() const {
+    return (static_cast<const T*>(this))->toBool()
+      ? &SafeBool<T>::trueTag : 0;
+  }
+};
+
+//Avoid conversion to bool between different classes
+template <typename T, typename U>
+void operator==(const SafeBool<T>& lhs,const SafeBool<U>& rhs) {
+    lhs.invalidTag();
+//    return false;
+}
+
+//Avoid conversion to bool between different classes
+template <typename T,typename U>
+void operator!=(const SafeBool<T>& lhs,const SafeBool<U>& rhs) {
+  lhs.invalidTag();
+//  return false;
+}
+
 #endif /* BLE_API_SAFE_BOOL_H_ */
\ No newline at end of file