Add example of bridge pattern in C++

cpp/patterns/bridge/abstraction.hpp

@@ -0,0 +1,40 @@
+
+#ifndef ABSTRACTION_HPP
+#define ABSTRACTION_HPP
+
+#include <iostream>
+#include <utility>
+
+#include "implementation.hpp"
+
+// Abstract calculator that can only perform one operation
+class Calculator {
+public:
+  explicit Calculator(Implementation *method_) : method(method_) {}
+
+  virtual std::string getName() const = 0;
+  virtual int doMath(const int &a, const int &b) const = 0;
+
+protected:
+  Implementation *method;
+};
+
+// Simple calculator that can only perform one operation
+class SimpleCalculator : public Calculator {
+public:
+  explicit SimpleCalculator(Implementation *method_) : Calculator(method_) {}
+
+  inline std::string getName() const override { return method->getName();}
+  inline int doMath(const int &a, const int &b) const override { return method->math(a, b);}
+};
+
+// Verbose calculator that prints information on method performed and result
+class VerboseCalculator : public Calculator {
+public:
+  explicit VerboseCalculator(Implementation *method_) : Calculator(method_) {}
+
+  inline std::string getName() const override { return method->getName();}
+  int doMath(const int &a, const int &b) const override;
+};
+
+#endif // ABSTRACTION_HPP