Add example of bridge pattern in C++

cpp/patterns/bridge/main.cpp

@@ -0,0 +1,28 @@
+
+#include <array>
+#include <iostream>
+#include <vector>
+
+#include "abstraction.hpp"
+#include "implementation.hpp"
+
+int main(const int argc, const char * argv[]) {
+  Add *add = new Add;
+  SimpleCalculator adder(add);
+  const int a = 5;
+  const int b = 10;
+  std::cout << "A = " << a << "\nB = " << b << std::endl;
+
+  std::cout << "\nTesting " << adder.getName() << ".doMath(a, b)...\n";
+  std::cout << "Result: " << adder.doMath(a, b);
+
+  auto *sub = new Subtract;
+  SimpleCalculator subtractor(sub);
+  std::cout << "\n\nTesting " << subtractor.getName() << ".doMath(a, b)...\n";
+  std::cout << "Result: " << subtractor.doMath(a, b);
+
+  // Testing extension of abstraction
+  std::cout << "\n\nTesting VerboseCalculator.doMath(a, b)...\n";
+  VerboseCalculator verboseCalculator(add);
+  verboseCalculator.doMath(a, b);
+}