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<h1 id="design-adapter-pattern"><a class="header" href="adapter_pattern.html#design-adapter-pattern">design adapter pattern</a></h1>
<pre><code class="language-c++">
#include <iostream>
#include <memory>
#include <vector>
#include <string>
#include <stdexcept>
#include <functional>
// Legacy Interface (Existing System)
class LegacyRectangle {
public:
void oldDrawMethod(int x1, int y1, int x2, int y2) {
std::cout << "Legacy Rectangle drawn from ("
<< x1 << "," << y1 << ") to ("
<< x2 << "," << y2 << ")" << std::endl;
}
};
// Target Interface (New System)
class Shape {
public:
virtual void draw() = 0;
virtual void resize(double factor) = 0;
virtual ~Shape() = default;
};
// Object Adapter (Composition-based)
class RectangleAdapter : public Shape {
public:
RectangleAdapter(int x, int y, int width, int height)
: x(x), y(y), width(width), height(height),
legacyRectangle(std::make_unique<LegacyRectangle>()) {}
void draw() override {
// Adapt legacy drawing method to new interface
legacyRectangle->oldDrawMethod(x, y, x + width, y + height);
}
void resize(double factor) override {
width = static_cast<int>(width * factor);
height = static_cast<int>(height * factor);
}
private:
int x, y, width, height;
std::unique_ptr<LegacyRectangle> legacyRectangle;
};
// Class Adapter (Inheritance-based)
class ClassRectangleAdapter :
public Shape,
private LegacyRectangle {
public:
ClassRectangleAdapter(int x, int y, int width, int height)
: x(x), y(y), width(width), height(height) {}
void draw() override {
// Adapt legacy method using inheritance
oldDrawMethod(x, y, x + width, y + height);
}
void resize(double factor) override {
width = static_cast<int>(width * factor);
height = static_cast<int>(height * factor);
}
private:
int x, y, width, height;
};
// Functional Adapter (Modern C++ Approach)
class FunctionalAdapter {
public:
// Adapter that can wrap any callable with different signature
template<typename Callable, typename... Args>
class Adapter {
public:
Adapter(Callable callable) : callable(callable) {}
auto operator()(Args... args) {
// Potential transformation of arguments or return value
return callable(std::forward<Args>(args)...);
}
private:
Callable callable;
};
// Factory method to create adapters
template<typename Callable, typename... Args>
static auto adapt(Callable callable) {
return Adapter<Callable, Args...>(callable);
}
};
// Interface Adapter with Type Erasure
class DrawingTool {
public:
virtual void renderShape() = 0;
virtual ~DrawingTool() = default;
};
class TypeErasedAdapter {
public:
template<typename T>
class Adaptor : public DrawingTool {
public:
Adaptor(T shape) : shape(std::move(shape)) {}
void renderShape() override {
shape.draw();
}
private:
T shape;
};
// Factory method for type-erased adaptation
template<typename T>
static std::unique_ptr<DrawingTool> adapt(T shape) {
return std::make_unique<Adaptor<T>>(std::move(shape));
}
};
// Advanced Multiple Interface Adapter
class MultiInterfaceAdapter {
public:
// Adaptee with different interface
class DataProcessor {
public:
void processData(const std::vector<int>& data) {
std::cout << "Processing data: ";
for (int val : data) {
std::cout << val << " ";
}
std::cout << std::endl;
}
};
// Adapter supporting multiple interfaces
class Adapter {
public:
void processIntData(const std::vector<int>& data) {
processor.processData(data);
}
void processStringData(const std::vector<std::string>& data) {
std::vector<int> convertedData;
for (const auto& str : data) {
try {
convertedData.push_back(std::stoi(str));
} catch(...) {
// Ignore conversion errors
}
}
processor.processData(convertedData);
}
private:
DataProcessor processor;
};
};
int main() {
// Object Adapter Demonstration
{
std::unique_ptr<Shape> rectangle =
std::make_unique<RectangleAdapter>(10, 20, 100, 50);
std::cout << "Object Adapter:" << std::endl;
rectangle->draw();
rectangle->resize(2.0);
rectangle->draw();
}
// Class Adapter Demonstration
{
std::unique_ptr<Shape> classRectangle =
std::make_unique<ClassRectangleAdapter>(30, 40, 200, 100);
std::cout << "\nClass Adapter:" << std::endl;
classRectangle->draw();
classRectangle->resize(0.5);
classRectangle->draw();
}
// Functional Adapter Demonstration
{
std::cout << "\nFunctional Adapter:" << std::endl;
auto adaptedFunc = FunctionalAdapter::adapt<
std::function<int(int, int)>
>([](int a, int b) { return a + b; });
std::cout << "Adapted function result: "
<< adaptedFunc(5, 3) << std::endl;
}
// Type Erased Adapter Demonstration
{
std::cout << "\nType Erased Adapter:" << std::endl;
auto drawingTool = TypeErasedAdapter::adapt(
RectangleAdapter(50, 60, 150, 75)
);
drawingTool->renderShape();
}
// Multiple Interface Adapter
{
std::cout << "\nMultiple Interface Adapter:" << std::endl;
MultiInterfaceAdapter::Adapter adapter;
// Process integer data
std::vector<int> intData = {1, 2, 3, 4, 5};
adapter.processIntData(intData);
// Process string data
std::vector<std::string> stringData = {"10", "20", "30"};
adapter.processStringData(stringData);
}
return 0;
}
</code></pre>
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