# t00098 - Test case for decorator design pattern using static polymorphism
## Config
```yaml
diagrams:
  t00098_class:
    type: class
    title: Decorator design pattern with templates and concepts
    glob:
      - t00098.cc
    using_namespace: clanguml::t00098
    include:
      namespaces:
        - clanguml::t00098
```
## Source code
File `tests/t00098/t00098.cc`
```cpp
#include <concepts>
#include <memory>
#include <string>

namespace clanguml {
namespace t00098 {

template <typename T>
concept Component = requires(const T &t) {
    { t.operation() } -> std::convertible_to<std::string>;
};

struct ConcreteComponent {
    std::string operation() const { return "ConcreteComponent"; }
};

template <Component Inner> class ConcreteDecoratorA {
    Inner inner_;

public:
    explicit ConcreteDecoratorA(Inner inner)
        : inner_(std::move(inner))
    {
    }

    std::string operation() const
    {
        return "ConcreteDecoratorA(" + inner_.operation() + ")";
    }

    std::string added_behavior() const { return "Added behavior A"; }
};

template <Component Inner> class ConcreteDecoratorB {
    Inner inner_;

public:
    explicit ConcreteDecoratorB(Inner inner)
        : inner_(std::move(inner))
    {
    }

    std::string operation() const
    {
        return "ConcreteDecoratorB(" + inner_.operation() + ")";
    }

    void additional_method() const { }
};

template <Component C> class Client {
    C component_;

public:
    explicit Client(C component)
        : component_(std::move(component))
    {
    }

    std::string execute() { return component_.operation(); }
};

using BAClient =
    Client<ConcreteDecoratorB<ConcreteDecoratorA<ConcreteComponent>>>;

struct R {
    BAClient client;
};

int main()
{
    R r{.client = Client{
            ConcreteDecoratorB{ConcreteDecoratorA{ConcreteComponent{}}}}};

    std::puts(r.client.execute().c_str());

    return 0;
}
} // namespace t00098
} // namespace clanguml
```
## Generated PlantUML diagrams
![t00098_class](./t00098_class.svg "Test case for decorator design pattern using static polymorphism")
## Generated Mermaid diagrams
![t00098_class](./t00098_class_mermaid.svg "Test case for decorator design pattern using static polymorphism")
## Generated JSON models
```json
{
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      "name": "Component",
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        "file": "t00098.cc",
        "line": 9,
        "translation_unit": "t00098.cc"
      },
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      ],
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    },
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  ],
  "title": "Decorator design pattern with templates and concepts",
  "using_namespace": "clanguml::t00098"
}
```
## Generated GraphML models
```xml
<?xml version="1.0"?>
<graphml xmlns="http://graphml.graphdrawing.org/xmlns" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://graphml.graphdrawing.org/xmlns http://graphml.graphdrawing.org/xmlns/1.0/graphml.xsd">
 <desc><![CDATA[Decorator design pattern with templates and concepts]]></desc>
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  </edge>
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   <data key="ed2">Inner</data>
  </edge>
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   <data key="ed0">constraint</data>
   <data key="ed2">C</data>
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   <data key="ed0">dependency</data>
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   <data key="ed0">instantiation</data>
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  <edge id="e9" source="n8" target="n7">
   <data key="ed0">aggregation</data>
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  </edge>
 </graph>
</graphml>

```