t00018 - Pimpl pattern

Config

diagrams:
  t00018_class:
    type: class
    glob:
      - "*.cc"
    using_namespace: clanguml::t00018
    include:
      namespaces:
        - clanguml::t00018

Source code

File tests/t00018/t00018.h

#pragma once
 
#ifndef _MSC_VER
#include <experimental/propagate_const>
#endif
#include <iostream>
#include <memory>
 
namespace clanguml {
namespace t00018 {
 
namespace impl {
class widget;
}
 
// Pimpl example based on https://en.cppreference.com/w/cpp/language/pimpl
class widget {
    std::unique_ptr<impl::widget> pImpl;
 
public:
    void draw() const;
    void draw();
    bool shown() const { return true; }
    widget(int);
    ~widget();
 
    widget(widget &&);
 
    widget(const widget &) = delete;
    widget &operator=(widget &&);
    widget &operator=(const widget &) = delete;
};
}
}

File tests/t00018/t00018_impl.h

#pragma once
 
#include "t00018.h"
 
namespace clanguml {
namespace t00018 {
namespace impl {
 
class widget {
    int n;
 
public:
    void draw(const clanguml::t00018::widget &w) const;
    void draw(const clanguml::t00018::widget &w);
    widget(int n);
};
}
}
}

File tests/t00018/t00018.cc

#include "t00018.h"
#include "t00018_impl.h"
 
namespace clanguml {
namespace t00018 {
 
void widget::draw() const { pImpl->draw(*this); }
 
void widget::draw() { pImpl->draw(*this); }
 
widget::widget(int n)
    : pImpl{std::make_unique<impl::widget>(n)}
{
}
 
widget::widget(widget &&) = default;
 
widget::~widget() = default;
 
widget &widget::operator=(widget &&) = default;
} // namespace t00018
} // namespace clanguml

File tests/t00018/t00018_impl.cc

#include "t00018_impl.h"
#include "t00018.h"
 
namespace clanguml {
namespace t00018 {
namespace impl {
 
widget::widget(int n)
    : n(n)
{
}
 
void widget::draw(const clanguml::t00018::widget &w) const
{
    if (w.shown())
        std::cout << "drawing a const widget " << n << '\n';
}
 
void widget::draw(const clanguml::t00018::widget &w)
{
    if (w.shown())
        std::cout << "drawing a non-const widget " << n << '\n';
}
} // namespace impl
} // namespace t00018
} // namespace clanguml

Generated PlantUML diagrams

Generated Mermaid diagrams

Generated JSON models

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      "id": "1044021117462303949",
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      "is_union": false,
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          "source_location": {
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            "file": "t00018_impl.h",
            "line": 10,
            "translation_unit": "t00018.cc"
          },
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        }
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            "line": 13,
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          },
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      },
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    {
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            "line": 18,
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          },
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        }
      ],
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      },
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  ],
  "name": "t00018_class",
  "package_type": "namespace",
  "relationships": [
    {
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      "destination": "8045290274990832704",
      "source": "1044021117462303949",
      "type": "dependency"
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    {
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      "label": "pImpl",
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      "type": "aggregation"
    }
  ],
  "using_namespace": "clanguml::t00018"
}