Added layer cake patter

docs/test_cases.md

@@ -17,6 +17,7 @@
  * [t00016](./test_cases/t00016.md) - Unnamed enums and empty templates
  * [t00017](./test_cases/t00017.md) - Test include relations also as members flag
  * [t00018](./test_cases/t00018.md) - Pimpl pattern
+ * [t00019](./test_cases/t00019.md) - Layercake pattern
 ## Sequence diagrams
  * [t20001](./test_cases/t20001.md) - Basic sequence diagram
 ## Configuration diagrams

docs/test_cases/t00019.md

@@ -0,0 +1,160 @@
+# t00019 - Layercake pattern
+## Config
+```yaml
+compilation_database_dir: ..
+output_directory: puml
+diagrams:
+  t00019_class:
+    type: class
+    glob:
+      - ../../tests/t00019/**.h
+      - ../../tests/t00019/**.cc
+    using_namespace:
+      - clanguml::t00019
+    include:
+      namespaces:
+        - clanguml::t00019
+    plantuml:
+      after:
+        - '@A(Base) <|-- @A(Layer3<LowerLayer>)'
+        - '@A(Layer3<LowerLayer>) <|-- @A(Layer2<LowerLayer>)'
+        - '@A(Layer2<LowerLayer>) <|-- @A(Layer1<LowerLayer>)'
+
+```
+## Source code
+File t00019_layer2.h
+```cpp
+#pragma once
+
+namespace clanguml {
+namespace t00019 {
+
+template <typename LowerLayer> class Layer2 : public LowerLayer {
+
+    using LowerLayer::LowerLayer;
+
+    using LowerLayer::m1;
+
+    using LowerLayer::m2;
+
+    int all_calls_count() const
+    {
+        return LowerLayer::m1_calls() + LowerLayer::m2_calls();
+    }
+};
+}
+}
+
+```
+File t00019_base.h
+```cpp
+#pragma once
+
+#include <string>
+
+namespace clanguml {
+namespace t00019 {
+
+class Base {
+
+    Base() = default;
+
+    virtual ~Base() = default;
+
+    virtual int m1() { return 2; }
+
+    virtual std::string m2() { return "two"; }
+};
+}
+}
+
+```
+File t00019_layer1.h
+```cpp
+#pragma once
+
+#include <string>
+#include <iostream>
+
+namespace clanguml {
+namespace t00019 {
+
+template <typename LowerLayer> class Layer1 : public LowerLayer {
+
+    using LowerLayer::LowerLayer;
+
+    int m1() override
+    {
+        std::cout << "m1 called\n";
+        return LowerLayer::m1();
+    }
+
+    std::string m2() override
+    {
+        std::cout << "m2 called\n";
+        return LowerLayer::m2();
+    }
+};
+}
+}
+
+```
+File t00019.cc
+```cpp
+#include "t00019_base.h"
+#include "t00019_layer1.h"
+#include "t00019_layer2.h"
+#include "t00019_layer3.h"
+
+#include <memory>
+
+namespace clanguml {
+namespace t00019 {
+
+class A {
+public:
+    std::unique_ptr<Layer1<Layer2<Layer3<Base>>>> layers;
+};
+}
+}
+
+```
+File t00019_layer3.h
+```cpp
+#pragma once
+
+#include <string>
+
+namespace clanguml {
+namespace t00019 {
+
+template <typename LowerLayer> class Layer3 : public LowerLayer {
+
+    using LowerLayer::LowerLayer;
+
+    virtual int m1() override
+    {
+        m_m1_calls++;
+        return LowerLayer::m1();
+    }
+
+    virtual std::string m2() override
+    {
+        m_m2_calls++;
+        return LowerLayer::m2();
+    }
+
+    int m1_calls() const { return m_m1_calls; }
+
+    int m2_calls() const { return m_m2_calls; }
+
+private:
+    int m_m1_calls{};
+    int m_m2_calls{};
+};
+}
+}
+
+```
+## Generated UML diagrams
+![t00019_class](./t00019_class.png "Layercake pattern")