# t20018 - Recursive template sequence diagram test case
## Config
```yaml
compilation_database_dir: ..
output_directory: puml
diagrams:
  t20018_sequence:
    type: sequence
    glob:
      - ../../tests/t20018/t20018.cc
    include:
      namespaces:
        - clanguml::t20018
    using_namespace:
      - clanguml::t20018
    start_from:
      - function: "clanguml::t20018::tmain()"
```
## Source code
File t20018.cc
```cpp
#include <iostream>

namespace clanguml {
namespace t20018 {

template <int N> struct Factorial {
    static const int value = N * Factorial<N - 1>::value;

    static void print(int answer) { Factorial<N - 1>::print(answer); }
};

template <> struct Factorial<0> {
    static const int value = 1;

    static void print(int answer)
    {
        std::cout << "The answer is " << answer << "\n";
    }
};

template <typename T, int N = T::value> struct Answer {
    static void print() { T::print(N); }
};

void tmain() { Answer<Factorial<5>>::print(); }
}
}
```
## Generated UML diagrams
![t20018_sequence](./t20018_sequence.svg "Recursive template sequence diagram test case")