# t20022 - Forward class declaration sequence diagram test case
## Config
```yaml
compilation_database_dir: ..
output_directory: puml
diagrams:
  t20022_sequence:
    type: sequence
    glob:
      - ../../tests/t20022/t20022.cc
    include:
      namespaces:
        - clanguml::t20022
    using_namespace:
      - clanguml::t20022
    start_from:
      - function: "clanguml::t20022::tmain()"
```
## Source code
File t20022.cc
```cpp
#include <memory>

namespace clanguml {
namespace t20022 {
class B;

class A {
public:
    A(std::unique_ptr<B> b);

    void a();

    std::unique_ptr<B> b_;
};

class B {
public:
    void b() { }
};

A::A(std::unique_ptr<B> b)
    : b_{std::move(b)}
{
}

void A::a() { b_->b(); }

int tmain()
{
    A a{std::make_unique<B>()};

    a.a();

    return 0;
}
}
}
```
## Generated UML diagrams
![t20022_sequence](./t20022_sequence.svg "Forward class declaration sequence diagram test case")