# t20017 - Test case for combine_free_functions_into_file_participants option
## Config
```yaml
compilation_database_dir: ..
output_directory: puml
diagrams:
  t20017_sequence:
    type: sequence
    combine_free_functions_into_file_participants: true
    relative_to: ../../tests/t20017
    glob:
      - ../../tests/t20017/t20017.cc
    include:
      namespaces:
        - clanguml::t20017
      paths:
        - .
    using_namespace:
      - clanguml::t20017
    start_from:
      - function: "clanguml::t20017::tmain()"
```
## Source code
File t20017_b.cc
```cpp
#include "include/t20017_b.h"

namespace clanguml {
namespace t20017 {
int b1(int x, int y) { return x - y; }
}
}
```
File t20017.cc
```cpp
#include "include/t20017_a.h"
#include "include/t20017_b.h"

namespace clanguml {
namespace t20017 {
int tmain() { return b2(a1(a2(a3(1, 2), b1(3, 4)), 5), 6); }
}
}
```
## Generated UML diagrams
![t20017_sequence](./t20017_sequence.svg "Test case for combine_free_functions_into_file_participants option")