# t20042 - Test case for template overload pattern
## Config
```yaml
diagrams:
  t20042_sequence:
    type: sequence
    glob:
      - t20042.cc
    include:
      namespaces:
        - clanguml::t20042
    using_namespace: clanguml::t20042
    from:
      - function: "clanguml::t20042::tmain()"
```
## Source code
File `tests/t20042/t20042.cc`
```cpp
namespace clanguml {
namespace t20042 {
struct A { };
struct AHandler {
    void handle(A &a) const { }
    void operator()(A &a) const { handle(a); }
};

struct B { };
struct BHandler {
    void handle(B &b) const { }
    void operator()(B &b) const { handle(b); }
};

template <typename... Bases> struct Overload : public Bases... {
    using Bases::operator()...;
};
template <typename... Bases> Overload(Bases...) -> Overload<Bases...>;

void tmain()
{
    Overload<AHandler, BHandler> dispatch;
    A a;
    B b;

    dispatch(a);
    dispatch(b);
}
}
}
```
## Generated PlantUML diagrams
![t20042_sequence](./t20042_sequence.svg "Test case for template overload pattern")
## Generated Mermaid diagrams
![t20042_sequence](./t20042_sequence_mermaid.svg "Test case for template overload pattern")
## Generated JSON models
```json
{
  "diagram_type": "sequence",
  "name": "t20042_sequence",
  "participants": [
    {
      "display_name": "tmain()",
      "id": "609011973422503266",
      "name": "tmain",
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      "source_location": {
        "column": 6,
        "file": "t20042.cc",
        "line": 20,
        "translation_unit": "t20042.cc"
      },
      "type": "function"
    },
    {
      "activities": [
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            "file": "t20042.cc",
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            "translation_unit": "t20042.cc"
          },
          "type": "method"
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        {
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          "id": "505918958102707204",
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          },
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        }
      ],
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      "id": "169029708750481998",
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      "source_location": {
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        "file": "t20042.cc",
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        "translation_unit": "t20042.cc"
      },
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    },
    {
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          "id": "1635511505447928279",
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          },
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      ],
      "display_name": "BHandler",
      "id": "1969158228859108037",
      "name": "BHandler",
      "namespace": "clanguml::t20042",
      "source_location": {
        "column": 8,
        "file": "t20042.cc",
        "line": 10,
        "translation_unit": "t20042.cc"
      },
      "type": "class"
    }
  ],
  "sequences": [
    {
      "messages": [
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            "participant_id": "609011973422503266"
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          "scope": "normal",
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          "to": {
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          "source_location": {
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            "translation_unit": "t20042.cc"
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        {
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          "to": {
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            "participant_id": "1969158228859108037"
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          "type": "message"
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        {
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  "using_namespace": "clanguml::t20042"
}
```