# t20046 - Test case for call expressions in nested lambdas
## Config
```yaml
add_compile_flags:
  - -fparse-all-comments
diagrams:
  t20046_sequence:
    type: sequence
    glob:
      - t20046.cc
    include:
      namespaces:
        - clanguml::t20046
    using_namespace: clanguml::t20046
    from:
      - function: "clanguml::t20046::tmain()"
```
## Source code
File `tests/t20046/t20046.cc`
```cpp
namespace clanguml {
namespace t20046 {

template <typename F> int a1(F &&f) { return f(42); }

int a2(int x) { return 2; }

int a3(int x) { return 3; }

int tmain()
{
    // Call expression in a nested lambda
    auto v1 = [](auto &&arg1) {
        return [](auto &&arg2) { return a2(arg2); }(arg1);
    }(0);

    // Call expression in a nested lambda in call expression
    auto v4 = a1(
        [](auto &&arg1) { return [](auto &&arg2) { return a3(arg2); }(arg1); });

    return 0;
}
}
}
```
## Generated PlantUML diagrams
![t20046_sequence](./t20046_sequence.svg "Test case for call expressions in nested lambdas")
## Generated Mermaid diagrams
![t20046_sequence](./t20046_sequence_mermaid.svg "Test case for call expressions in nested lambdas")
## Generated JSON models
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}
```