# t20012 - Lambda expression call sequence diagram test case
## Config
```yaml
compilation_database_dir: ..
output_directory: puml
diagrams:
  t20012_sequence:
    type: sequence
    glob:
      - ../../tests/t20012/t20012.cc
    include:
      namespaces:
        - clanguml::t20012
    using_namespace:
      - clanguml::t20012
    start_from:
      - function: "clanguml::t20012::tmain()"
```
## Source code
File t20012.cc
```cpp
#include <algorithm>
#include <functional>
#include <memory>
#include <optional>
#include <utility>

namespace clanguml {
namespace t20012 {
struct A {
    void a() { aa(); }

    void aa() { aaa(); }

    void aaa() { }
};

struct B {
    void b() { bb(); }

    void bb() { bbb(); }

    void bbb() { }

    void eb() { }
};

struct C {
    void c() { cc(); }

    void cc() { ccc(); }

    void ccc() { }
};

struct D {
    int add5(int arg) const { return arg + 5; }
};

class E {
    std::optional<std::shared_ptr<B>> maybe_b;
    std::shared_ptr<A> a;

public:
    template <typename F> void setup(F &&f) { f(maybe_b); }
};

template <typename F> struct R {
    R(F &&f)
        : f_{std::move(f)}
    {
    }

    void r() { f_(); }

    F f_;
};

void tmain()
{
    A a;
    B b;
    C c;

    // The activity shouldn't be marked at the lambda definition, but
    // wherever it is actually called...
    auto alambda = [&a, &b]() {
        a.a();
        b.b();
    };

    // ...like here
    alambda();

    // There should be no call to B in the sequence diagram as the blambda
    // is never called
    [[maybe_unused]] auto blambda = [&b]() { b.b(); };

    // Nested lambdas should also work
    auto clambda = [alambda, &c]() {
        c.c();
        alambda();
    };
    clambda();

    R r{[&c]() { c.c(); }};

    r.r();

    D d;

    std::vector<int> ints{0, 1, 2, 3, 4};
    std::transform(ints.begin(), ints.end(), ints.begin(),
        [&d](auto i) { return d.add5(i); });

    // TODO: Fix naming function call arguments which are lambdas
    //    E e;
    //
    //    e.setup([](auto &&arg) mutable {
    //        // We cannot know here what 'arg' might be
    //        arg.value()->eb();
    //    });
}
}
}
```
## Generated UML diagrams
![t20012_sequence](./t20012_sequence.svg "Lambda expression call sequence diagram test case")
## Generated JSON models
```json
{
  "diagram_type": "sequence",
  "metadata": {
    "clang_uml_version": "0.3.5",
    "llvm_version": "Ubuntu clang version 15.0.6",
    "schema_version": 1
  },
  "name": "t20012_sequence",
  "participants": [
    {
      "id": "893699278278125827",
      "name": "clanguml::t20012::tmain()",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 58
      },
      "type": "function"
    },
    {
      "id": "871571755123349249",
      "name": "clanguml::t20012::tmain()::(lambda ../../tests/t20012/t20012.cc:66:20)",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 66
      },
      "type": "class"
    },
    {
      "id": "1798184226128732119",
      "name": "clanguml::t20012::A",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 9
      },
      "type": "class"
    },
    {
      "id": "1893469899260202653",
      "name": "clanguml::t20012::B",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 17
      },
      "type": "class"
    },
    {
      "id": "516948909715002916",
      "name": "clanguml::t20012::tmain()::(lambda ../../tests/t20012/t20012.cc:79:20)",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 79
      },
      "type": "class"
    },
    {
      "id": "2071958121786360262",
      "name": "clanguml::t20012::C",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 27
      },
      "type": "class"
    },
    {
      "id": "1639905845562724067",
      "name": "clanguml::t20012::R<R::(lambda ../../tests/t20012/t20012.cc:85:9)>",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 47
      },
      "type": "class"
    },
    {
      "id": "105322683015690128",
      "name": "clanguml::t20012::tmain()::(lambda ../../tests/t20012/t20012.cc:85:9)",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 85
      },
      "type": "class"
    },
    {
      "id": "1627226326147373737",
      "name": "clanguml::t20012::D",
      "source_location": {
        "file": "../../tests/t20012/t20012.cc",
        "line": 35
      },
      "type": "class"
    }
  ],
  "sequences": [
    {
      "messages": [
        {
          "from": {
            "activity_id": "893699278278125827",
            "activity_name": "clanguml::t20012::tmain()",
            "participant_id": "893699278278125827",
            "participant_name": "clanguml::t20012::tmain()"
          },
          "name": "operator()()",
          "return_type": "",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 72
          },
          "to": {
            "activity_id": "601151241333493101",
            "activity_name": "clanguml::t20012::tmain()##(lambda ../../tests/t20012/t20012.cc:66:20)::operator()()",
            "participant_id": "871571755123349249"
          },
          "type": "message"
        },
        {
          "from": {
            "activity_id": "601151241333493101",
            "activity_name": "clanguml::t20012::tmain()::(lambda ../../tests/t20012/t20012.cc:66:20)::operator()()",
            "participant_id": "871571755123349249"
          },
          "name": "a()",
          "return_type": "void",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 67
          },
          "to": {
            "activity_id": "1871432932744498976",
            "activity_name": "clanguml::t20012::A::a()",
            "participant_id": "1798184226128732119"
          },
          "type": "message"
        },
        {
          "from": {
            "activity_id": "1871432932744498976",
            "activity_name": "clanguml::t20012::A::a()",
            "participant_id": "1798184226128732119"
          },
          "name": "aa()",
          "return_type": "void",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 10
          },
          "to": {
            "activity_id": "1100933039353876539",
            "activity_name": "clanguml::t20012::A::aa()",
            "participant_id": "1798184226128732119"
          },
          "type": "message"
        },
        {
          "from": {
            "activity_id": "1100933039353876539",
            "activity_name": "clanguml::t20012::A::aa()",
            "participant_id": "1798184226128732119"
          },
          "name": "aaa()",
          "return_type": "void",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 12
          },
          "to": {
            "activity_id": "941636185823691898",
            "activity_name": "clanguml::t20012::A::aaa()",
            "participant_id": "1798184226128732119"
          },
          "type": "message"
        },
        {
          "from": {
            "activity_id": "601151241333493101",
            "activity_name": "clanguml::t20012::tmain()::(lambda ../../tests/t20012/t20012.cc:66:20)::operator()()",
            "participant_id": "871571755123349249"
          },
          "name": "b()",
          "return_type": "void",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 68
          },
          "to": {
            "activity_id": "2142697410385270633",
            "activity_name": "clanguml::t20012::B::b()",
            "participant_id": "1893469899260202653"
          },
          "type": "message"
        },
        {
          "from": {
            "activity_id": "2142697410385270633",
            "activity_name": "clanguml::t20012::B::b()",
            "participant_id": "1893469899260202653"
          },
          "name": "bb()",
          "return_type": "void",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 18
          },
          "to": {
            "activity_id": "973718340784931313",
            "activity_name": "clanguml::t20012::B::bb()",
            "participant_id": "1893469899260202653"
          },
          "type": "message"
        },
        {
          "from": {
            "activity_id": "973718340784931313",
            "activity_name": "clanguml::t20012::B::bb()",
            "participant_id": "1893469899260202653"
          },
          "name": "bbb()",
          "return_type": "void",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 20
          },
          "to": {
            "activity_id": "195788529004378403",
            "activity_name": "clanguml::t20012::B::bbb()",
            "participant_id": "1893469899260202653"
          },
          "type": "message"
        },
        {
          "from": {
            "activity_id": "893699278278125827",
            "activity_name": "clanguml::t20012::tmain()",
            "participant_id": "893699278278125827",
            "participant_name": "clanguml::t20012::tmain()"
          },
          "name": "operator()()",
          "return_type": "",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 83
          },
          "to": {
            "activity_id": "435249756897748529",
            "activity_name": "clanguml::t20012::tmain()##(lambda ../../tests/t20012/t20012.cc:79:20)::operator()()",
            "participant_id": "516948909715002916"
          },
          "type": "message"
        },
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          },
          "name": "c()",
          "return_type": "void",
          "scope": "normal",
          "source_location": {
            "file": "../../tests/t20012/t20012.cc",
            "line": 80
          },
          "to": {
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            "activity_name": "clanguml::t20012::C::c()",
            "participant_id": "2071958121786360262"
          },
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            "participant_id": "2071958121786360262"
          },
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          "return_type": "void",
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          "source_location": {
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            "line": 28
          },
          "to": {
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          },
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          },
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          },
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      "start_from": {
        "id": 893699278278125827,
        "location": "clanguml::t20012::tmain()"
      }
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  ],
  "using_namespace": "clanguml::t20012"
}
```