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C++ to UML diagram generator based on Clang
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t20044 - Test case for template method call expressions with callables

Config

add_compile_flags:
- -fparse-all-comments
diagrams:
t20044_sequence:
type: sequence
glob:
- t20044.cc
type_aliases:
"clanguml::t20044::detail::expected<int,clanguml::t20044::error>": result_t
generate_message_comments: true
include:
namespaces:
- clanguml::t20044
exclude:
namespaces:
- clanguml::t20044::detail2
using_namespace: clanguml::t20044
from:
- function: "clanguml::t20044::tmain()"

Source code

File tests/t20044/t20044.cc

// #include "include/expected.hpp"
#include <functional>
#include <optional>
#include <thread>
namespace clanguml {
namespace t20044 {
enum class error { OK, FAIL };
namespace detail {
// Trivial std::expected mock-up just for testing calls through lambda
// expressions passed as arguments to methods
template <typename V, typename E> class expected {
private:
std::optional<V> value_;
std::optional<E> error_;
public:
explicit expected(V v)
: value_{std::move(v)}
{
}
explicit expected(E e)
: error_{std::move(e)}
{
}
const auto &value() const { return *value_; }
const auto &error() const { return *error_; }
template <class F> auto and_then(F &&f) &&
{
if (value_)
return f(*value_);
return *this;
}
};
} // namespace detail
namespace detail2 {
template <typename F> void run(F &&f) { f(); }
} // namespace detail2
using result_t = detail::expected<int, error>;
struct A {
auto a() const { }
auto a1() const { return result_t{10}; }
auto a2(int arg) const { return result_t{arg + 1}; }
auto a4(int arg) const { return result_t{arg + 1}; }
void a5() { }
};
auto a3(int arg) { return result_t{arg + 1}; }
struct R {
template <typename F> R(F &&f) { f(); }
};
int tmain()
{
A a;
// Call to template constructor with callable parameter and lambda
// expression as argument
R r([&a]() { a.a(); });
std::function<result_t(const A &, int)> a4_wrapper = &A::a4;
std::function<result_t(int)> a4_wrapper_to_a =
std::bind(a4_wrapper, a, std::placeholders::_1);
// The message to detail2::run() is skipped due to exclude filter, however
// the call to lambda and A::a5() is rendered
// TODO: Add some marker to highlight that this is not a direct call
detail2::run([&]() { a.a5(); });
return a
.a1()
// Call to a template method accepting a callable with lambda expression
// as argument, fully tracked showing method's activity and
.and_then([&](auto &&arg) { return a.a2(arg); })
// TODO: Call to a method accepting a callable with function pointer
// as argument
.and_then(a3)
// TODO: Call to a method accepting a callable with std::function as
// argument
.and_then(a4_wrapper_to_a)
.value();
}
}
}

Generated PlantUML diagrams

Generated Mermaid diagrams

Generated JSON models

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