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clang-uml/docs/test_cases/t20019.md
2022-12-10 16:37:28 +01:00

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# t20019 - Curiously Recurring Template Pattern sequence diagram test case
## Config
```yaml
compilation_database_dir: ..
output_directory: puml
diagrams:
t20019_sequence:
type: sequence
glob:
- ../../tests/t20019/t20019.cc
include:
namespaces:
- clanguml::t20019
using_namespace:
- clanguml::t20019
start_from:
- function: "clanguml::t20019::tmain()"
```
## Source code
File t20019.cc
```cpp
#include <cstdio>
namespace clanguml {
namespace t20019 {
// From https://en.cppreference.com/w/cpp/language/crtp
template <class Derived> struct Base {
void name() { (static_cast<Derived *>(this))->impl(); }
};
struct D1 : public Base<D1> {
void impl() { std::puts("D1::impl()"); }
};
struct D2 : public Base<D2> {
void impl() { std::puts("D2::impl()"); }
};
void tmain()
{
Base<D1> b1;
b1.name();
Base<D2> b2;
b2.name();
D1 d1;
d1.name();
D2 d2;
d2.name();
}
}
}
```
## Generated UML diagrams
![t20019_sequence](./t20019_sequence.svg "Curiously Recurring Template Pattern sequence diagram test case")