feat: delegate constructor

chapters/chapter_02/CMakeLists.txt

@@ -8,7 +8,8 @@ add_library(
   src/range_based_for.cpp
   src/structured_binding.cpp
   src/type_inference.cpp
-  src/variadic_templates.cpp)
+  src/variadic_templates.cpp
+  src/delegate_constructor.cpp)
 
 target_compile_features(chapter_02 PUBLIC cxx_std_20)
 

chapters/chapter_02/include/delegate_constructor.h

@@ -0,0 +1,10 @@
+#pragma once
+
+#include "chapter_interface.h"
+
+class DelegateConstructor : public ChapterTest {
+  virtual void run() override;
+  virtual const char *name() const override {
+    return "Delegate constructor test";
+  };
+};

chapters/chapter_02/src/delegate_constructor.cpp

@@ -0,0 +1,22 @@
+#include "delegate_constructor.h"
+#include <iostream>
+#include <string>
+
+class Printer {
+private:
+  std::string value;
+
+public:
+  Printer(const std::string &value) : value(value){};
+  Printer(int value) : Printer(std::to_string(value)){};
+
+  void print() { std::cout << value << std::endl; }
+};
+
+void DelegateConstructor::run() {
+  std::cout << "print(\"hello\"): ";
+  Printer("hello").print();
+
+  std::cout << "print(23): ";
+  Printer(23).print();
+}

src/main.cpp

@@ -4,6 +4,7 @@
 #include <vector>
 
 #include "constexp.h"
+#include "delegate_constructor.h"
 #include "if_constexpr.h"
 #include "ifswitch.h"
 #include "initlist.h"
@@ -30,6 +31,7 @@ int main(int argc, char **argv) {
   chapter_2_tests.emplace_back(std::make_unique<IfConstexprTest>());
   chapter_2_tests.emplace_back(std::make_unique<RangeBasedForTest>());
   chapter_2_tests.emplace_back(std::make_unique<VariadicTemplates>());
+  chapter_2_tests.emplace_back(std::make_unique<DelegateConstructor>());
 
   for (auto &test : chapter_2_tests) {
     std::cout << "\n" << test->name() << ":" << std::endl;