cpp code example for exercise in "producing libraries" session

content/code/01_libraries-cxx/CMakeLists.txt

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+# FIXME set minimum cmake version
+cmake_minimum_required(...)
+
+# FIXME declare project giving project name and language
+project(... LANGUAGES ...)
+
+# FIXME create the message library from the source files
+add_library(...)
+
+# FIXME create hello-world executable from hello-world.cpp
+add_executable(hello-world ...)
+
+# FIXME link hello-world to the message library
+target_link_libraries(hello-world ...)

content/code/01_libraries-cxx/Message.cpp

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+#include "Message.hpp"
+
+#include <iostream>
+#include <string>
+
+std::ostream &Message::printObject(std::ostream &os) {
+  os << "This is my very nice message: " << std::endl;
+  os << message_;
+
+  return os;
+}

content/code/01_libraries-cxx/Message.hpp

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+#pragma once
+
+#include <iosfwd>
+#include <string>
+
+class Message {
+public:
+  Message(const std::string &m) : message_(m) {}
+
+  friend std::ostream &operator<<(std::ostream &os, Message &obj) {
+    return obj.printObject(os);
+  }
+
+private:
+  std::string message_;
+  std::ostream &printObject(std::ostream &os);
+};

content/code/01_libraries-cxx/hello-world.cpp

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+#include "Message.hpp"
+
+#include <cstdlib>
+#include <iostream>
+
+int main() {
+  Message say_hello("Hello, CMake World!");
+
+  std::cout << say_hello << std::endl;
+
+  Message say_goodbye("Goodbye, CMake World");
+
+  std::cout << say_goodbye << std::endl;
+
+  return EXIT_SUCCESS;
+}

content/code/01_libraries-cxx/solution/CMakeLists.txt

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+# set minimum cmake version
+cmake_minimum_required(VERSION 3.18)
+
+# project name and language
+project(libraries LANGUAGES CXX)
+
+# generate a library from sources
+add_library(message
+  Message.hpp
+  Message.cpp
+  )
+
+add_executable(hello-world hello-world.cpp)
+
+target_link_libraries(hello-world PRIVATE message)

content/code/01_libraries-cxx/solution/Message.cpp

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+#include "Message.hpp"
+
+#include <iostream>
+#include <string>
+
+std::ostream &Message::printObject(std::ostream &os) {
+  os << "This is my very nice message: " << std::endl;
+  os << message_;
+
+  return os;
+}

content/code/01_libraries-cxx/solution/Message.hpp

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+#pragma once
+
+#include <iosfwd>
+#include <string>
+
+class Message {
+public:
+  Message(const std::string &m) : message_(m) {}
+
+  friend std::ostream &operator<<(std::ostream &os, Message &obj) {
+    return obj.printObject(os);
+  }
+
+private:
+  std::string message_;
+  std::ostream &printObject(std::ostream &os);
+};

content/code/01_libraries-cxx/solution/hello-world.cpp

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+#include "Message.hpp"
+
+#include <cstdlib>
+#include <iostream>
+
+int main() {
+  Message say_hello("Hello, CMake World!");
+
+  std::cout << say_hello << std::endl;
+
+  Message say_goodbye("Goodbye, CMake World");
+
+  std::cout << say_goodbye << std::endl;
+
+  return EXIT_SUCCESS;
+}