chore: setup Builder

.gitignore

@@ -0,0 +1,4 @@
+.build/
+.cache/
+bin/
+compile_commands.json

Builder/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.20)
+
+project(
+  Builder
+  VERSION 0.1.0
+  LANGUAGES CXX)
+
+list(APPEND CMAKE_MODULE_PATH "${PROJECT_SOURCE_DIR}/../cmake")
+
+include(ExportCompileCommands)
+include(sccache)
+
+add_executable(Builder main.cpp)
+
+target_compile_features(Builder PUBLIC cxx_std_20)
+
+set_target_properties(
+  Builder
+  PROPERTIES ARCHIVE_OUTPUT_DIRECTORY "${PROJECT_SOURCE_DIR}/bin"
+             RUNTIME_OUTPUT_DIRECTORY "${PROJECT_SOURCE_DIR}/bin"
+             RUNTIME_OUTPUT_DIRECTORY "${PROJECT_SOURCE_DIR}/bin")

Builder/bootstrap.sh

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+#!/usr/bin/env sh
+
+cmake -S . -B .build -G Ninja -D CMAKE_EXPORT_COMPILE_COMMANDS=ON
+ln -s .build/compile_commands.json

Builder/build.sh

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+#!/usr/bin/env sh 
+
+cmake --build .build 

Builder/main.cpp

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+#include <iostream>
+
+int main(int argc, char *argv[]) {
+
+  std::cout << "Builder" << std::endl;
+
+  return EXIT_SUCCESS;
+}

Singleton/main.cpp

@@ -1,9 +1,42 @@
 #include <cstdlib>
+#include <iomanip>
 #include <iostream>
+#include <mutex>
+
+class Singleton {
+private:
+  static Singleton *singleton;
+  static std::mutex mutex;
+
+  Singleton() = default;
+
+public:
+  Singleton(const Singleton &other) = delete;
+  Singleton &operator=(const Singleton &) = delete;
+
+  static Singleton *GetInstance() {
+    std::lock_guard<std::mutex> lock(mutex);
+
+    if (singleton == nullptr) {
+      singleton = new Singleton();
+    }
+
+    return singleton;
+  }
+};
+
+Singleton *Singleton::singleton = nullptr;
+std::mutex Singleton::mutex;
 
 int main(int argc, char *argv[]) {
 
   std::cout << "Singleton" << std::endl;
 
+  auto singleton1 = Singleton::GetInstance();
+  auto singleton2 = Singleton::GetInstance();
+
+  std::cout << std::setw(20) << "Singleton 1: " << singleton1 << std::endl;
+  std::cout << std::setw(20) << "Singleton 2: " << singleton2 << std::endl;
+
   return EXIT_SUCCESS;
 }