creational patterns slides

.vscode/tasks.json

@@ -0,0 +1,28 @@
+{
+    "tasks": [
+        {
+            "type": "cppbuild",
+            "label": "C/C++: g++.exe build active file",
+            "command": "C:\\Program Files\\CodeBlocks\\MinGW\\bin\\g++.exe",
+            "args": [
+                "-fdiagnostics-color=always",
+                "-g",
+                "${file}",
+                "-o",
+                "${fileDirname}\\${fileBasenameNoExtension}.exe"
+            ],
+            "options": {
+                "cwd": "${fileDirname}"
+            },
+            "problemMatcher": [
+                "$gcc"
+            ],
+            "group": {
+                "kind": "build",
+                "isDefault": true
+            },
+            "detail": "Task generated by Debugger."
+        }
+    ],
+    "version": "2.0.0"
+}

slides.cpp

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+#include <iostream>
+#include <string>
+
+class ConfigurationManager {
+private:
+    static ConfigurationManager* instance;
+    ConfigurationManager() {
+        std::cout << "Loading configuration from file...\n";
+    }
+public:
+    static ConfigurationManager* getInstance() {
+        if(instance == nullptr)
+            instance = new ConfigurationManager();
+        return instance;
+    }
+    std::string getConfigValue(const std::string& key) {
+        return "Value for " + key;
+    }
+};
+
+ConfigurationManager* ConfigurationManager::instance = nullptr;
+int main() {
+    ConfigurationManager* config1 = ConfigurationManager::getInstance();
+    ConfigurationManager* config2 = ConfigurationManager::getInstance();
+
+    std::cout << config1->getConfigValue("Setting 1") << std::endl;
+    std::cout << config2->getConfigValue("Setting 2") << std::endl; 
+}