Move initializer to its own example

dub.json

@@ -135,6 +135,18 @@
 			"importPaths": [
 				"source"
 			]
+		},
+		{
+			"name" : "injectionInitializerExample",
+			"description" : "Example where the usage of an injection initializer is demonstrated.",
+			"targetType": "executable",
+			"targetName": "injectionInitializerExample",
+			"sourcePaths": [
+				"example/injectioninitializer"
+			],
+			"importPaths": [
+				"source"
+			]
 		}
 	]
 }

example/constructorinjection/app.d

@@ -5,6 +5,8 @@
  * The full terms of the license can be found in the LICENSE file.
  */
 
+ import std.stdio;
+
 class Scheduler {
 	private Calendar calendar;
 
@@ -36,18 +38,10 @@ class Calendar {
 	}
 }
 
-import std.stdio;
-
 class HardwareClock {
 	// Parameterless constructors will halt any further selection of constructors.
-	this() {
-		writeln("default constructor");
-	}	
+	this() {}	
 	
-	this(string name) {
-		writeln(name);
-	}
-
 	// As a result, this constructor will not be used when HardwareClock is created.
 	this(Calendar calendar) {
 		throw new Exception("This constructor should not be used by Poodinis");
@@ -64,10 +58,7 @@ void main() {
 	auto dependencies = new shared DependencyContainer();
 	dependencies.register!Scheduler;
 	dependencies.register!Calendar;
-	dependencies.register!HardwareClock( {
-		writeln("Running the creator");
-		return new HardwareClock("clock name");
-	});
+	dependencies.register!HardwareClock;
 
 	auto scheduler = dependencies.resolve!Scheduler;
 	scheduler.scheduleJob();

example/injectioninitializer/app.d

@@ -0,0 +1,24 @@
+/**
+ * Poodinis Dependency Injection Framework
+ * Copyright 2014-2021 Mike Bierlee
+ * This software is licensed under the terms of the MIT license.
+ * The full terms of the license can be found in the LICENSE file.
+ */
+
+import poodinis;
+import std.stdio;
+
+class Doohickey
+{
+}
+
+void main()
+{
+    auto dependencies = new shared DependencyContainer();
+    dependencies.register!Doohickey({
+        writeln("Creating Doohickey via initializer delegate.");
+        return new Doohickey();
+    });
+
+    dependencies.resolve!Doohickey;
+}

source/poodinis/container.d

@@ -202,7 +202,7 @@ synchronized class DependencyContainer {
     }
 
     /**
-     * 
+     * TODO: Deduplicate code
      */
     Registration register(SuperType, ConcreteType : SuperType)(InjectionInitializer!SuperType initializer, 
             RegistrationOption options = RegistrationOption.none)