Add post-constructor/pre-destructor example

.travis.yml

@@ -26,3 +26,4 @@ script:
   - dub build --build=release --config=registerOnResolveExample
   - dub build --build=release --config=constructorInjectionExample
   - dub build --build=release --config=valueInjectionExample
+  - dub build --build=release --config=postConstructorPreDestructorExample

dub.json

@@ -122,6 +122,18 @@
 			"importPaths": [
 				"source"
 			]
+		},
+		{
+			"name" : "postConstructorPreDestructorExample",
+			"description" : "Example where the usage of post-constructors and pre-destructors are demonstrated.",
+			"targetType": "executable",
+			"targetName": "postConstructorPreDestructorExample",
+			"sourcePaths": [
+				"example/postconstructorpredestructor"
+			],
+			"importPaths": [
+				"source"
+			]
 		}
 	]
 }

example/postconstructorpredestructor/app.d

@@ -0,0 +1,53 @@
+/**
+ * Poodinis Dependency Injection Framework
+ * Copyright 2014-2016 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 ADependency {
+	@PostConstruct
+	public void postConstructor() {
+		writeln("The dependency is created.");
+	}
+
+	public void callMe() {
+		writeln("The dependency was called.");
+	}
+}
+
+class AClass {
+	@Autowire
+	public ADependency dependency; // Dependencies are autowired before the post-constructor is called.
+
+	@PostConstruct
+	public void postConstructor() {
+		writeln("The class is created.");
+		if (dependency !is null) {
+			writeln("The dependency is autowired.");
+		} else {
+			writeln("The dependency was NOT autowired.");
+		}
+	}
+
+	@PreDestroy
+	public void preDestructor() {
+		writeln("The class is no longer registered with the container.");
+	}
+}
+
+public void main() {
+	auto container = new shared DependencyContainer();
+	container.register!ADependency;
+	container.register!AClass;
+	auto instance = container.resolve!AClass; // Will cause the post constructor to be called.
+	container.removeRegistration!AClass; // Will cause the pre destructor to be called.
+
+	// The instance won't be destroyed by the container and as long as there are references to it,
+	// it will not be collected by the garbage collector either.
+	instance.dependency.callMe();
+}