From 6b44326c49bb009c42356518494f346828c71d86 Mon Sep 17 00:00:00 2001
From: Vasily Levchenko <vasily.levchenko@jetbrains.com>
Date: Wed, 7 Sep 2016 13:21:16 +0300
Subject: [PATCH] life cycle in D, RAII and non scoped object creations,
 perhaps illustraion of allocation could be interesting as well

---
 src/main/d/lifetime.d | 117 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 src/main/d/lifetime.d

diff --git a/src/main/d/lifetime.d b/src/main/d/lifetime.d
new file mode 100644
index 00000000000..042eefc50a4
--- /dev/null
+++ b/src/main/d/lifetime.d
@@ -0,0 +1,117 @@
+/**
+ * The D language investigations:
+ * here life events except perhaps allocator stage ()
+ * # dmd -v -vgc -I/opt/local//libexec/dmd-bootstrap/include/druntime/import -I/opt/local/libexec/dmd-bootstrap/include/phobos -L-L/opt/local/libexec/dmd-bootstrap/lib lifetime.d
+ * Expected output for 
+ * bash-3.2$ dmd --version
+ * DMD64 D Compiler v2.070-devel
+ * Copyright (c) 1999-2015 by Digital Mars written by Walter Bright
+ * 
+
+ * bash-3.2$ ./lifetime
+A::static_this: start
+A::static_this: end
+main:start
+(4557316096)lifetime.A::this: start
+(4557316096)lifetime.A::this: end
+(4557316112)lifetime.A::this: start
+(4557316112)lifetime.A::this: end
+inner scope started
+(140734540366608)lifetime.A::this: start
+(140734540366608)lifetime.A::this: end
+(140734540366608)lifetime.A::~this: start
+(140734540366608)lifetime.A::~this: end
+inner scope ended
+(4557316096)lifetime.A::~this: start
+(4557316096)lifetime.A::~this: end
+scopedAllocations::called
+scopedAllocations::start
+(140734540366432)lifetime.A::this: start
+(140734540366432)lifetime.A::this: end
+(140734540366464)lifetime.A::this: start
+(140734540366464)lifetime.A::this: end
+(140734540366496)lifetime.A::this: start
+(140734540366496)lifetime.A::this: end
+scopedAllocations::end
+(140734540366496)lifetime.A::~this: start
+(140734540366496)lifetime.A::~this: end
+(140734540366464)lifetime.A::~this: start
+(140734540366464)lifetime.A::~this: end
+(140734540366432)lifetime.A::~this: start
+(140734540366432)lifetime.A::~this: end
+scopedAllocations::returned
+main:end
+A::~static this: start
+A::~static this: end
+(4557316112)lifetime.A::~this: start
+(4557316112)lifetime.A::~this: end
+ */
+import object;
+import std.string;
+import std.stdio;
+import std.typecons;
+
+class A {
+  static this() {
+    writeln("A::static_this: start");
+    writeln("A::static_this: end");
+  }
+  this() {
+    trace("this: start", this);
+    trace("this: end", this);
+  }
+  
+  ~this() {
+    trace("~this: start", this);
+    trace("~this: end", this);
+  }
+
+  static ~this() {
+    writeln("A::~static this: start");
+    writeln("A::~static this: end");
+  }
+}
+
+void trace(string msg, Object obj) {
+  write("(");
+  write(obj.toHash());
+  write(")");
+  write(obj.classinfo.toString());
+  write("::");
+  writeln(msg);
+}
+
+
+void scopedAllocations() {
+  writeln("scopedAllocations::start");
+  auto a = scoped!A();
+  auto b = scoped!A();
+  auto c = scoped!A();
+    writeln("scopedAllocations::end");
+}
+
+void main() {
+     writeln("main:start");
+     auto a = new A();
+     auto c = new A();
+     auto d = Object.factory("A");
+     {
+       writeln("inner scope started");
+       auto b = scoped!A();
+     }
+     writeln("inner scope ended");
+     delete a;
+     writeln("scopedAllocations::called");
+     scopedAllocations();
+     writeln("scopedAllocations::returned");
+     writeln("main:end");
+}
+
+extern(C) {
+  /**
+   * ABI compatibility, known bug in 2.70 :)
+   */
+  void __dmd_personality_v0(){}
+  void _d_throwdwarf(){}
+  void __dmd_begin_catch(){}
+}