ENH: Added test for auto_ptr. Documented aut_ptr template implementation.

1 files changed, 166 insertions, 0 deletions

diff --git a/Source/kwsys/testAutoPtr.cxx b/Source/kwsys/testAutoPtr.cxx
new file mode 100644
index 0000000..5afa599
--- /dev/null
+++ b/Source/kwsys/testAutoPtr.cxx
@@ -0,0 +1,166 @@
+/*=========================================================================
+
+  Program:   KWSys - Kitware System Library
+  Module:    $RCSfile$
+
+  Copyright (c) Kitware, Inc., Insight Consortium.  All rights reserved.
+  See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
+
+     This software is distributed WITHOUT ANY WARRANTY; without even
+     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+     PURPOSE.  See the above copyright notices for more information.
+
+=========================================================================*/
+#include "kwsysPrivate.h"
+#include KWSYS_HEADER(auto_ptr.hxx)
+
+// Work-around CMake dependency scanning limitation.  This must
+// duplicate the above list of headers.
+#if 0
+# include "auto_ptr.hxx.in"
+#endif
+
+#include <stdio.h>
+
+#define ASSERT(x,y) if (!(x)) { printf("FAIL: " y "\n"); status = 1; }
+
+static int instances = 0;
+
+struct A
+{
+  A() { ++instances; }
+  ~A() { --instances; }
+  A* self() {return this; }
+};
+struct B: public A {};
+
+static int function_call(kwsys::auto_ptr<A> a)
+{
+  return a.get()? 1:0;
+}
+
+static A* get_A(A& a) { return &a; }
+
+static kwsys::auto_ptr<A> generate_auto_ptr_A()
+{
+  return kwsys::auto_ptr<A>(new A);
+}
+
+static kwsys::auto_ptr<B> generate_auto_ptr_B()
+{
+  return kwsys::auto_ptr<B>(new B);
+}
+
+int testAutoPtr(int, char*[])
+{
+  int status = 0;
+
+  // Keep everything in a subscope so we can detect leaks.
+  {
+    kwsys::auto_ptr<A> pa0;
+    kwsys::auto_ptr<A> pa1(new A());
+    kwsys::auto_ptr<B> pb1(new B());
+    kwsys::auto_ptr<B> pb2(new B());
+    kwsys::auto_ptr<A> pa2(new B());
+
+    A* ptr = get_A(*pa1);
+    ASSERT(ptr == pa1.get(),
+          "auto_ptr does not return correct object when dereferenced");
+    ptr = pa1->self();
+    ASSERT(ptr == pa1.get(),
+          "auto_ptr does not return correct pointer from operator->");
+
+    A* before = pa0.get();
+    pa0.reset(new A());
+    ASSERT(pa0.get() && pa0.get() != before,
+          "auto_ptr empty after reset(new A())");
+
+    before = pa0.get();
+    pa0.reset(new B());
+    ASSERT(pa0.get() && pa0.get() != before,
+          "auto_ptr empty after reset(new B())");
+
+    delete pa0.release();
+    ASSERT(!pa0.get(), "auto_ptr holds an object after release()");
+
+    kwsys::auto_ptr<A> pa3(pb1);
+    ASSERT(!pb1.get(),
+           "auto_ptr full after being used to construct another");
+    ASSERT(pa3.get(),
+          "auto_ptr empty after construction from another");
+
+    {
+    kwsys::auto_ptr<A> pa;
+    pa = pa3;
+    ASSERT(!pa3.get(),
+           "auto_ptr full after assignment to another");
+    ASSERT(pa.get(),
+          "auto_ptr empty after assignment from another");
+    }
+
+    {
+    kwsys::auto_ptr<A> pa;
+    pa = pb2;
+    ASSERT(!pb2.get(),
+           "auto_ptr full after assignment to compatible");
+    ASSERT(pa.get(),
+          "auto_ptr empty after assignment from compatible");
+    }
+
+    {
+    int receive = function_call(pa2);
+    ASSERT(receive,
+           "auto_ptr did not receive ownership in called function");
+    ASSERT(!pa2.get(),
+           "auto_ptr did not release ownership to called function");
+    }
+
+    {
+    int received = function_call(generate_auto_ptr_A());
+    ASSERT(received,
+           "auto_ptr in called function did not take ownership "
+           "from factory function");
+    }
+
+    {
+    int received = function_call(generate_auto_ptr_B());
+    ASSERT(received,
+           "auto_ptr in called function did not take ownership "
+           "from factory function with conversion");
+    }
+
+    {
+    kwsys::auto_ptr<A> pa(generate_auto_ptr_A());
+    ASSERT(pa.get(),
+      "auto_ptr empty after construction from factory function");
+    }
+
+    {
+    kwsys::auto_ptr<A> pa;
+    pa = generate_auto_ptr_A();
+    ASSERT(pa.get(),
+      "auto_ptr empty after assignment from factory function");
+    }
+
+#if 0
+    {
+    kwsys::auto_ptr<A> pa(generate_auto_ptr_B());
+    ASSERT(pa.get(),
+      "auto_ptr empty after construction from compatible factory function");
+    }
+#endif
+
+#if 0
+    {
+    kwsys::auto_ptr<A> pa;
+    pa = generate_auto_ptr_B();
+    ASSERT(pa.get(),
+      "auto_ptr empty after assignment from compatible factory function");
+    }
+#endif
+  }
+
+  ASSERT(instances == 0, "auto_ptr leaked an object");
+
+  return status;
+}