Avoid using KWSys auto_ptr by adopting it ourselves

Replace use of cmsys::auto_ptr with a CM_AUTO_PTR macro that maps to
our own implementation adopted from the KWSys auto_ptr implementation.
Later we may be able to map CM_AUTO_PTR to std::auto_ptr on compilers
that do not warn about it.

Automate the client site conversions:

    git grep -l auto_ptr -- Source/ | grep -v Source/kwsys/ | xargs sed -i \
      's|cmsys::auto_ptr|CM_AUTO_PTR|;s|cmsys/auto_ptr.hxx|cm_auto_ptr.hxx|'

1 files changed, 221 insertions, 0 deletions

diff --git a/Source/cm_auto_ptr.hxx b/Source/cm_auto_ptr.hxx
new file mode 100644
index 0000000..2cd35c3
--- /dev/null
+++ b/Source/cm_auto_ptr.hxx
@@ -0,0 +1,221 @@
+/*============================================================================
+  CMake - Cross Platform Makefile Generator
+  Copyright 2000-2016 Kitware, Inc.
+
+  Distributed under the OSI-approved BSD License (the "License");
+  see accompanying file Copyright.txt for details.
+
+  This software is distributed WITHOUT ANY WARRANTY; without even the
+  implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+  See the License for more information.
+============================================================================*/
+#ifndef CM_AUTO_PTR_HXX
+#define CM_AUTO_PTR_HXX
+
+#include <cmsys/Configure.hxx>
+
+// FIXME: Use std::auto_ptr on compilers that do not warn about it.
+#define CM_AUTO_PTR cm::auto_ptr
+
+// The HP compiler cannot handle the conversions necessary to use
+// auto_ptr_ref to pass an auto_ptr returned from one function
+// directly to another function as in use_auto_ptr(get_auto_ptr()).
+// We instead use const_cast to achieve the syntax on those platforms.
+// We do not use const_cast on other platforms to maintain the C++
+// standard design and guarantee that if an auto_ptr is bound
+// to a reference-to-const then ownership will be maintained.
+#if defined(__HP_aCC)
+#define cm_AUTO_PTR_REF 0
+#define cm_AUTO_PTR_CONST const
+#define cm_AUTO_PTR_CAST(a) cast(a)
+#else
+#define cm_AUTO_PTR_REF 1
+#define cm_AUTO_PTR_CONST
+#define cm_AUTO_PTR_CAST(a) a
+#endif
+
+// In C++11, clang will warn about using dynamic exception specifications
+// as they are deprecated.  But as this class is trying to faithfully
+// mimic std::auto_ptr, we want to keep the 'throw()' decorations below.
+// So we suppress the warning.
+#if defined(__clang__) && defined(__has_warning)
+#if __has_warning("-Wdeprecated")
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wdeprecated"
+#endif
+#endif
+
+namespace cm {
+
+template <class X>
+class auto_ptr;
+
+#if cm_AUTO_PTR_REF
+namespace detail {
+// The auto_ptr_ref template is supposed to be a private member of
+// auto_ptr but Borland 5.8 cannot handle it.  Instead put it in
+// a private namespace.
+template <class Y>
+struct auto_ptr_ref
+{
+  Y* p_;
+
+  // The extra constructor argument prevents implicit conversion to
+  // auto_ptr_ref from auto_ptr through the constructor.  Normally
+  // this should be done with the explicit keyword but Borland 5.x
+  // generates code in the conversion operator to call itself
+  // infinately.
+  auto_ptr_ref(Y* p, int)
+    : p_(p)
+  {
+  }
+};
+}
+#endif
+
+/** C++98 Standard Section 20.4.5 - Template class auto_ptr.  */
+template <class X>
+class auto_ptr
+{
+#if !cm_AUTO_PTR_REF
+  template <typename Y>
+  static inline auto_ptr<Y>& cast(auto_ptr<Y> const& a)
+  {
+    return const_cast<auto_ptr<Y>&>(a);
+  }
+#endif
+
+  /** The pointer to the object held.  */
+  X* x_;
+
+public:
+  /** The type of object held by the auto_ptr.  */
+  typedef X element_type;
+
+  /** Construct from an auto_ptr holding a compatible object.  This
+      transfers ownership to the newly constructed auto_ptr.  */
+  template <class Y>
+  auto_ptr(auto_ptr<Y> cm_AUTO_PTR_CONST& a) throw()
+    : x_(cm_AUTO_PTR_CAST(a).release())
+  {
+  }
+
+  /** Assign from an auto_ptr holding a compatible object.  This
+      transfers ownership to the left-hand-side of the assignment.  */
+  template <class Y>
+  auto_ptr& operator=(auto_ptr<Y> cm_AUTO_PTR_CONST& a) throw()
+  {
+    this->reset(cm_AUTO_PTR_CAST(a).release());
+    return *this;
+  }
+
+  /**
+   * Explicitly construct from a raw pointer.  This is typically
+   * called with the result of operator new.  For example:
+   *
+   *   auto_ptr<X> ptr(new X());
+   */
+  explicit auto_ptr(X* p = 0) throw()
+    : x_(p)
+  {
+  }
+
+  /** Construct from another auto_ptr holding an object of the same
+      type.  This transfers ownership to the newly constructed
+      auto_ptr.  */
+  auto_ptr(auto_ptr cm_AUTO_PTR_CONST& a) throw()
+    : x_(cm_AUTO_PTR_CAST(a).release())
+  {
+  }
+
+  /** Assign from another auto_ptr holding an object of the same type.
+      This transfers ownership to the newly constructed auto_ptr.  */
+  auto_ptr& operator=(auto_ptr cm_AUTO_PTR_CONST& a) throw()
+  {
+    this->reset(cm_AUTO_PTR_CAST(a).release());
+    return *this;
+  }
+
+  /** Destruct and delete the object held.  */
+  ~auto_ptr() throw()
+  {
+    // Assume object destructor is nothrow.
+    delete this->x_;
+  }
+
+  /** Dereference and return a reference to the object held.  */
+  X& operator*() const throw() { return *this->x_; }
+
+  /** Return a pointer to the object held.  */
+  X* operator->() const throw() { return this->x_; }
+
+  /** Return a pointer to the object held.  */
+  X* get() const throw() { return this->x_; }
+
+  /** Return a pointer to the object held and reset to hold no object.
+      This transfers ownership to the caller.  */
+  X* release() throw()
+  {
+    X* x = this->x_;
+    this->x_ = 0;
+    return x;
+  }
+
+  /** Assume ownership of the given object.  The object previously
+      held is deleted.  */
+  void reset(X* p = 0) throw()
+  {
+    if (this->x_ != p) {
+      // Assume object destructor is nothrow.
+      delete this->x_;
+      this->x_ = p;
+    }
+  }
+
+  /** Convert to an auto_ptr holding an object of a compatible type.
+      This transfers ownership to the returned auto_ptr.  */
+  template <class Y>
+  operator auto_ptr<Y>() throw()
+  {
+    return auto_ptr<Y>(this->release());
+  }
+
+#if cm_AUTO_PTR_REF
+  /** Construct from an auto_ptr_ref.  This is used when the
+      constructor argument is a call to a function returning an
+      auto_ptr.  */
+  auto_ptr(detail::auto_ptr_ref<X> r) throw()
+    : x_(r.p_)
+  {
+  }
+
+  /** Assign from an auto_ptr_ref.  This is used when a function
+      returning an auto_ptr is passed on the right-hand-side of an
+      assignment.  */
+  auto_ptr& operator=(detail::auto_ptr_ref<X> r) throw()
+  {
+    this->reset(r.p_);
+    return *this;
+  }
+
+  /** Convert to an auto_ptr_ref.  This is used when a function
+      returning an auto_ptr is the argument to the constructor of
+      another auto_ptr.  */
+  template <class Y>
+  operator detail::auto_ptr_ref<Y>() throw()
+  {
+    return detail::auto_ptr_ref<Y>(this->release(), 1);
+  }
+#endif
+};
+
+} // namespace cm
+
+// Undo warning suppression.
+#if defined(__clang__) && defined(__has_warning)
+#if __has_warning("-Wdeprecated")
+#pragma clang diagnostic pop
+#endif
+#endif
+
+#endif