renamed wx/ptr_shrd.h to wx/sharedptr.h; split wx/ptr_scpd.h in wx/scopedptr.h and wx/scopedarray.h; extracted common parts into new wx/checkeddelete.h

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@58634 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

interface/wx/scopedarray.h

@@ -0,0 +1,172 @@
+/////////////////////////////////////////////////////////////////////////////
+// Name:        wx/scopedarray.h
+// Purpose:     interface of wxScopedArray
+// Author:      wxWidgets team
+// RCS-ID:      $Id$
+// Licence:     wxWindows license
+/////////////////////////////////////////////////////////////////////////////
+
+/**
+    @class wxScopedArray
+
+    This is a simple scoped smart pointer array implementation that is similar to
+    the Boost smart pointers (see http://www.boost.org/) but rewritten to
+    use macros instead.
+
+    @b Example:
+
+    Below is an example of using a wxWidgets scoped smart pointer and pointer array.
+
+    @code
+    class MyClass { ... };
+
+    // declare a smart pointer to a MyClass called wxMyClassPtr
+    wxDECLARE_SCOPED_PTR(MyClass, wxMyClassPtr)
+    // declare a smart pointer to an array of chars
+    wxDECLARE_SCOPED_ARRAY(char, wxCharArray)
+
+    ...
+
+    // define the first pointer class, must be complete
+    wxDEFINE_SCOPED_PTR(MyClass, wxMyClassPtr)
+    // define the second pointer class
+    wxDEFINE_SCOPED_ARRAY(char, wxCharArray)
+
+    // create an object with a new pointer to MyClass
+    wxMyClassPtr theObj(new MyClass());
+    // reset the pointer (deletes the previous one)
+    theObj.reset(new MyClass());
+
+    // access the pointer
+    theObj->MyFunc();
+
+    // create an object with a new array of chars
+    wxCharArray theCharObj(new char[100]);
+
+    // access the array
+    theCharObj[0] = "!";
+    @endcode
+
+    <b>Declaring new smart pointer types:</b>
+    @code
+    wxDECLAR_SCOPED_ARRAY( TYPE,        // type of the values
+                           CLASSNAME ); // name of the class
+    @endcode
+
+    A smart pointer holds a pointer to an object (which must be complete when
+    wxDEFINE_SCOPED_ARRAY() is called).
+
+    The memory used by the object is deleted when the smart pointer goes out of
+    scope. The first argument of the macro is the pointer type, the second is the
+    name of the new smart pointer class being created. Below we will use wxScopedArray
+    to represent the scoped pointer array class, but the user may create the class with
+    any legal name.
+
+    @library{wxbase}
+    @category{smartpointers}
+
+    @see wxScopedPtr
+*/
+class wxScopedArray
+{
+public:
+    /**
+        Creates the smart pointer with the given pointer or none if @NULL.  On
+        compilers that support it, this uses the explicit keyword.
+    */
+    wxScopedArray(type*  T = NULL);
+
+    /**
+        This operator gets the pointer stored in the smart pointer or returns @NULL if
+        there is none.
+    */
+    const T* get();
+
+    /**
+        This operator acts like the standard [] indexing operator for C++ arrays.  The
+        function does not do bounds checking.
+    */
+    const T& operator [](long int i);
+
+    /**
+        Deletes the currently held pointer and sets it to 'p' or to @NULL if no
+        arguments are specified. This function does check to make sure that the
+        pointer you are assigning is not the same pointer that is already stored.
+    */
+    reset(T* p  = NULL);
+
+    /**
+        Swap the pointer inside the smart pointer with @a ot. The pointer being swapped
+        must be of the same type (hence the same class name).
+    */
+    swap(wxScopedArray& ot);
+};
+
+/**
+    A scoped array template class.
+
+    This class is similar to boost scoped_array class:
+    http://www.boost.org/doc/libs/1_37_0/libs/smart_ptr/scoped_array.htm
+
+    Notice that objects of this class intentionally cannot be copied.
+
+    @library{wxbase}
+    @category{smartpointers}
+ */
+template <class T>
+class wxScopedArray
+{
+public:
+    /// The type of the array elements.
+    typedef T element_type;
+
+    /**
+        Constructor takes ownership of the given array.
+
+        If @a array is @NULL, reset() must presumably be called later.
+
+        @param array
+            An array allocated using @c new[] or @NULL.
+     */
+    explicit wxScopedArray(T * array = NULL);
+
+    /// Destructor destroy the array.
+    ~wxScopedArray();
+
+    /**
+        Conversion to a boolean expression (in a variant which is not
+        convertible to anything but a boolean expression).
+
+        If this class contains a valid array it will return @true, if it contains
+        a @NULL pointer it will return @false.
+    */
+    operator unspecified_bool_type() const;
+
+    /**
+        Change the array pointer stored.
+
+        The previously stored array is deleted.
+
+        @param array
+            An array allocated using @c new[] or @NULL.
+     */
+    void reset(T *array = NULL);
+
+    /**
+        Return the n-th element of the array.
+
+        Must not be called if the array has no valid pointer.
+     */
+    T& operator[](size_t n) const;
+
+    /**
+        Return the array pointer.
+
+        The returned pointer may be @NULL. It must not be deleted by the
+        caller, call @c reset(NULL) instead.
+     */
+    T *get() const;
+
+    /// Swaps the contents of this array with another one.
+    void swap(wxScopedArray &other);
+};