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[wxWidgets.git] / interface / wx / scopeguard.h

diff --git a/interface/wx/scopeguard.h b/interface/wx/scopeguard.h
index e8c88a7989e95af1c31467fe034632de83a26742..06769cc7e3d739a40f453aab046c9598fe59b6db 100644 (file)
--- a/interface/wx/scopeguard.h
+++ b/interface/wx/scopeguard.h
@@ -3,16 +3,66 @@
 // Purpose:     interface of global functions
 // Author:      wxWidgets team
 // RCS-ID:      $Id$
-// Licence:     wxWindows license
+// Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-/** @ingroup group_funcmacro_misc */
+/**
+    @class wxScopeGuard
+
+    Scope guard is an object which allows executing an action on scope exit.
+
+    The objects of this class must be constructed using wxMakeGuard() function.
+
+    @nolibrary
+    @category{misc}
+ */
+class wxScopeGuard
+{
+public:
+    /**
+        Call this method to dismiss the execution of the action on scope exit.
+
+        A typical example:
+        @code
+            Update1();
+
+            // ensure that changes done so far are rolled back if the next
+            // operation throws
+            wxScopeGuard guard = wxMakeGuard(RollBack);
+            Update2();
+
+            // it didn't throw so commit the changes, i.e. avoid rolling back
+            guard.Dismiss();
+        @endcode
+     */
+    void Dismiss();
+};
+
+/** @addtogroup group_funcmacro_misc */
 //@{
 /**
-    This macro ensures that the global @a function with 0, 1, 2 or more
-    parameters (up to some implementation-defined limit) is executed on scope
-    exit, whether due to a normal function return or because an exception has
-    been thrown. A typical example of its usage:
+    Returns a scope guard object which will call the specified function with
+    the given parameters on scope exit.
+
+    This function is overloaded to take several parameters up to some
+    implementation-defined (but relatively low) limit.
+
+    The @a func should be a functor taking parameters of the types P1, ..., PN,
+    i.e. the expression @c func(p1, ..., pN) should be valid.
+ */
+template <typename F, typename P1, ..., typename PN>
+wxScopeGuard wxMakeGuard(F func, P1 p1, ..., PN pN);
+
+//@}
+
+/** @addtogroup group_funcmacro_misc */
+//@{
+/**
+    Ensure that the global @a function with a few (up to some
+    implementation-defined limit) is executed on scope exit, whether due to a
+    normal function return or because an exception has been thrown.
+
+    A typical example of its usage:
 
     @code
     void *buf = malloc(size);
@@ -26,38 +76,44 @@
 
     @header{wx/scopeguard.h}
 */
+#define wxON_BLOCK_EXIT(function, ...)
 #define wxON_BLOCK_EXIT0(function)
 #define wxON_BLOCK_EXIT1(function, p1)
 #define wxON_BLOCK_EXIT2(function, p1, p2)
+#define wxON_BLOCK_EXIT3(function, p1, p2, p3)
 //@}
 
-/** @ingroup group_funcmacro_misc */
+/** @addtogroup group_funcmacro_misc */
 //@{
 /**
-    This family of macros is similar to wxON_BLOCK_EXIT0(), but calls a method
+    This family of macros is similar to wxON_BLOCK_EXIT(), but calls a method
     of the given object instead of a free function.
 
     @header{wx/scopeguard.h}
 */
+#define wxON_BLOCK_EXIT_OBJ(object, method, ...)
 #define wxON_BLOCK_EXIT_OBJ0(object, method)
 #define wxON_BLOCK_EXIT_OBJ1(object, method, p1)
 #define wxON_BLOCK_EXIT_OBJ2(object, method, p1, p2)
+#define wxON_BLOCK_EXIT_OBJ3(object, method, p1, p2, p3)
 //@}
 
-/** @ingroup group_funcmacro_misc */
+/** @addtogroup group_funcmacro_misc */
 //@{
 /**
-    This family of macros is similar to wxON_BLOCK_OBJ0(), but calls a method
+    This family of macros is similar to wxON_BLOCK_OBJ(), but calls a method
     of @c this object instead of a method of the specified object.
 
     @header{wx/scopeguard.h}
 */
+#define wxON_BLOCK_EXIT_THIS(method, ...)
 #define wxON_BLOCK_EXIT_THIS0(method)
 #define wxON_BLOCK_EXIT_THIS1(method, p1)
 #define wxON_BLOCK_EXIT_THIS2(method, p1, p2)
+#define wxON_BLOCK_EXIT_THIS3(method, p1, p2, p3)
 //@}
 
-/** @ingroup group_funcmacro_misc */
+/** @addtogroup group_funcmacro_misc */
 //@{
 /**
     This macro sets a variable to the specified value on scope exit.
@@ -75,6 +131,9 @@
     }
     @endcode
 
+    Notice that @a value is copied, i.e. stored by value, so it can be a
+    temporary object returned by a function call, for example.
+
     @see wxON_BLOCK_EXIT_OBJ0(), wxON_BLOCK_EXIT_NULL()
 
     @header{wx/scopeguard.h}