summaryrefslogtreecommitdiffstats
path: root/indexlib/memreference.h
diff options
context:
space:
mode:
Diffstat (limited to 'indexlib/memreference.h')
-rw-r--r--indexlib/memreference.h118
1 files changed, 118 insertions, 0 deletions
diff --git a/indexlib/memreference.h b/indexlib/memreference.h
new file mode 100644
index 000000000..32c55e75c
--- /dev/null
+++ b/indexlib/memreference.h
@@ -0,0 +1,118 @@
+#ifndef LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_
+#define LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_
+
+/* This file is part of indexlib.
+ * Copyright (C) 2005 Luís Pedro Coelho <luis@luispedro.org>
+ *
+ * Indexlib is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation and available as file
+ * GPL_V2 which is distributed along with indexlib.
+ *
+ * Indexlib is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA
+ *
+ * In addition, as a special exception, the copyright holders give
+ * permission to link the code of this program with any edition of
+ * the Qt library by Trolltech AS, Norway (or with modified versions
+ * of Qt that use the same license as Qt), and distribute linked
+ * combinations including the two. You must obey the GNU General
+ * Public License in all respects for all of the code used other than
+ * Qt. If you modify this file, you may extend this exception to
+ * your version of the file, but you are not obligated to do so. If
+ * you do not wish to do so, delete this exception statement from
+ * your version.
+ */
+
+
+#include "bitio.h"
+
+/**
+ * Works like a reference to a memory location
+ * which is written and read in our byte-format.
+ */
+template <typename T>
+struct memory_reference {
+ public:
+ explicit memory_reference( unsigned char* d ):
+ data_( d )
+ {
+ }
+ ~memory_reference() { }
+ memory_reference& operator = ( const memory_reference& other ) {
+ operator=( T( other ) );
+ return *this;
+ }
+ memory_reference& operator = ( const T& value ) {
+ byte_io::write<T>( data_, value );
+ return *this;
+ }
+ operator T () const {
+ return byte_io::read<T>( data_ );
+ }
+ memory_reference( const memory_reference& other ):
+ data_( other.data_ )
+ {
+ }
+ /**
+ * This is a sneaky method to change pointers
+ */
+ void assign( const memory_reference& other ) {
+ data_ = other.data_;
+ }
+ private:
+ unsigned char* data_;
+};
+
+
+// A mixed and fairly random collection of helper functions
+
+template <typename T, typename U>
+memory_reference<T> operator += ( memory_reference<T> ref, U v ) {
+ return ref = ref + v;
+}
+
+template <typename T>
+memory_reference<T> operator ++( memory_reference<T> ref ) {
+ return ref = ref + 1;
+}
+
+template <typename T>
+memory_reference<T> operator --( memory_reference<T> ref ) {
+ return ref = ref - 1;
+}
+
+template <typename T>
+T operator ++( memory_reference<T> ref, int ) {
+ T v = ref;
+ ref = ref + 1;
+ return v;
+}
+
+template <typename T>
+T operator --( memory_reference<T> ref, int ) {
+ T v = ref;
+ ref = ref - 1;
+ return v;
+}
+
+template <typename T, typename U>
+memory_reference<T> operator -= ( memory_reference<T> ref, U v ) {
+ return ref = ref - v;
+}
+
+template <typename T, typename U>
+memory_reference<T> operator *= ( memory_reference<T> ref, U v ) {
+ return ref = ref * v;
+}
+
+
+
+#endif /* LPC_MEMREFERENCE_H1108569807_INCLUDE_GUARD_ */