1 files changed, 58 insertions, 0 deletions
diff --git a/doc/codesnippets/doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp b/doc/codesnippets/doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp
new file mode 100644
index 000000000..36f7491ee
--- /dev/null
+++ b/doc/codesnippets/doc/src/snippets/code/src_qt3support_tools_q3deepcopy.cpp
@@ -0,0 +1,58 @@
+//! [0]
+// all 5 strings share the same data
+QString s1 = "abcd";
+QString s2 = s1;
+QString s3 = s2;
+QString s4 = s3;
+QString s5 = s2;
+//! [0]
+
+
+//! [1]
+// s1, s2 and s5 share the same data, neither s3 nor s4 are shared
+QString s1 = "abcd";
+QString s2 = s1;
+Q3DeepCopy<QString> s3 = s2;  // s3 is a deep copy of s2
+QString s4 = s3;             // s4 is a deep copy of s3
+QString s5 = s2;
+//! [1]
+
+
+//! [2]
+// s1, s2 and s5 share the same data, s3 and s4 share the same data
+QString s1 = "abcd";
+QString s2 = s1;
+QString s3 = Q3DeepCopy<QString>( s2 );  // s3 is a deep copy of s2
+QString s4 = s3;                        // s4 is a shallow copy of s3
+QString s5 = s2;
+//! [2]
+
+
+//! [3]
+Q3DeepCopy<QString> global_string;  // global string data
+QMutex global_mutex;               // mutex to protext global_string
+
+...
+
+void setGlobalString( const QString &str )
+{
+    global_mutex.lock();
+    global_string = str;           // global_string is a deep copy of str
+    global_mutex.unlock();
+}
+
+...
+
+void MyThread::run()
+{
+    global_mutex.lock();
+    QString str = global_string;          // str is a deep copy of global_string
+    global_mutex.unlock();
+
+    // process the string data
+    ...
+
+    // update global_string
+    setGlobalString( str );
+}
+//! [3]