Move rtaudio, alsa-playback and qxt into thirdparty/.

thirdparty/qxt/qxtweb-standalone/qxtweb/qxtnullable.h

@@ -0,0 +1,146 @@
+/****************************************************************************
+ **
+ ** Copyright (C) Qxt Foundation. Some rights reserved.
+ **
+ ** This file is part of the QxtCore module of the Qxt library.
+ **
+ ** This library is free software; you can redistribute it and/or modify it
+ ** under the terms of the Common Public License, version 1.0, as published
+ ** by IBM, and/or under the terms of the GNU Lesser General Public License,
+ ** version 2.1, as published by the Free Software Foundation.
+ **
+ ** This file is provided "AS IS", without WARRANTIES OR CONDITIONS OF ANY
+ ** KIND, EITHER EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY
+ ** WARRANTIES OR CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR
+ ** FITNESS FOR A PARTICULAR PURPOSE.
+ **
+ ** You should have received a copy of the CPL and the LGPL along with this
+ ** file. See the LICENSE file and the cpl1.0.txt/lgpl-2.1.txt files
+ ** included with the source distribution for more information.
+ ** If you did not receive a copy of the licenses, contact the Qxt Foundation.
+ **
+ ** <http://libqxt.org>  <foundation@libqxt.org>
+ **
+ ****************************************************************************/
+
+/*!
+\class QxtNullable QxtNullable
+\inmodule QxtCore
+\brief distinct null value compatible with any data type.
+
+in general it's a templated abstraction to allow any data type to be
+expressed with a null value distinct from any real value. An example
+of such a use is for optional arguments.
+\n
+prepare a function for argument skipping:
+
+\code
+void  somefunction( qxtNull(int,a) , qxtNull(int,b) )
+{
+
+if (!a.isNull())
+ {
+ int i = a.value();
+ //do something with i
+ }
+ if (!b.isNull())
+ {
+ int x = b.value();
+ //do something with x
+ }
+}
+\endcode
+
+usage:
+\code
+
+somefunction(SKIP,1,2);
+somefunction(3,4);
+somefunction(3,SKIP,6);
+somefunction(1);
+\endcode
+
+*/
+
+#ifndef QXTNULLABLE_H
+#define QXTNULLABLE_H
+#include <qxtglobal.h>
+
+/*! \relates QxtNullable
+ * defines a skipable argument with type \a t and variable name \a n
+ */
+#define qxtNull(t,n)   QxtNullable<t> n = QxtNullable<t>()
+
+#include <qxtnull.h>
+
+template<typename T>
+class /*QXT_CORE_EXPORT*/ QxtNullable
+{
+public:
+    QxtNullable(QxtNull);
+    QxtNullable(const T& p);
+    QxtNullable();
+
+    ///determinates if the Value is set to something meaningfull
+    bool isNull() const;
+
+    ///delete Value
+    void nullify();
+
+    T& value() const;
+    operator T() const;
+    void operator=(const T& p);
+
+private:
+    T* val;
+};
+
+template<typename T>
+QxtNullable<T>::QxtNullable(QxtNull)
+{
+    val = 0;
+}
+
+template<typename T>
+QxtNullable<T>::QxtNullable(const T& p)
+{
+    val = const_cast<T*>(&p);
+}
+
+template<typename T>
+QxtNullable<T>::QxtNullable()
+{
+    val = 0;
+}
+
+template<typename T>
+QxtNullable<T>::operator T() const
+{
+    return *val;
+}
+
+template<typename T>
+T& QxtNullable<T>::value() const
+{
+    return *val;
+}
+
+template<typename T>
+bool QxtNullable<T>::isNull() const
+{
+    return (val == 0);
+}
+
+template<typename T>
+void QxtNullable<T>::nullify()
+{
+    val = 0;
+}
+
+template<typename T>
+void QxtNullable<T>::operator=(const T & p)
+{
+    val = const_cast<T*>(&p);
+}
+
+#endif