Fix QxtFifo and move qxtweb modules in their respective folder

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

@@ -0,0 +1,152 @@
+
+/****************************************************************************
+** Copyright (c) 2006 - 2011, the LibQxt project.
+** See the Qxt AUTHORS file for a list of authors and copyright holders.
+** All rights reserved.
+**
+** Redistribution and use in source and binary forms, with or without
+** modification, are permitted provided that the following conditions are met:
+**     * Redistributions of source code must retain the above copyright
+**       notice, this list of conditions and the following disclaimer.
+**     * Redistributions in binary form must reproduce the above copyright
+**       notice, this list of conditions and the following disclaimer in the
+**       documentation and/or other materials provided with the distribution.
+**     * Neither the name of the LibQxt project nor the
+**       names of its contributors may be used to endorse or promote products
+**       derived from this software without specific prior written permission.
+**
+** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+** ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+** WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+** DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
+** DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+** (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+** LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+** ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+** SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+**
+** <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