v01

thirdparty/Pangolin/include/pangolin/var/varwrapper.h

@@ -0,0 +1,91 @@
+/* This file is part of the Pangolin Project.
+ * http://github.com/stevenlovegrove/Pangolin
+ *
+ * Copyright (c) 2014 Steven Lovegrove
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use,
+ * copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following
+ * conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
+ * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
+ * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
+ * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#pragma once
+
+#include <pangolin/var/varvaluegeneric.h>
+#include <pangolin/compat/type_traits.h>
+#include <pangolin/utils/type_convert.h>
+
+namespace pangolin
+{
+
+template<typename T, typename S>
+class VarWrapper : public VarValueT<T>
+{
+public:
+    typedef typename std::remove_reference<S>::type VarS;
+
+    VarWrapper(VarValueT<S>& src)
+        : src(src)
+    {
+        this->str = src.str;
+    }
+
+    const char* TypeId() const
+    {
+        return typeid(T).name();
+    }
+
+    void Reset()
+    {
+        src.Reset();
+
+        // If reset throws, it will go up to the user, since there is nothing
+        // more we can do
+        cache = Convert<T,VarS>::Do(src.Get());
+    }
+
+    VarMeta& Meta()
+    {
+        return src.Meta();
+    }
+
+    const T& Get() const
+    {
+        // This might throw, but we can't reset because this is a const method
+        cache = Convert<T,VarS>::Do(src.Get());
+        return cache;
+    }
+
+    void Set(const T& val)
+    {
+        cache = val;
+        try {
+            src.Set( Convert<VarS, T>::Do(val) );
+        }catch(const BadInputException&) {
+            pango_print_warn("Unable to set variable with type %s from %s. Resetting.", typeid(VarS).name(), typeid(T).name() );
+            Reset();
+        }
+    }
+
+protected:
+    mutable T cache;
+    VarValueT<S>& src;
+};
+
+}