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+/*
+ * Copyright (C) 2012-2016 Robin Haberkorn
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program 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, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef __MEMORY_H
+#define __MEMORY_H
+
+#include <glib.h>
+
+/**
+ * Default memory limit (500mb, assuming SI units).
+ */
+#define MEMORY_LIMIT_DEFAULT (500*1000*1000)
+
+namespace SciTECO {
+
+/**
+ * Common base class for all objects in SciTECO.
+ * This is currently only used to provide custom new/delete
+ * replacements in order to support unified allocation via
+ * Glib (g_malloc and g_slice) and as a memory usage
+ * counting fallback.
+ *
+ * This approach has certain drawbacks, e.g. you cannot
+ * derive from Object privately; nor is it possible to
+ * influence allocations in other libraries or even of
+ * scalars (e.g. new char[5]).
+ *
+ * C++14 (supported by GCC >= 5) has global sized delete
+ * replacements which would be effective in the entire application
+ * but we're still using the base-class approach since
+ * we must support the older compilers anyway.
+ */
+class Object {
+public:
+	static void *operator new(size_t size) noexcept;
+	static inline void *
+	operator new[](size_t size) noexcept
+	{
+		return operator new(size);
+	}
+	static inline void *
+	operator new(size_t size, void *ptr) noexcept
+	{
+		return ptr;
+	}
+
+	static void operator delete(void *ptr, size_t size) noexcept;
+	static inline void
+	operator delete[](void *ptr, size_t size) noexcept
+	{
+		operator delete(ptr, size);
+	}
+};
+
+extern class MemoryLimit : public Object {
+public:
+	/**
+	 * Undo stack memory limit in bytes.
+	 * 0 means no limiting.
+	 */
+	gsize limit;
+
+	MemoryLimit() : limit(MEMORY_LIMIT_DEFAULT) {}
+
+	gsize get_usage(void);
+
+	void set_limit(gsize new_limit = 0);
+
+	void check(void);
+} memlimit;
+
+} /* namespace SciTECO */
+
+#endif