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+// Copyright 2010 The Kyua Authors.
+// 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 Google Inc. 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 THE COPYRIGHT
+// OWNER OR CONTRIBUTORS 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.
+
+/// \file utils/noncopyable.hpp
+/// Provides the utils::noncopyable class.
+///
+/// The class is provided as a separate module on its own to minimize
+/// header-inclusion side-effects.
+
+#if !defined(UTILS_NONCOPYABLE_HPP)
+#define UTILS_NONCOPYABLE_HPP
+
+
+namespace utils {
+
+
+/// Forbids copying a class at compile-time.
+///
+/// Inheriting from this class delivers a private copy constructor and an
+/// assignment operator that effectively forbid copying the class during
+/// compilation.
+///
+/// Always use private inheritance.
+class noncopyable {
+ /// Data placeholder.
+ ///
+ /// The class cannot be empty; otherwise we get ABI-stability warnings
+ /// during the build, which will break it due to strict checking.
+ int _noncopyable_dummy;
+
+ /// Private copy constructor to deny copying of subclasses.
+ noncopyable(const noncopyable&);
+
+ /// Private assignment constructor to deny copying of subclasses.
+ ///
+ /// \return A reference to the object.
+ noncopyable& operator=(const noncopyable&);
+
+protected:
+ // Explicitly needed to provide some non-private functions. Otherwise
+ // we also get some warnings during the build.
+ noncopyable(void) {}
+ ~noncopyable(void) {}
+};
+
+
+} // namespace utils
+
+
+#endif // !defined(UTILS_NONCOPYABLE_HPP)