74 lines
2.7 KiB
C++
74 lines
2.7 KiB
C++
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// Copyright 2010 Google Inc.
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of Google Inc. nor the names of its contributors
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// may be used to endorse or promote products derived from this software
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// without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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/// \file utils/noncopyable.hpp
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/// Provides the utils::noncopyable class.
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///
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/// The class is provided as a separate module on its own to minimize
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/// header-inclusion side-effects.
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#if !defined(UTILS_NONCOPYABLE_HPP)
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#define UTILS_NONCOPYABLE_HPP
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namespace utils {
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/// Forbids copying a class at compile-time.
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///
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/// Inheriting from this class delivers a private copy constructor and an
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/// assignment operator that effectively forbid copying the class during
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/// compilation.
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///
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/// Always use private inheritance.
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class noncopyable {
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/// Data placeholder.
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///
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/// The class cannot be empty; otherwise we get ABI-stability warnings
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/// during the build, which will break it due to strict checking.
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int _noncopyable_dummy;
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/// Private copy constructor to deny copying of subclasses.
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noncopyable(const noncopyable&);
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/// Private assignment constructor to deny copying of subclasses.
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noncopyable& operator=(const noncopyable&);
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protected:
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// Explicitly needed to provide some non-private functions. Otherwise
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// we also get some warnings during the build.
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noncopyable(void) {}
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~noncopyable(void) {}
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};
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} // namespace utils
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#endif // !defined(UTILS_NONCOPYABLE_HPP)
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