1// Copyright 2010 The Kyua Authors. 2// All rights reserved. 3// 4// Redistribution and use in source and binary forms, with or without 5// modification, are permitted provided that the following conditions are 6// met: 7// 8// * Redistributions of source code must retain the above copyright 9// notice, this list of conditions and the following disclaimer. 10// * Redistributions in binary form must reproduce the above copyright 11// notice, this list of conditions and the following disclaimer in the 12// documentation and/or other materials provided with the distribution. 13// * Neither the name of Google Inc. nor the names of its contributors 14// may be used to endorse or promote products derived from this software 15// without specific prior written permission. 16// 17// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28 29/// \file utils/noncopyable.hpp 30/// Provides the utils::noncopyable class. 31/// 32/// The class is provided as a separate module on its own to minimize 33/// header-inclusion side-effects. 34 35#if !defined(UTILS_NONCOPYABLE_HPP) 36#define UTILS_NONCOPYABLE_HPP 37 38 39namespace utils { 40 41 42/// Forbids copying a class at compile-time. 43/// 44/// Inheriting from this class delivers a private copy constructor and an 45/// assignment operator that effectively forbid copying the class during 46/// compilation. 47/// 48/// Always use private inheritance. 49class noncopyable { 50 /// Data placeholder. 51 /// 52 /// The class cannot be empty; otherwise we get ABI-stability warnings 53 /// during the build, which will break it due to strict checking. 54 int _noncopyable_dummy; 55 56 /// Private copy constructor to deny copying of subclasses. 57 noncopyable(const noncopyable&); 58 59 /// Private assignment constructor to deny copying of subclasses. 60 /// 61 /// \return A reference to the object. 62 noncopyable& operator=(const noncopyable&); 63 64protected: 65 // Explicitly needed to provide some non-private functions. Otherwise 66 // we also get some warnings during the build. 67 noncopyable(void) {} 68 ~noncopyable(void) {} 69}; 70 71 72} // namespace utils 73 74 75#endif // !defined(UTILS_NONCOPYABLE_HPP) 76