1*11be35a1SLionel Sambuc // Copyright 2010 Google Inc. 2*11be35a1SLionel Sambuc // All rights reserved. 3*11be35a1SLionel Sambuc // 4*11be35a1SLionel Sambuc // Redistribution and use in source and binary forms, with or without 5*11be35a1SLionel Sambuc // modification, are permitted provided that the following conditions are 6*11be35a1SLionel Sambuc // met: 7*11be35a1SLionel Sambuc // 8*11be35a1SLionel Sambuc // * Redistributions of source code must retain the above copyright 9*11be35a1SLionel Sambuc // notice, this list of conditions and the following disclaimer. 10*11be35a1SLionel Sambuc // * Redistributions in binary form must reproduce the above copyright 11*11be35a1SLionel Sambuc // notice, this list of conditions and the following disclaimer in the 12*11be35a1SLionel Sambuc // documentation and/or other materials provided with the distribution. 13*11be35a1SLionel Sambuc // * Neither the name of Google Inc. nor the names of its contributors 14*11be35a1SLionel Sambuc // may be used to endorse or promote products derived from this software 15*11be35a1SLionel Sambuc // without specific prior written permission. 16*11be35a1SLionel Sambuc // 17*11be35a1SLionel Sambuc // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 18*11be35a1SLionel Sambuc // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 19*11be35a1SLionel Sambuc // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 20*11be35a1SLionel Sambuc // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 21*11be35a1SLionel Sambuc // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 22*11be35a1SLionel Sambuc // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 23*11be35a1SLionel Sambuc // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 24*11be35a1SLionel Sambuc // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 25*11be35a1SLionel Sambuc // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 26*11be35a1SLionel Sambuc // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 27*11be35a1SLionel Sambuc // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 28*11be35a1SLionel Sambuc 29*11be35a1SLionel Sambuc /// \file utils/noncopyable.hpp 30*11be35a1SLionel Sambuc /// Provides the utils::noncopyable class. 31*11be35a1SLionel Sambuc /// 32*11be35a1SLionel Sambuc /// The class is provided as a separate module on its own to minimize 33*11be35a1SLionel Sambuc /// header-inclusion side-effects. 34*11be35a1SLionel Sambuc 35*11be35a1SLionel Sambuc #if !defined(UTILS_NONCOPYABLE_HPP) 36*11be35a1SLionel Sambuc #define UTILS_NONCOPYABLE_HPP 37*11be35a1SLionel Sambuc 38*11be35a1SLionel Sambuc 39*11be35a1SLionel Sambuc namespace utils { 40*11be35a1SLionel Sambuc 41*11be35a1SLionel Sambuc 42*11be35a1SLionel Sambuc /// Forbids copying a class at compile-time. 43*11be35a1SLionel Sambuc /// 44*11be35a1SLionel Sambuc /// Inheriting from this class delivers a private copy constructor and an 45*11be35a1SLionel Sambuc /// assignment operator that effectively forbid copying the class during 46*11be35a1SLionel Sambuc /// compilation. 47*11be35a1SLionel Sambuc /// 48*11be35a1SLionel Sambuc /// Always use private inheritance. 49*11be35a1SLionel Sambuc class noncopyable { 50*11be35a1SLionel Sambuc /// Data placeholder. 51*11be35a1SLionel Sambuc /// 52*11be35a1SLionel Sambuc /// The class cannot be empty; otherwise we get ABI-stability warnings 53*11be35a1SLionel Sambuc /// during the build, which will break it due to strict checking. 54*11be35a1SLionel Sambuc int _noncopyable_dummy; 55*11be35a1SLionel Sambuc 56*11be35a1SLionel Sambuc /// Private copy constructor to deny copying of subclasses. 57*11be35a1SLionel Sambuc noncopyable(const noncopyable&); 58*11be35a1SLionel Sambuc 59*11be35a1SLionel Sambuc /// Private assignment constructor to deny copying of subclasses. 60*11be35a1SLionel Sambuc noncopyable& operator=(const noncopyable&); 61*11be35a1SLionel Sambuc 62*11be35a1SLionel Sambuc protected: 63*11be35a1SLionel Sambuc // Explicitly needed to provide some non-private functions. Otherwise 64*11be35a1SLionel Sambuc // we also get some warnings during the build. noncopyable(void)65*11be35a1SLionel Sambuc noncopyable(void) {} ~noncopyable(void)66*11be35a1SLionel Sambuc ~noncopyable(void) {} 67*11be35a1SLionel Sambuc }; 68*11be35a1SLionel Sambuc 69*11be35a1SLionel Sambuc 70*11be35a1SLionel Sambuc } // namespace utils 71*11be35a1SLionel Sambuc 72*11be35a1SLionel Sambuc 73*11be35a1SLionel Sambuc #endif // !defined(UTILS_NONCOPYABLE_HPP) 74