1 /* 2 * Copyright (C) 2008 Vaclav Slavik (vslavik@fastmail.fm) 3 * All Rights Reserved 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in 13 * the documentation and/or other materials provided with the 14 * distribution. 15 * 3. Neither the name of the Author nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' 20 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A 22 * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR 23 * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 25 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 26 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 27 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 28 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 29 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33 /* 34 * $Id: pimpl_base.hpp 154446 2009-03-11 17:11:29Z satskyse $ 35 * NOTE: This file was modified from its original version 0.6.0 36 * to fit the NCBI C++ Toolkit build framework and 37 * API and functionality requirements. 38 */ 39 40 #ifndef _xmlwrapp_pimpl_base_h_ 41 #define _xmlwrapp_pimpl_base_h_ 42 43 #ifdef HAVE_BOOST_POOL_SINGLETON_POOL_HPP 44 #include <cassert> 45 #include <boost/pool/singleton_pool.hpp> 46 #endif // HAVE_BOOST_POOL_SINGLETON_POOL_HPP 47 48 namespace xml 49 { 50 51 namespace impl 52 { 53 54 // Base class for all pimpl classes. Uses custom pool allocator for better 55 // performance. Usage: derive your class FooImpl from pimpl_base<FooImpl>. 56 template<typename T> 57 class pimpl_base 58 { 59 #ifdef HAVE_BOOST_POOL_SINGLETON_POOL_HPP 60 public: 61 struct xmlwrapp_pool_tag {}; 62 63 // NB: we can't typedef the pool type as pimpl_base<T> subtype, 64 // because sizeof(T) is unknown (incomplete type) at this point, 65 // but it's OK to use the type in implementation of operators 66 // (compiled only when T, and so sizeof(T), is known) 67 #define XMLWRAPP_PIMPL_ALLOCATOR_TYPE(T) \ 68 boost::singleton_pool<xmlwrapp_pool_tag, sizeof(T)> 69 operator new(size_t size)70 static void* operator new(size_t size) 71 { 72 assert( size == sizeof(T) ); 73 return XMLWRAPP_PIMPL_ALLOCATOR_TYPE(T)::malloc(); 74 } 75 operator delete(void * ptr,size_t size)76 static void operator delete(void *ptr, size_t size) 77 { 78 assert( size == sizeof(T) ); 79 if ( ptr ) 80 XMLWRAPP_PIMPL_ALLOCATOR_TYPE(T)::free(ptr); 81 } 82 #endif // HAVE_BOOST_POOL_SINGLETON_POOL_HPP 83 }; 84 85 } // namespace impl 86 87 } // namespace xml 88 89 #endif // _xmlwrapp_pimpl_base_h_ 90