+++ /dev/null
-// Baruch Even baruch@ev-en.org 2001-02-20
-// This version is a modified version for use in LyX
-// The modifications are done in order to use it where exceptions are disabled
-// Currently it has no "no memory" checks in place, asserts are probably the
-// only real way.
-// all changed are #ifded'ed by LYX_NO_EXCEPTIONS
-#define LYX_NO_EXCEPTIONS
-
-// Boost smart_ptr.hpp header file -----------------------------------------//
-
-// (C) Copyright Greg Colvin and Beman Dawes 1998, 1999. Permission to copy,
-// use, modify, sell and distribute this software is granted provided this
-// copyright notice appears in all copies. This software is provided "as is"
-// without express or implied warranty, and with no claim as to its
-// suitability for any purpose.
-
-// See http://www.boost.org for most recent version including documentation.
-
-// Revision History
-// 21 May 01 Require complete type where incomplete type is unsafe.
-// (suggested by Vladimir Prus)
-// 21 May 01 operator= fails if operand transitively owned by *this, as in a
-// linked list (report by Ken Johnson, fix by Beman Dawes)
-// 21 Jan 01 Suppress some useless warnings with MSVC (David Abrahams)
-// 19 Oct 00 Make shared_ptr ctor from auto_ptr explicit. (Robert Vugts)
-// 24 Jul 00 Change throw() to // never throws. See lib guidelines
-// Exception-specification rationale. (Beman Dawes)
-// 22 Jun 00 Remove #if continuations to fix GCC 2.95.2 problem (Beman Dawes)
-// 1 Feb 00 Additional shared_ptr BOOST_NO_MEMBER_TEMPLATES workarounds
-// (Dave Abrahams)
-// 31 Dec 99 Condition tightened for no member template friend workaround
-// (Dave Abrahams)
-// 30 Dec 99 Moved BOOST_NMEMBER_TEMPLATES compatibility code to config.hpp
-// (Dave Abrahams)
-// 30 Nov 99 added operator ==, operator !=, and std::swap and std::less
-// specializations for shared types (Darin Adler)
-// 11 Oct 99 replaced op[](int) with op[](std::size_t) (Ed Brey, Valentin
-// Bonnard), added shared_ptr workaround for no member template
-// friends (Matthew Langston)
-// 25 Sep 99 added shared_ptr::swap and shared_array::swap (Luis Coelho).
-// 20 Jul 99 changed name to smart_ptr.hpp, #include <boost/config.hpp>,
-// #include <boost/utility.hpp> and use boost::noncopyable
-// 17 May 99 remove scoped_array and shared_array operator*() as
-// unnecessary (Beman Dawes)
-// 14 May 99 reorder code so no effects when bad_alloc thrown (Abrahams/Dawes)
-// 13 May 99 remove certain throw() specifiers to avoid generated try/catch
-// code cost (Beman Dawes)
-// 11 May 99 get() added, conversion to T* placed in macro guard (Valentin
-// Bonnard, Dave Abrahams, and others argued for elimination
-// of the automatic conversion)
-// 28 Apr 99 #include <memory> fix (Valentin Bonnard)
-// 28 Apr 99 rename transfer() to share() for clarity (Dave Abrahams)
-// 28 Apr 99 remove unsafe shared_array template conversions(Valentin Bonnard)
-// 28 Apr 99 p(r) changed to p(r.px) for clarity (Dave Abrahams)
-// 21 Apr 99 reset() self assignment fix (Valentin Bonnard)
-// 21 Apr 99 dispose() provided to improve clarity (Valentin Bonnard)
-// 27 Apr 99 leak when new throws fixes (Dave Abrahams)
-// 21 Oct 98 initial Version (Greg Colvin/Beman Dawes)
-
-#ifndef LYX_SMART_PTR_H
-#define LYX_SMART_PTR_H
-
-#include <boost/config.hpp> // for broken compiler workarounds
-#include <cstddef> // for std::size_t
-#include <memory> // for std::auto_ptr
-#include <algorithm> // for std::swap
-#include "support/utility.h" // for boost::noncopyable, checked_delete, checked_array_delete
-#include <functional> // for std::less
-#include <boost/static_assert.hpp> // for BOOST_STATIC_ASSERT
-
-#ifdef LYX_NO_EXCEPTIONS
-#include <assert.h>
-#endif
-
-namespace lyx {
-
-// shared_ptr --------------------------------------------------------------//
-
-// An enhanced relative of scoped_ptr with reference counted copy semantics.
-// The object pointed to is deleted when the last shared_ptr pointing to it
-// is destroyed or reset.
-
-template<typename T> class shared_c_ptr {
- public:
- typedef T element_type;
-
- explicit shared_c_ptr(T* p =0) : px(p) {
-#ifndef LYX_NO_EXCEPTIONS
- try { pn = new long(1); } // fix: prevent leak if new throws
- catch (...) { checked_delete(p); throw; }
-#else
- pn = new long(1);
- assert(pn != 0);
-#endif
- }
-
- shared_c_ptr(const shared_c_ptr& r) : px(r.px) { ++*(pn = r.pn); } // never throws
-
- ~shared_c_ptr() { dispose(); }
-
- shared_c_ptr& operator=(const shared_c_ptr& r) {
- share(r.px,r.pn);
- return *this;
- }
-
-#if !defined(BOOST_NO_MEMBER_TEMPLATES)
- template<typename Y>
- shared_c_ptr(const shared_c_ptr<Y>& r) : px(r.px) { // never throws
- ++*(pn = r.pn);
- }
-#ifndef BOOST_NO_AUTO_PTR
- template<typename Y>
- explicit shared_c_ptr(std::auto_ptr<Y>& r) {
- pn = new long(1); // may throw
- px = r.release(); // fix: moved here to stop leak if new throws
- }
-#endif
-
- template<typename Y>
- shared_c_ptr& operator=(const shared_c_ptr<Y>& r) {
- share(r.px,r.pn);
- return *this;
- }
-
-#ifndef BOOST_NO_AUTO_PTR
- template<typename Y>
- shared_c_ptr& operator=(std::auto_ptr<Y>& r) {
- // code choice driven by guarantee of "no effect if new throws"
- if (*pn == 1) { checked_delete(px); }
- else { // allocate new reference counter
- long * tmp = new long(1); // may throw
- --*pn; // only decrement once danger of new throwing is past
- pn = tmp;
- } // allocate new reference counter
- px = r.release(); // fix: moved here so doesn't leak if new throws
- return *this;
- }
-#endif
-#else
-#ifndef BOOST_NO_AUTO_PTR
- explicit shared_c_ptr(std::auto_ptr<T>& r) {
- pn = new long(1); // may throw
- px = r.release(); // fix: moved here to stop leak if new throws
- }
-
- shared_c_ptr& operator=(std::auto_ptr<T>& r) {
- // code choice driven by guarantee of "no effect if new throws"
- if (*pn == 1) { checked_delete(px); }
- else { // allocate new reference counter
- long * tmp = new long(1); // may throw
- --*pn; // only decrement once danger of new throwing is past
- pn = tmp;
- } // allocate new reference counter
- px = r.release(); // fix: moved here so doesn't leak if new throws
- return *this;
- }
-#endif
-#endif
-
- void reset(T* p=0) {
- if (px == p) return; // fix: self-assignment safe
- if (--*pn == 0) { checked_delete(px); }
- else { // allocate new reference counter
-#ifndef LYX_NO_EXCEPTIONS
- try { pn = new long; } // fix: prevent leak if new throws
- catch (...) {
- ++*pn; // undo effect of --*pn above to meet effects guarantee
- checked_delete(p);
- throw;
- } // catch
-#else
- pn = new long;
- assert(pn != 0);
-#endif
- } // allocate new reference counter
- *pn = 1;
- px = p;
- } // reset
-
- T& operator*() const { return *px; } // never throws
- T* operator->() const { return px; } // never throws
- T* get() const { return px; } // never throws
-
- long use_count() const { return *pn; } // never throws
- bool unique() const { return *pn == 1; } // never throws
-
- void swap(shared_c_ptr<T>& other) // never throws
- { std::swap(px,other.px); std::swap(pn,other.pn); }
-
-// Tasteless as this may seem, making all members public allows member templates
-// to work in the absence of member template friends. (Matthew Langston)
-// Don't split this line into two; that causes problems for some GCC 2.95.2 builds
-#if defined(BOOST_NO_MEMBER_TEMPLATES) || !defined(BOOST_NO_MEMBER_TEMPLATE_FRIENDS)
- private:
-#endif
-
- T* px; // contained pointer
- long* pn; // ptr to reference counter
-
-// Don't split this line into two; that causes problems for some GCC 2.95.2 builds
-#if !defined( BOOST_NO_MEMBER_TEMPLATES ) && !defined( BOOST_NO_MEMBER_TEMPLATE_FRIENDS )
- template<typename Y> friend class shared_ptr;
-#endif
-
- void dispose() { if (--*pn == 0) { checked_delete(px); delete pn; } }
-
- void share(T* rpx, long* rpn) {
- if (pn != rpn) { // Q: why not px != rpx? A: fails when both == 0
- ++*rpn; // done before dispose() in case rpn transitively
- // dependent on *this (bug reported by Ken Johnson)
- dispose();
- px = rpx;
- pn = rpn;
- }
- } // share
-}; // shared_ptr
-
-template<typename T, typename U>
- inline bool operator==(const shared_c_ptr<T>& a, const shared_c_ptr<U>& b)
- { return a.get() == b.get(); }
-
-template<typename T, typename U>
- inline bool operator!=(const shared_c_ptr<T>& a, const shared_c_ptr<U>& b)
- { return a.get() != b.get(); }
-
-} // namespace boost
-
-// specializations for things in namespace std -----------------------------//
-
-#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-
-namespace std {
-
-// Specialize std::swap to use the fast, non-throwing swap that's provided
-// as a member function instead of using the default algorithm which creates
-// a temporary and uses assignment.
-
-template<typename T>
- inline void swap(lyx::shared_c_ptr<T>& a, lyx::shared_c_ptr<T>& b)
- { a.swap(b); }
-
-// Specialize std::less so we can use shared pointers and arrays as keys in
-// associative collections.
-
-// It's still a controversial question whether this is better than supplying
-// a full range of comparison operators (<, >, <=, >=).
-
-template<typename T>
- struct less< lyx::shared_c_ptr<T> >
- : binary_function<lyx::shared_c_ptr<T>, lyx::shared_c_ptr<T>, bool>
- {
- bool operator()(const lyx::shared_c_ptr<T>& a,
- const lyx::shared_c_ptr<T>& b) const
- { return less<T*>()(a.get(),b.get()); }
- };
-
-} // namespace std
-
-#endif // ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
-
-#endif // LYX_SMART_PTR_H
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