( std::forward

(d)\n , std11::bool_constant< std11::is_nothrow_constructible::value >() ) ) )\n , execute_on_reset( execute )\n {}\n\n // Move constructor.\n //\n // The stored resource handle is initialized from the one of other, using std::move if\n // std::is_nothrow_move_constructible_v is true.\n //\n // If initialization of the stored resource handle throws an exception, other is not modified.\n //\n // Then, the deleter is initialized with the one of other, using std::move if\n // std::is_nothrow_move_constructible_v is true.\n //\n // If initialization of the deleter throws an exception and std::is_nothrow_move_constructible_v is true and\n // other owns the resource, calls the deleter of other with res_ to dispose the resource, then calls other.release().\n //\n // After construction, the constructed unique_resource owns its resource if and only if other owned the resource before\n // the construction, and other is set to not own the resource.\n\n unique_resource( unique_resource && other )\n scope_noexcept_op(\n std11::is_nothrow_move_constructible::value && std11::is_nothrow_move_constructible::value\n )\n try\n : resource( conditional_move( std::move(other.resource), typename std11::bool_constant< std11::is_nothrow_move_assignable::value >() ) )\n , deleter( conditional_move( std::move(other.deleter ), typename std11::bool_constant< std11::is_nothrow_move_constructible::value >() ) )\n , execute_on_reset( std14::exchange( other.execute_on_reset, false ) )\n {}\n catch(...)\n {\n if ( other.execute_on_reset && std11::is_nothrow_move_constructible::value )\n {\n other.get_deleter()( this->get() );\n other.release();\n }\n }\n\n ~unique_resource()\n {\n reset();\n }\n\nprivate:\n // assign_rd( r, is_nothrow_move_assignable_v, is_nothrow_move_assignable_v ):\n\n void assign_rd( unique_resource && other, std11::true_type, std11::true_type )\n {\n resource = std::move( other.resource );\n deleter = std::move( other.deleter );\n }\n\n void assign_rd( unique_resource && other, std11::true_type, std11::false_type )\n {\n resource = std::move( other.resource );\n deleter = other.deleter;\n }\n\n void assign_rd( unique_resource && other, std11::false_type, std11::true_type )\n {\n deleter = std::move( other.deleter );\n resource = other.resource;\n }\n\n void assign_rd( unique_resource && other, std11::false_type, std11::false_type )\n {\n resource = other.resource;\n deleter = other.deleter;\n }\n\npublic:\n unique_resource & operator=( unique_resource && other )\n scope_noexcept_op(\n std11::is_nothrow_move_assignable::value && std11::is_nothrow_move_assignable::value\n )\n {\n scope_static_assert(\n std11::is_nothrow_move_assignable::value || std11::is_copy_assignable::value\n , \"The resource must be nothrow-move assignable, or copy assignable\"\n );\n\n scope_static_assert(\n std11::is_nothrow_move_assignable::value || std11::is_copy_assignable::value\n , \"The deleter must be nothrow-move assignable, or copy assignable\");\n\n if ( &other != this )\n {\n reset();\n assign_rd(\n std::move( other )\n , typename std11::bool_constant< std11::is_nothrow_move_assignable::value >()\n , typename std11::bool_constant< std11::is_nothrow_move_assignable::value >()\n );\n execute_on_reset = std14::exchange( other.execute_on_reset, false );\n }\n\n return *this;\n }\n\n void reset() scope_noexcept\n {\n if ( execute_on_reset )\n {\n execute_on_reset = false;\n get_deleter()( get() );\n }\n }\n\n template< class RR >\n void reset( RR && r )\n#if scope_CPP11_110\n {\n auto && guard = make_scope_fail( [&, this]{ get_deleter()(r); } ); // -Wunused-variable on clang\n\n reset();\n resource = conditional_forward( std::forward(r)\n , std11::bool_constant< std11::is_nothrow_assignable::value >() );\n execute_on_reset = true;\n }\n#else // scope_CPP11_110\n try\n {\n reset();\n resource = conditional_forward( std::forward(r)\n , std11::bool_constant< std11::is_nothrow_assignable::value >() );\n execute_on_reset = true;\n }\n catch(...)\n {\n this->get_deleter()(r);\n }\n#endif // scope_CPP11_110\n\n void release() scope_noexcept\n {\n execute_on_reset = false;\n }\n\n R1 const & get() const scope_noexcept\n {\n return resource;\n }\n\n // VC120/VS2013 produces ICE:\n\n#if scope_HAVE( TRAILING_RETURN_TYPE ) && !scope_BETWEEN( scope_COMPILER_MSVC_VERSION, 120, 130 )\n template< class RR=R >\n auto operator*() const scope_noexcept ->\n scope_ENABLE_IF_R_(\n std::is_pointer::value && !std::is_void::type>::value\n , typename std::add_lvalue_reference::type>::type\n )\n#else\n typename std::add_lvalue_reference::type>::type\n operator*() const scope_noexcept\n#endif\n {\n return *get();\n }\n\n // VC120/VS2013 produces ICE:\n\n#if scope_HAVE( TRAILING_RETURN_TYPE ) && !scope_BETWEEN( scope_COMPILER_MSVC_VERSION, 120, 130 )\n template< class RR=R >\n auto operator->() const scope_noexcept -> scope_ENABLE_IF_R_( std::is_pointer::value, R )\n#else\n R operator->() const scope_noexcept\n#endif\n {\n return get();\n }\n\n D const & get_deleter() const scope_noexcept\n {\n return deleter;\n }\n\nscope_is_delete_access:\n\tunique_resource & operator=( unique_resource const & ) scope_is_delete;\n\tunique_resource( unique_resource const & ) scope_is_delete;\n\nprivate:\n R1 resource;\n D deleter;\n bool execute_on_reset;\n};\n\n#if scope_HAVE( DEDUCTION_GUIDES )\ntemplate< typename R, typename D >\nunique_resource(R, D) -> unique_resource;\n#endif\n\n// special factory function make_unique_resource_checked():\n\n#if scope_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG\n\ntemplate< class R, class D, class S = typename std11::decay::type >\nunique_resource\n<\n typename std11::decay::type\n , typename std11::decay::type\n>\n//make_unique_resource_checked( R && resource, typename std20::type_identity::type const & invalid, D && deleter )\nmake_unique_resource_checked( R && resource, S const & invalid, D && deleter )\nscope_noexcept_op\n((\n std11::is_nothrow_constructible::type, R>::value\n && std11::is_nothrow_constructible::type, D>::value\n))\n{\n return unique_resource::type, typename std11::decay::type>(\n std::forward( resource ), std::forward( deleter ), !bool( resource == invalid ) );\n}\n\n#else // scope_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG\n\n// avoid default template arguments:\n\ntemplate< class R, class D >\nunique_resource\n<\n typename std11::decay::type\n , typename std11::decay::type\n>\nmake_unique_resource_checked( R && resource, R const & invalid, D && deleter )\nscope_noexcept_op\n((\n std11::is_nothrow_constructible::type, R>::value\n && std11::is_nothrow_constructible::type, D>::value\n))\n{\n return unique_resource::type, typename std11::decay::type>(\n std::forward( resource ), std::forward( deleter ), !bool( resource == invalid ) );\n}\n\ntemplate< class R, class D, class S >\nunique_resource\n<\n typename std11::decay::type\n , typename std11::decay::type\n>\nmake_unique_resource_checked( R && resource, S const & invalid, D && deleter )\nscope_noexcept_op\n((\n std11::is_nothrow_constructible::type, R>::value\n && std11::is_nothrow_constructible::type, D>::value\n))\n{\n return unique_resource::type, typename std11::decay::type>(\n std::forward( resource ), std::forward( deleter ), !bool( resource == invalid ) );\n}\n\n#endif // scope_HAVE_DEFAULT_FUNCTION_TEMPLATE_ARG\n\n#else // #if scope_USE_POST_CPP98_VERSION\n\n//\n// C++98 version:\n//\n\nstruct on_exit_policy\n{\n mutable bool invoke_;\n\n on_exit_policy()\n : invoke_( true )\n {}\n\n on_exit_policy( on_exit_policy const & other )\n : invoke_( other.invoke_ )\n {\n other.invoke_ = false;\n }\n\n void release()\n {\n invoke_ = false;\n }\n\n bool perform()\n {\n return invoke_;\n }\n};\n\nstruct on_fail_policy\n{\n mutable int ucount_;\n\n on_fail_policy()\n : ucount_( detail::uncaught_exceptions() )\n {}\n\n on_fail_policy( on_fail_policy const & other )\n : ucount_( other.ucount_ )\n {\n other.ucount_ = std::numeric_limits::max();\n }\n\n void release()\n {\n ucount_ = std::numeric_limits::max();\n }\n\n bool perform()\n {\n return ucount_ < detail::uncaught_exceptions();\n }\n};\n\nstruct on_success_policy\n{\n mutable int ucount_;\n\n on_success_policy()\n : ucount_( detail::uncaught_exceptions() )\n {}\n\n on_success_policy( on_success_policy const & other )\n : ucount_( other.ucount_ )\n {\n other.ucount_ = -1;\n }\n\n void release()\n {\n ucount_ = -1;\n }\n\n bool perform()\n {\n return ucount_ >= detail::uncaught_exceptions();\n }\n};\n\ntemplate< typename Policy, typename Action >\nclass scope_guard : public Policy\n{\npublic:\n scope_guard( Action action )\n : Policy()\n , action_( action )\n {}\n\n scope_guard( scope_guard const & other )\n : Policy( other )\n , action_( other.action_ )\n {}\n\n virtual ~scope_guard()\n {\n if ( this->perform() )\n action_();\n }\n\nprivate:\n scope_guard & operator=( scope_guard const & );\n\nprivate:\n Action action_;\n};\n\ntemplate< typename Fn = void(*)() >\nclass scope_exit : public scope_guard< on_exit_policy, Fn >\n{\npublic:\n scope_exit( Fn action ) : scope_guard( action ) {}\n};\n\ntemplate< typename Fn = void(*)() >\nclass scope_fail : public scope_guard< on_fail_policy, Fn >\n{\npublic:\n scope_fail( Fn action ) : scope_guard( action ) {}\n};\n\ntemplate< typename Fn = void(*)() >\nclass scope_success : public scope_guard< on_success_policy, Fn >\n{\npublic:\n scope_success( Fn action ) : scope_guard( action ) {}\n};\n\n// unique_resource (C++98):\n\ntemplate< class R, class D >\nclass unique_resource\n{\npublic:\n unique_resource()\n : resource()\n , deleter()\n , execute_on_reset( false )\n {}\n\n template< class RR, class DD >\n unique_resource( RR const & r, DD const & d, bool execute = true )\n : resource( r )\n , deleter( d )\n , execute_on_reset( execute )\n {}\n\n // 'move' construction\n\n unique_resource( unique_resource const & other )\n : resource( other.resource )\n , deleter( other.deleter )\n , execute_on_reset( other.execute_on_reset )\n {\n other.execute_on_reset = false; // other.release();\n }\n\n ~unique_resource()\n {\n reset();\n }\n\n // 'move' assignment\n\n unique_resource & operator=( unique_resource const & other )\n {\n reset();\n resource = other.resource;\n deleter = other.deleter;\n execute_on_reset = other.execute_on_reset;\n other.execute_on_reset = false; // other.release();\n\n return *this;\n }\n\n void reset()\n {\n if ( execute_on_reset )\n {\n execute_on_reset = false;\n get_deleter()( get() );\n }\n }\n\n template< class RR >\n void reset( RR const & r )\n try\n {\n reset();\n\t\tresource = r;\n execute_on_reset = true;\n }\n catch(...)\n {\n this->get_deleter()( r );\n }\n\n void release()\n {\n execute_on_reset = false;\n }\n\n R const & get() const\n {\n return resource;\n }\n\n typename std11::remove_pointer::type &\n operator*() const\n {\n return *get();\n }\n\n R operator->() const\n {\n return get();\n }\n\n D const & get_deleter() const\n {\n return deleter;\n }\n\nprivate:\n // using R1 = conditional_t< is_reference_v, reference_wrapper>, R >; // exposition only\n // typedef R R1;\n R resource;\n D deleter;\n mutable bool execute_on_reset;\n};\n\ntemplate< class EF >\nscope_exit make_scope_exit( EF action )\n{\n return scope_exit( action );\n}\n\ntemplate< class EF >\nscope_fail make_scope_fail( EF action )\n{\n return scope_fail( action );\n}\n\ntemplate< class EF >\nscope_success make_scope_success( EF action )\n{\n return scope_success( action );\n}\n\ntemplate< class R, class D, class S >\nunique_resource\n<\n typename std11::decay::type\n , typename std11::decay::type\n>\nmake_unique_resource_checked( R const & resource, S const & invalid, D const & deleter )\n{\n return unique_resource::type, typename std11::decay::type>(\n resource,deleter, !bool( resource == invalid ) );\n}\n\n#endif // #if scope_USE_POST_CPP98_VERSION\n\n}} // namespace nonstd::scope\n\n//\n// Make type available in namespace nonstd:\n//\n\nnamespace nonstd\n{\n using scope::scope_exit;\n using scope::scope_fail;\n using scope::scope_success;\n using scope::unique_resource;\n\n using scope::make_scope_exit;\n using scope::make_scope_fail;\n using scope::make_scope_success;\n using scope::make_unique_resource_checked;\n}\n\n#endif // scope_USES_STD_SCOPE\n\n#endif // 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