January 2006 - Boost - lists.preview.boost.org

[iostream] possible bug
by Nicola Musatti 08 Jan '06

08 Jan '06

Hallo, when trying to build up a configuration for the new Borland BCB 2006 compiler I got an error message complaining about line 49 in file boost/iostreams/positioning.hpp: inline stream_offset fpos_t_to_offset(fpos_t pos) ^^^^^^ Shouldn't the above read std::fpos_t ? This solves the problem for my compiler. Cheers, Nicola Musatti

1 0

[typeof] function references and gcc 3.3.5
by Alexander Nasonov 08 Jan '06

08 Jan '06

The following code doesn't compile on gcc 3.3.5 typedef int (fun)(bool); fun& foo(); BOOST_STATIC_ASSERT((boost::is_same<BOOST_TYPEOF(foo()), fun>::value)); The error is error: no matching function for call to `ensure_obj(int(&)(bool))' This can be fixed by introducing more specialized ensure_obj: template<class T> T& ensure_obj(const T&, int); template<class R, class T0> R(& ensure_obj(R (&)(T0), ...) )(T0); template<class R, class T0, class T1> R(& ensure_obj(R (&)(T0,T1), ...) )(T0,T1); // ... ( second argument is not required for gcc 3.3.5, it's there to resolve ambuiguity on other compilers ) This fix has been tested on three different compilers: > ~/pkgsrc-root/gcc3/bin/g++ -v Reading specs from /home/alnsn/pkgsrc-root/gcc3/lib/gcc-lib/i386-pc-freebsd6/3.3.5/specs Configured with: ./configure --prefix=/home/alnsn/pkgsrc-root/gcc3 --host=i386-pc-freebsd6 --enable-shared --enable-languages=c++ Thread model: posix gcc version 3.3.5 > g++ -v Using built-in specs. Configured with: FreeBSD/i386 system compiler Thread model: posix gcc version 3.4.4 [FreeBSD] 20050518 > /usr/local/intel_cc_80/bin/icpc -v -V Intel(R) C++ Compiler for 32-bit applications, Version 8.1 Build 20050207Z Package ID: l_cc_pc_8.1.028 Copyright (C) 1985-2005 Intel Corporation. All rights reserved. FOR NON-COMMERCIAL USE ONLY Version 8.1 Also, other contexts mentioned by Arkadiy in other thread should be modified. BTW, why test/function_ref.cpp checks only test_wrapper type, not a function reference? -- Alexander Nasonov

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m4 macro for boost?
by Thomas Porschberg 07 Jan '06

07 Jan '06

Hi, I want integrate some of the boost libraries in a project which has the GNU autoconf/automake tools as build system. I have to cope some questions like: Where is your boost library installed ? Is the version of your boost-lib recent enough ? Can I compile a small program using the boost libraries ? Unfortunately I'm not an experienced GNU auto[conf/make] user. But I note that a lot of software components come with a m4 macro to support the configuration process. I found a boost.m4 file at http://alien.cern.ch/cache/org.glite/project/boost.m4. I tried it to include to my project but it needs some revision. Can someone from the boost people give some advice ? I know that boost does use bjam. But GNU auto[conf/make] are very common(due to cygwin/mingw even under windows) so that I hope to find an answer. best regards, Thomas --

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Iostreams 'drain' algorithm proposal
by Andrew Walrond 07 Jan '06

07 Jan '06

Hello list. New here, but a Boost user so thought it was time I started lurking with a view to contributing. When using boost::iostreams, I find I frequently need/implement a 'drain' algorithm. This is identical to boost::iostreams::copy, except that it doesn't close the Sink. This allows mutiple sources to be 'drained' into a single sink. Unless there is a generic algorithm for doing this that I have missed, I'd like to propose the addition of the 'drain' algorithm to boost::iostreams. I have a patch, should there be any interest. Andrew Walrond

2 2

main cvs anonymous login problem
by Bjørn Roald 07 Jan '06

07 Jan '06

Hi, I am trying to update my cvs working directory, but trying to log on to the server failes. Anybody have a clue what is going on?? cvs -d:pserver:anonymous@cvs.sourceforge.net:/cvsroot/boost login Logging in to :pserver:anonymous@cvs.sourceforge.net:2401/cvsroot/boost CVS password: cvs login: authorization failed: server cvs.sourceforge.net rejected access to /cvsroot/boost for user anonymous Thanks Bjørn

4 4

How do I use bjam?
by Daryle Walker 07 Jan '06

07 Jan '06

I want to try out the documentation run described by the message archived at <http://article.gmane.org/gmane.comp.lib.boost.documentation/1472>. I downloaded bjam for Mac OS X from our SourceForge download area. I placed it in my grand Boost directory in my user directory. (I have separate sub-directories for Boost-1.33.1-from-a-ZIP, Boost CVS, and the sandbox CVS.) I made a link from bjam to ~/bin. When I ran bjam, I got: Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from /Users/daryle up to the root and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: /usr/share/SOMETHING-I-FORGOT. Please consult the documentation at 'http://www.boost.org'. Now, I said I have the Boost files within my user directory, _not_ in a system level directory like Boost.Build assumes. I tried exporting a value for BOOST_BUILD_PATH to my CVS version of Boost, and it didn't do anything: Unable to load Boost.Build: could not find "boost-build.jam" --------------------------------------------------------------- Attempted search from /Users/daryle up to the root and in these directories from BOOST_BUILD_PATH and BOOST_ROOT: ~/Documents/Programming/Boost/main-cvs/boost/. Please consult the documentation at 'http://www.boost.org'. It doesn't matter if I put "bjam --v2" instead, nor any other command line option. Why can't it lock on to my Boost files? When I say "ran bjam," I just entered "bjam" as a command within a random directory, like my home directory, with no special Boost files within it. I also ran it like the Gmane message, but it still couldn't start up. A related question: is the regular Boost.Build set-up useful for someone that creates Boost libraries using the regular and sandbox CVSes? After all, any installed headers and (static and/or dynamic) libraries would get stale after any CVS update. -- Daryle Walker Mac, Internet, and Video Game Junkie darylew AT hotmail DOT com

4 9

[range] why not range_result_iterator remove_cv?
by MB 07 Jan '06

07 Jan '06

Hi, I think non-intrusive customization way needs four specializations; 'X', 'const X', 'volatile X' and 'const volatile X'. At last, twenty specializations are required for five metafunctions. I view that's something like the pitfall of public virtual interfaces. Only range_result_iterator happens to work around by using remove_cv. See: I added followings to <libs/range/doc/example.cpp>: template< class Range > typename boost::range_result_iterator<Range>::type my_begin(Range& rng) { return boost::begin(rng); } // then... my_begin(cpair); // error Why not something like: template< class T > struct range_result_iterator : mpl::eval_if< is_const<T>, range_const_iterator< typename remove_cv<T>::type >, range_iterator< typename remove_cv<T>::type > > { }; Regards, MB p-stade.sourceforge.net

2 2

Boost regression notification (2006-01-06 [HEAD])
by Douglas Gregor 07 Jan '06

07 Jan '06

Boost Regression test failures Report time: 2006-01-06T14:16:52Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-HEAD/developer/issues… The following platforms have a large number of failures: gcc-3.2.3-linux 1102 failures in 22 libraries (563 are from non-broken platforms) random (1) concept_check (19 of 20 failures are from non-broken platforms) iostreams (22) conversion (5) graph (6 of 7 failures are from non-broken platforms) numeric/interval (3) program_options (7) rational (5) tr1 (192 of 194 failures are from non-broken platforms) parameter (12) math (0 of 1 failures are from non-broken platforms) wave (3 of 6 failures are from non-broken platforms) test (15 of 16 failures are from non-broken platforms) serialization (168 of 598 failures are from non-broken platforms) spirit (0 of 98 failures are from non-broken platforms) xpressive (28 of 29 failures are from non-broken platforms) date_time (5 of 12 failures are from non-broken platforms) multi_array (8) multi_index (0 of 1 failures are from non-broken platforms) ptr_container (0 of 12 failures are from non-broken platforms) typeof (4) filesystem (36 of 41 failures are from non-broken platforms) Test failures marked with a (*) represent tests that failed on platforms that are considered broken. They are likely caused by misconfiguration by the regression tester or a failure in a core library such as Test or Config. |random| random_test: intel-9.0-linux |concept_check| stl_concept_covering: cw-9_4 cw-9_5-darwin gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux gcc-3.2.3-linux* gcc-3.3.6-linux gcc-3.3.6-linux gcc-3.4.4-linux gcc-3.4.4-linux gcc-3_3-darwin gcc-3_4_3-sunos gcc-4_0-darwin intel-9.0-linux intel-win32-8_1 intel-win32-9_0 mingw-3_4_2 mingw-3_4_2 tru64cxx71-006 vc-7_1 vc-7_1 |iostreams| auto_close_test: tru64cxx71-006 code_converter_test: tru64cxx71-006 component_access_test: tru64cxx71-006 compose_test: tru64cxx71-006 copy_test: tru64cxx71-006 counter_test: tru64cxx71-006 example_test: tru64cxx71-006 filtering_stream_test: tru64cxx71-006 finite_state_filter_test: tru64cxx71-006 flush_test: tru64cxx71-006 invert_test: tru64cxx71-006 line_filter_test: tru64cxx71-006 newline_test: tru64cxx71-006 pipeline_test: tru64cxx71-006 regex_filter_test: tru64cxx71-006 restrict_test: tru64cxx71-006 seekable_file_test: tru64cxx71-006 seekable_filter_test: tru64cxx71-006 stdio_filter_test: tru64cxx71-006 symmetric_filter_test: tru64cxx71-006 tee_test: tru64cxx71-006 wide_stream_test: tru64cxx71-006 |conversion| lexical_cast_test: gcc-4_0-darwin intel-win32-8_1 intel-win32-9_0 vc-7_1 vc-7_1 |graph| csr_graph_test: cw-9_4 gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux dijkstra_heap_performance: cw-9_4 graphviz_test: gcc-3.2.3-linux* vc-7_1 vc-7_1 |numeric/interval| mul: tru64cxx71-006 overflow: tru64cxx71-006 pi: tru64cxx71-006 |program_options| cmdline_test_dll: cw-9_4 options_description_test_dll: cw-9_4 parsers_test_dll: cw-9_4 positional_options_test_dll: cw-9_4 unicode_test_dll: cw-9_4 variable_map_test_dll: cw-9_4 winmain_dll: cw-9_4 |rational| rational_test: gcc-2.95.3-stlport-4.6.2-linux intel-9.0-linux intel-win32-9_0 vc-7_1 vc-7_1 |tr1| run_complex_overloads: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_run_complex_overloads: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_run_random: cw-9_4 cw-9_5-darwin std_test_array: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_bind: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_boost: tru64cxx71-006 std_test_complex: cw-9_4 cw-9_5-darwin std_test_function: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_hash: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_mem_fn: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_random: cw-9_4 cw-9_5-darwin std_test_reference_wrapper: tru64cxx71-006 std_test_regex: cw-9_4 cw-9_5-darwin std_test_result_of: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_shared_ptr: tru64cxx71-006 std_test_tr1_include: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_tuple: cw-9_4 cw-9_5-darwin tru64cxx71-006 std_test_type_traits: cw-9_4 cw-9_5-darwin gcc-3.2.3-linux* test_array: cw-9_4 test_complex: cw-9_4 cw-9_5-darwin test_deque: tru64cxx71-006 test_exception: gcc-2.95.3-stlport-4.6.2-linux test_function: cw-9_4 cw-9_5-darwin test_functional: tru64cxx71-006 test_list: tru64cxx71-006 test_memory: tru64cxx71-006 test_new: gcc-2.95.3-stlport-4.6.2-linux test_queue: tru64cxx71-006 test_random: cw-9_4 cw-9_5-darwin test_result_of: cw-9_4 cw-9_5-darwin test_stack: tru64cxx71-006 test_stdexcept: gcc-2.95.3-stlport-4.6.2-linux tru64cxx71-006 test_tr1_include: cw-9_4 cw-9_5-darwin test_tuple: cw-9_4 cw-9_5-darwin test_tuple_tricky: cw-9_4 cw-9_5-darwin test_type_traits: gcc-3.2.3-linux* test_typeinfo: tru64cxx71-006 test_vector: tru64cxx71-006 tr1_add_const_test: cw-9_4 cw-9_5-darwin tr1_add_cv_test: cw-9_4 cw-9_5-darwin tr1_add_pointer_test: cw-9_4 cw-9_5-darwin tr1_add_reference_test: cw-9_4 cw-9_5-darwin tr1_add_volatile_test: cw-9_4 cw-9_5-darwin tr1_aligned_storage_test: cw-9_4 cw-9_5-darwin tr1_alignment_of_test: cw-9_4 cw-9_5-darwin tr1_extent_test: cw-9_4 cw-9_5-darwin tr1_has_nothrow_assign_test: cw-9_4 cw-9_5-darwin tr1_has_nothrow_constr_test: cw-9_4 cw-9_5-darwin tr1_has_nothrow_copy_test: cw-9_4 cw-9_5-darwin tr1_has_tr1_ref_wrap_fail: cw-9_4 cw-9_5-darwin tr1_has_tr1_shared_ptr_fail: cw-9_4 cw-9_5-darwin tr1_has_tr1_tuple_fail: cw-9_4 cw-9_5-darwin tr1_has_trivial_assign_test: cw-9_4 cw-9_5-darwin tr1_has_trivial_constr_test: cw-9_4 cw-9_5-darwin tr1_has_trivial_copy_test: cw-9_4 cw-9_5-darwin tr1_has_trivial_destructor_test: cw-9_4 cw-9_5-darwin tr1_has_virtual_destructor_test: cw-9_4 cw-9_5-darwin tr1_is_arithmetic_test: cw-9_4 cw-9_5-darwin tr1_is_array_test: cw-9_4 cw-9_5-darwin tr1_is_base_of_test: cw-9_4 cw-9_5-darwin tr1_is_class_test: cw-9_4 cw-9_5-darwin tr1_is_compound_test: cw-9_4 cw-9_5-darwin tr1_is_const_test: cw-9_4 cw-9_5-darwin tr1_is_convertible_test: cw-9_4 cw-9_5-darwin tr1_is_empty_test: cw-9_4 cw-9_5-darwin tr1_is_enum_test: cw-9_4 cw-9_5-darwin tr1_is_floating_point_test: cw-9_4 cw-9_5-darwin tr1_is_function_test: cw-9_4 cw-9_5-darwin tr1_is_fundamental_test: cw-9_4 cw-9_5-darwin tr1_is_integral_test: cw-9_4 cw-9_5-darwin tr1_is_member_func_test: cw-9_4 cw-9_5-darwin tr1_is_member_obj_test: cw-9_4 cw-9_5-darwin tr1_is_member_pointer_test: cw-9_4 cw-9_5-darwin tr1_is_object_test: cw-9_4 cw-9_5-darwin tr1_is_pod_test: cw-9_4 cw-9_5-darwin tr1_is_pointer_test: cw-9_4 cw-9_5-darwin tr1_is_polymorphic_test: cw-9_4 cw-9_5-darwin tr1_is_reference_test: cw-9_4 cw-9_5-darwin tr1_is_same_test: cw-9_4 cw-9_5-darwin tr1_is_scalar_test: cw-9_4 cw-9_5-darwin tr1_is_signed_test: cw-9_4 cw-9_5-darwin tr1_is_union_test: cw-9_4 cw-9_5-darwin tr1_is_unsigned_test: cw-9_4 cw-9_5-darwin tr1_is_void_test: cw-9_4 cw-9_5-darwin tr1_is_volatile_test: cw-9_4 cw-9_5-darwin tr1_rank_test: cw-9_4 cw-9_5-darwin tr1_remove_all_extents_test: cw-9_4 cw-9_5-darwin tr1_remove_const_test: cw-9_4 cw-9_5-darwin tr1_remove_cv_test: cw-9_4 cw-9_5-darwin tr1_remove_extent_test: cw-9_4 cw-9_5-darwin tr1_remove_pointer_test: cw-9_4 cw-9_5-darwin tr1_remove_reference_test: cw-9_4 cw-9_5-darwin tr1_remove_volatile_test: cw-9_4 cw-9_5-darwin tr1_tricky_abstract_type_test: cw-9_4 cw-9_5-darwin tr1_tricky_add_pointer_test: cw-9_4 cw-9_5-darwin tr1_tricky_function_type_test: cw-9_4 cw-9_5-darwin tr1_tricky_incomplete_type_test: cw-9_4 cw-9_5-darwin tr1_tricky_is_enum_test: cw-9_4 cw-9_5-darwin tr1_tricky_partial_spec_test: cw-9_4 cw-9_5-darwin |parameter| basics: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux efficiency: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux macros: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux sfinae: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux tutorial: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux unnamed: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux |math| log1p_expm1_test: gcc-3.2.3-linux* |wave| test_re2c_lexer: gcc-3.2.3-linux* test_slex_lexer: gcc-3.2.3-linux* testwave: cw-9_5-darwin testwave_dll: cw-9_4 cw-9_5-darwin gcc-3.2.3-linux* |test| test_fp_comparisons: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux test_tools_test: gcc-2.95.3-linux gcc-2.95.3-stlport-4.6.2-linux gcc-3.2.3-linux* gcc-3.3.6-linux gcc-3.3.6-linux gcc-3.4.4-linux gcc-3.4.4-linux gcc-3_3-darwin gcc-3_4_3-sunos gcc-4_0-darwin intel-9.0-linux mingw-3_4_2 mingw-3_4_2 tru64cxx71-006 |serialization| test_array_binary_archive: gcc-3.2.3-linux* test_array_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_array_text_archive: gcc-3.2.3-linux* test_array_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_array_text_warchive: gcc-3.2.3-linux* test_array_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_array_xml_archive: gcc-3.2.3-linux* test_array_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_array_xml_warchive: gcc-3.2.3-linux* test_array_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_binary_binary_archive: gcc-3.2.3-linux* test_binary_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_binary_text_archive: gcc-3.2.3-linux* test_binary_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_binary_text_warchive: gcc-3.2.3-linux* test_binary_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_binary_xml_archive: gcc-3.2.3-linux* test_binary_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_binary_xml_warchive: gcc-3.2.3-linux* test_binary_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_load_binary_archive: gcc-3.2.3-linux* test_class_info_load_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_load_text_archive: gcc-3.2.3-linux* test_class_info_load_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_load_text_warchive: gcc-3.2.3-linux* test_class_info_load_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_load_xml_archive: gcc-3.2.3-linux* test_class_info_load_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_load_xml_warchive: gcc-3.2.3-linux* test_class_info_load_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_save_binary_archive: gcc-3.2.3-linux* test_class_info_save_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_save_text_archive: gcc-3.2.3-linux* test_class_info_save_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_save_text_warchive: gcc-3.2.3-linux* test_class_info_save_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_save_xml_archive: gcc-3.2.3-linux* test_class_info_save_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_class_info_save_xml_warchive: gcc-3.2.3-linux* test_class_info_save_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_contained_class_binary_archive: gcc-3.2.3-linux* test_contained_class_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_contained_class_text_archive: gcc-3.2.3-linux* test_contained_class_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_contained_class_text_warchive: gcc-3.2.3-linux* test_contained_class_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_contained_class_xml_archive: gcc-3.2.3-linux* test_contained_class_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_contained_class_xml_warchive: gcc-3.2.3-linux* test_contained_class_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_cyclic_ptrs_binary_archive: gcc-3.2.3-linux* test_cyclic_ptrs_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_cyclic_ptrs_text_archive: gcc-3.2.3-linux* test_cyclic_ptrs_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_cyclic_ptrs_text_warchive: gcc-3.2.3-linux* test_cyclic_ptrs_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_cyclic_ptrs_xml_archive: gcc-3.2.3-linux* test_cyclic_ptrs_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_cyclic_ptrs_xml_warchive: gcc-3.2.3-linux* test_cyclic_ptrs_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_delete_pointer_binary_archive: gcc-3.2.3-linux* test_delete_pointer_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_delete_pointer_text_archive: gcc-3.2.3-linux* test_delete_pointer_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_delete_pointer_text_warchive: gcc-3.2.3-linux* test_delete_pointer_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_delete_pointer_xml_archive: gcc-3.2.3-linux* test_delete_pointer_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_delete_pointer_xml_warchive: gcc-3.2.3-linux* test_delete_pointer_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_demo: gcc-3.2.3-linux* test_demo_auto_ptr: gcc-3.2.3-linux* test_demo_auto_ptr_dll: cw-9_4 gcc-3.2.3-linux* test_demo_dll: gcc-3.2.3-linux* test_demo_exception: gcc-3.2.3-linux* test_demo_exception_dll: gcc-3.2.3-linux* test_demo_fast_archive: gcc-3.2.3-linux* test_demo_fast_archive_dll: cw-9_4 gcc-3.2.3-linux* test_demo_pimpl: gcc-3.2.3-linux* test_demo_pimpl_dll: cw-9_4 gcc-3.2.3-linux* test_demo_polymorphic: gcc-3.2.3-linux* test_demo_polymorphic_dll: cw-9_4 gcc-3.2.3-linux* test_demo_portable_archive: gcc-3.2.3-linux* test_demo_portable_archive_dll: cw-9_4 gcc-3.2.3-linux* test_demo_shared_ptr: gcc-3.2.3-linux* test_demo_shared_ptr_dll: gcc-3.2.3-linux* test_demo_xml: gcc-3.2.3-linux* test_demo_xml_dll: gcc-3.2.3-linux* test_demo_xml_load: gcc-3.2.3-linux* test_demo_xml_load_dll: gcc-3.2.3-linux* test_demo_xml_save: gcc-3.2.3-linux* test_demo_xml_save_dll: gcc-3.2.3-linux* test_deque_binary_archive: gcc-3.2.3-linux* test_deque_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_deque_text_archive: gcc-3.2.3-linux* test_deque_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_deque_text_warchive: gcc-3.2.3-linux* test_deque_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_deque_xml_archive: gcc-3.2.3-linux* test_deque_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_deque_xml_warchive: gcc-3.2.3-linux* test_deque_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_binary_archive: gcc-3.2.3-linux* test_derived_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_binary_archive: gcc-3.2.3-linux* test_derived_class_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_ptr_binary_archive: gcc-3.2.3-linux* test_derived_class_ptr_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_ptr_text_archive: gcc-3.2.3-linux* test_derived_class_ptr_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_ptr_text_warchive: gcc-3.2.3-linux* test_derived_class_ptr_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_ptr_xml_archive: gcc-3.2.3-linux* test_derived_class_ptr_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_ptr_xml_warchive: gcc-3.2.3-linux* test_derived_class_ptr_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_text_archive: gcc-3.2.3-linux* test_derived_class_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_text_warchive: gcc-3.2.3-linux* test_derived_class_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_xml_archive: gcc-3.2.3-linux* test_derived_class_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_class_xml_warchive: gcc-3.2.3-linux* test_derived_class_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_text_archive: gcc-3.2.3-linux* test_derived_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_text_warchive: gcc-3.2.3-linux* test_derived_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_xml_archive: gcc-3.2.3-linux* test_derived_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_derived_xml_warchive: gcc-3.2.3-linux* test_derived_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_diamond_binary_archive: gcc-3.2.3-linux* test_diamond_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_diamond_text_archive: gcc-3.2.3-linux* test_diamond_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_diamond_text_warchive: gcc-3.2.3-linux* test_diamond_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_diamond_xml_archive: gcc-3.2.3-linux* test_diamond_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_diamond_xml_warchive: gcc-3.2.3-linux* test_diamond_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_exported_binary_archive: gcc-3.2.3-linux* test_exported_binary_archive_dll: gcc-3.2.3-linux* test_exported_text_archive: gcc-3.2.3-linux* test_exported_text_archive_dll: gcc-3.2.3-linux* test_exported_text_warchive: gcc-3.2.3-linux* test_exported_text_warchive_dll: gcc-3.2.3-linux* test_exported_xml_archive: gcc-3.2.3-linux* test_exported_xml_archive_dll: gcc-3.2.3-linux* test_exported_xml_warchive: gcc-3.2.3-linux* test_exported_xml_warchive_dll: gcc-3.2.3-linux* test_list_binary_archive: gcc-3.2.3-linux* test_list_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_list_ptrs_binary_archive: gcc-3.2.3-linux* test_list_ptrs_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_list_ptrs_text_archive: gcc-3.2.3-linux* test_list_ptrs_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_list_ptrs_text_warchive: gcc-3.2.3-linux* test_list_ptrs_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_list_ptrs_xml_archive: gcc-3.2.3-linux* test_list_ptrs_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_list_ptrs_xml_warchive: gcc-3.2.3-linux* test_list_ptrs_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_list_text_archive: gcc-3.2.3-linux* test_list_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_list_text_warchive: gcc-3.2.3-linux* test_list_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_list_xml_archive: gcc-3.2.3-linux* test_list_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_list_xml_warchive: gcc-3.2.3-linux* test_list_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_map_binary_archive: gcc-3.2.3-linux* test_map_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_map_text_archive: gcc-3.2.3-linux* test_map_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_map_text_warchive: gcc-3.2.3-linux* test_map_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_map_xml_archive: gcc-3.2.3-linux* test_map_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_map_xml_warchive: gcc-3.2.3-linux* test_map_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_mi_binary_archive: gcc-3.2.3-linux* test_mi_binary_archive_dll: gcc-3.2.3-linux* test_mi_text_archive: gcc-3.2.3-linux* test_mi_text_archive_dll: gcc-3.2.3-linux* test_mi_text_warchive: gcc-3.2.3-linux* test_mi_text_warchive_dll: gcc-3.2.3-linux* test_mi_xml_archive: gcc-3.2.3-linux* test_mi_xml_archive_dll: gcc-3.2.3-linux* test_mi_xml_warchive: gcc-3.2.3-linux* test_mi_xml_warchive_dll: gcc-3.2.3-linux* test_mult_archive_types: gcc-3.2.3-linux* test_mult_archive_types_dll: gcc-3.2.3-linux* test_multiple_ptrs_binary_archive: gcc-3.2.3-linux* test_multiple_ptrs_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_multiple_ptrs_text_archive: gcc-3.2.3-linux* test_multiple_ptrs_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_multiple_ptrs_text_warchive: gcc-3.2.3-linux* test_multiple_ptrs_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_multiple_ptrs_xml_archive: gcc-3.2.3-linux* test_multiple_ptrs_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_multiple_ptrs_xml_warchive: gcc-3.2.3-linux* test_multiple_ptrs_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_no_rtti_binary_archive: gcc-3.2.3-linux* test_no_rtti_binary_archive_dll: gcc-3.2.3-linux* test_no_rtti_text_archive: gcc-3.2.3-linux* test_no_rtti_text_archive_dll: gcc-3.2.3-linux* test_no_rtti_text_warchive: gcc-3.2.3-linux* test_no_rtti_text_warchive_dll: gcc-3.2.3-linux* test_no_rtti_xml_archive: gcc-3.2.3-linux* test_no_rtti_xml_archive_dll: gcc-3.2.3-linux* test_no_rtti_xml_warchive: gcc-3.2.3-linux* test_no_rtti_xml_warchive_dll: gcc-3.2.3-linux* test_non_default_ctor2_binary_archive: gcc-3.2.3-linux* test_non_default_ctor2_binary_archive_dll: gcc-3.2.3-linux* test_non_default_ctor2_text_archive: gcc-3.2.3-linux* test_non_default_ctor2_text_archive_dll: gcc-3.2.3-linux* test_non_default_ctor2_text_warchive: gcc-3.2.3-linux* test_non_default_ctor2_text_warchive_dll: gcc-3.2.3-linux* test_non_default_ctor2_xml_archive: gcc-3.2.3-linux* test_non_default_ctor2_xml_archive_dll: gcc-3.2.3-linux* test_non_default_ctor2_xml_warchive: gcc-3.2.3-linux* test_non_default_ctor2_xml_warchive_dll: gcc-3.2.3-linux* test_non_default_ctor_binary_archive: gcc-3.2.3-linux* test_non_default_ctor_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_non_default_ctor_text_archive: gcc-3.2.3-linux* test_non_default_ctor_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_non_default_ctor_text_warchive: gcc-3.2.3-linux* test_non_default_ctor_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_non_default_ctor_xml_archive: gcc-3.2.3-linux* test_non_default_ctor_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_non_default_ctor_xml_warchive: gcc-3.2.3-linux* test_non_default_ctor_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_non_intrusive_binary_archive: gcc-3.2.3-linux* test_non_intrusive_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_non_intrusive_text_archive: gcc-3.2.3-linux* test_non_intrusive_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_non_intrusive_text_warchive: gcc-3.2.3-linux* test_non_intrusive_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_non_intrusive_xml_archive: gcc-3.2.3-linux* test_non_intrusive_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_non_intrusive_xml_warchive: gcc-3.2.3-linux* test_non_intrusive_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_null_ptr_binary_archive: gcc-3.2.3-linux* test_null_ptr_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_null_ptr_text_archive: gcc-3.2.3-linux* test_null_ptr_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_null_ptr_text_warchive: gcc-3.2.3-linux* test_null_ptr_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_null_ptr_xml_archive: gcc-3.2.3-linux* test_null_ptr_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_null_ptr_xml_warchive: gcc-3.2.3-linux* test_null_ptr_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_nvp_binary_archive: gcc-3.2.3-linux* test_nvp_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_nvp_text_archive: gcc-3.2.3-linux* test_nvp_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_nvp_text_warchive: gcc-3.2.3-linux* test_nvp_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_nvp_xml_archive: gcc-3.2.3-linux* test_nvp_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_nvp_xml_warchive: gcc-3.2.3-linux* test_nvp_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_object_binary_archive: gcc-3.2.3-linux* test_object_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_object_text_archive: gcc-3.2.3-linux* test_object_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_object_text_warchive: gcc-3.2.3-linux* test_object_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_object_xml_archive: gcc-3.2.3-linux* test_object_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_object_xml_warchive: gcc-3.2.3-linux* test_object_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_optional_binary_archive: gcc-3.2.3-linux* test_optional_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_optional_text_archive: gcc-3.2.3-linux* test_optional_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_optional_text_warchive: gcc-3.2.3-linux* test_optional_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_optional_xml_archive: gcc-3.2.3-linux* test_optional_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_optional_xml_warchive: gcc-3.2.3-linux* test_optional_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_polymorphic_binary_archive: gcc-3.2.3-linux* test_polymorphic_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_polymorphic_text_archive: gcc-3.2.3-linux* test_polymorphic_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_polymorphic_text_warchive: gcc-3.2.3-linux* test_polymorphic_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_polymorphic_xml_archive: gcc-3.2.3-linux* test_polymorphic_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_polymorphic_xml_warchive: gcc-3.2.3-linux* test_polymorphic_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_primitive_binary_archive: gcc-3.2.3-linux* test_primitive_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_primitive_text_archive: gcc-3.2.3-linux* test_primitive_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_primitive_text_warchive: gcc-3.2.3-linux* test_primitive_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_primitive_xml_archive: gcc-3.2.3-linux* test_primitive_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_primitive_xml_warchive: gcc-3.2.3-linux* test_primitive_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_private_ctor: gcc-3.2.3-linux* test_private_ctor_dll: cw-9_4 gcc-3.2.3-linux* test_recursion_binary_archive: gcc-3.2.3-linux* test_recursion_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_recursion_text_archive: gcc-3.2.3-linux* test_recursion_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_recursion_text_warchive: gcc-3.2.3-linux* test_recursion_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_recursion_xml_archive: gcc-3.2.3-linux* test_recursion_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_recursion_xml_warchive: gcc-3.2.3-linux* test_recursion_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_registered_binary_archive: gcc-3.2.3-linux* test_registered_binary_archive_dll: gcc-3.2.3-linux* test_registered_text_archive: gcc-3.2.3-linux* test_registered_text_archive_dll: gcc-3.2.3-linux* test_registered_text_warchive: gcc-3.2.3-linux* test_registered_text_warchive_dll: gcc-3.2.3-linux* test_registered_xml_archive: gcc-3.2.3-linux* test_registered_xml_archive_dll: gcc-3.2.3-linux* test_registered_xml_warchive: gcc-3.2.3-linux* test_registered_xml_warchive_dll: gcc-3.2.3-linux* test_reset_object_address: gcc-3.2.3-linux* test_reset_object_address_dll: cw-9_4 gcc-3.2.3-linux* test_set_binary_archive: gcc-3.2.3-linux* test_set_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_set_text_archive: gcc-3.2.3-linux* test_set_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_set_text_warchive: gcc-3.2.3-linux* test_set_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_set_xml_archive: gcc-3.2.3-linux* test_set_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_set_xml_warchive: gcc-3.2.3-linux* test_set_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_shared_ptr_132_binary_archive: gcc-3.2.3-linux* test_shared_ptr_132_binary_archive_dll: gcc-3.2.3-linux* test_shared_ptr_132_text_archive: gcc-3.2.3-linux* test_shared_ptr_132_text_archive_dll: gcc-3.2.3-linux* test_shared_ptr_132_text_warchive: gcc-3.2.3-linux* test_shared_ptr_132_text_warchive_dll: gcc-3.2.3-linux* test_shared_ptr_132_xml_archive: gcc-3.2.3-linux* test_shared_ptr_132_xml_archive_dll: gcc-3.2.3-linux* test_shared_ptr_132_xml_warchive: gcc-3.2.3-linux* test_shared_ptr_132_xml_warchive_dll: gcc-3.2.3-linux* test_shared_ptr_binary_archive: gcc-3.2.3-linux* test_shared_ptr_binary_archive_dll: gcc-3.2.3-linux* test_shared_ptr_text_archive: gcc-3.2.3-linux* test_shared_ptr_text_archive_dll: gcc-3.2.3-linux* test_shared_ptr_text_warchive: gcc-3.2.3-linux* test_shared_ptr_text_warchive_dll: gcc-3.2.3-linux* test_shared_ptr_xml_archive: gcc-3.2.3-linux* test_shared_ptr_xml_archive_dll: gcc-3.2.3-linux* test_shared_ptr_xml_warchive: gcc-3.2.3-linux* test_shared_ptr_xml_warchive_dll: gcc-3.2.3-linux* test_simple_class_binary_archive: gcc-3.2.3-linux* test_simple_class_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_ptr_binary_archive: gcc-3.2.3-linux* test_simple_class_ptr_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_ptr_text_archive: gcc-3.2.3-linux* test_simple_class_ptr_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_ptr_text_warchive: gcc-3.2.3-linux* test_simple_class_ptr_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_ptr_xml_archive: gcc-3.2.3-linux* test_simple_class_ptr_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_ptr_xml_warchive: gcc-3.2.3-linux* test_simple_class_ptr_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_text_archive: gcc-3.2.3-linux* test_simple_class_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_text_warchive: gcc-3.2.3-linux* test_simple_class_text_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_xml_archive: gcc-3.2.3-linux* test_simple_class_xml_archive_dll: cw-9_4 gcc-3.2.3-linux* test_simple_class_xml_warchive: gcc-3.2.3-linux* test_simple_class_xml_warchive_dll: cw-9_4 gcc-3.2.3-linux* test_split_binary_archive: gcc-3.2.3-linux* test_split_binary_archive_dll: cw-9_4 gcc-3.2.3-linux* test_split_text_archive: gcc-3.2.3-linux* test_split_text_archive_dll: cw-9_4 gcc-3.2.3-linux* test_split_text_warchive: gcc-3.2.3-linux* test_split_text_warchive_dll: 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Re: [boost] Performance comparison between ptr_vectorandvector<cow_ptr<Shape> >, vector<copy_ptr<Shape> >
by David Maisonave 06 Jan '06

06 Jan '06

"Thorsten Ottosen" <tottosen(a)dezide.com> wrote in message news:<dpm9i3$4q4$1(a)sea.gmane.org>... > David Maisonave wrote: > > "Sam Partington" <sam.partington(a)gmail.com> wrote in message > > news:<546fdb840601060205w76ed8be9n2bf73c4323c78c20(a)mail.gmail.com>.. > > . > > >>I don't agree with that. The clone concept is a well established > >>idiom for polymorphic types. Sure missing out a clone _does_ lead to > >>slicing, but that is understood, and as Thorsten says we can help > >>check for that with an assert. We can only help the user to get it > >>write, we can't do it all for them. > >> > > > > > > The cow_ptr and the copy_ptr can use the same assert code to catch > > slicing. The assert logic can be placed in the constructor of the > > cow_ptr and copy_ptr. > > This would make it easier to catch slicing in the cow_ptr/copw_ptr > > *than* it would be in the boost pointer containers. > > That's because in the boost pointer containers you would only catch > > slicing via assert if and when the object is clone. > > If the object never gets clone during testing, you would never catch the > > slicing. > > > > > > > > With cow_ptr/copy_ptr the slicing would be caught when the object > > gets instantiated. So you have a much higher probability of catching > > slicing using the cow_ptr clone method, *than* you would using the > > boost pointer container method. > > I'm not sure I fully understand how the detection mechanism would work > in your cow_ptr. Example code: template<typename T_obj> cow_ptr(T_obj* type): m_ref_count(new ref_count(type, get_alloc_func(type))) { assert(typeid(*type) == typeid(T_obj)); } Since the cow_ptr works by capturing the type on the constructor, it can easily determine if the right type is being passed in, and if it matches the pointee type. That can't be done with the boost pointer containers because they don't catch the type on the constructor, nor is it part of the required logic for using a clone function method. > > Nevertheless, as soon as the object is outside > a cow_ptr might be sliced. That's reason enough not to allow it. I'm not sure what you're referring to here. Can you post an example?

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Re: [boost] Performance comparison between ptr_vectorandvector<cow_ptr<Shape> >, vector<copy_ptr<Shape> >
by David Maisonave 06 Jan '06

06 Jan '06

"Sam Partington" <sam.partington(a)gmail.com> wrote in message news:<546fdb840601060205w76ed8be9n2bf73c4323c78c20(a)mail.gmail.com>... > On 1/5/06, David Maisonave <dmaisonave(a)commvault.com> wrote: > > > It seems to me that the first has the disadvantage of making it > > > relatively easy to provide an incorrect cloner that allows > > > slicing. However this is relatively easy to avoid by making your > > > hierarchy noncopyable, (Perhaps a way around this is to remove the > > > default implementation of new_clone?) > > > > Sorry Sam, but that's incorrect. > > As I posted in one of my previous examples, the noncopyable method > > does not work on pointer idioms. Noncopyable is for preventing > > slicing via concrete types. Noncopyable does not help for cloning. > > Since using the clone function method requires adding additional code > > for each new type, this increases the chances of slicing. > > And therefore (IMHO) it's easier to introduce bugs using this method. > > I don't agree with that. The clone concept is a well established > idiom for polymorphic types. Sure missing out a clone _does_ lead to > slicing, but that is understood, and as Thorsten says we can help > check for that with an assert. We can only help the user to get it > write, we can't do it all for them. > The cow_ptr and the copy_ptr can use the same assert code to catch slicing. The assert logic can be placed in the constructor of the cow_ptr and copy_ptr. This would make it easier to catch slicing in the cow_ptr/copw_ptr *than* it would be in the boost pointer containers. That's because in the boost pointer containers you would only catch slicing via assert if and when the object is clone. If the object never gets clone during testing, you would never catch the slicing. With cow_ptr/copy_ptr the slicing would be caught when the object gets instantiated. So you have a much higher probability of catching slicing using the cow_ptr clone method, *than* you would using the boost pointer container method. It's possible that the boost pointer containers could catch some of the slicing issues at compile time, if it new the name of the T::Clone function. If the boost pointer containers cought the type in the constructor, it could *than* do a test for T::my_clone_function. This could catch it if the correct type is being passed in, but again would still fail if being passed in via base type or parent derived type. Any way, it's food for thought.

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