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

Solaris versions of sp_counted_base and atomic_count by Michael van der Westhuizen
by Peter Dimov 13 Jul '06

13 Jul '06

Michael van der Westhuizen has generously contributed Solaris versions of atomic_count and sp_counted_base. You can find them in the CVS HEAD and as attachments to this message. I haven't applied his patch (also attached) to atomic_count.hpp and sp_counted_base.hpp that would enable them yet, but I plan do so in a couple of days if there are no objections. If you have any suggestions or comments, please let me know; in particular, if you have a better idea how to detect SunOS 5.10 or later, or if you know what memory synchronization guarantees the Solaris atomics are supposed to provide. :-) Thanks in advance for any help or interest, and of course, big thanks to Michael for his contribution.

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iterator_facade and InputIterators
by Richard Smith 13 Jul '06

13 Jul '06

The Standard's table of InputIterator requirements (table 72 in section 24.1) says that, amongst other things, an InputIterator must support the following two expressions: *a Convertible to T, the iterator's value_type a->m Equivalent to (*a).m The same language is present in the "New Iterator Concepts", N1550, documentation in the definition of ReadableIterator. In particular, InputIterators are allowed to, and often do, have operator* returning by value: template <typename T> class my_iterator { public: typedef T value_type; T operator*() const; // ... }; Because it is legal to call non-const member functions on temporary objects, it is legal to call non-const member functions on the value returned from operator*: struct foo { void non_const(); }; my_iterator<foo> i; (*i).non_const(); My reading of Table 72 documentation suggests that this means that for my_iterator<foo> to be a Readable Iterator, it must also be legal to write: i->non_const(); If so, this means that operator-> should return T* instead of T const* (possibly via a proxy class). In the current implementation of boost::iterator_facade, operator-> returns a proxy that acts as a T const*: template <class T> struct operator_arrow_proxy { operator_arrow_proxy(T const* px) : m_value(*px) {} const T* operator->() const { return &m_value; } operator const T*() const { return &m_value; } T m_value; }; Is there a reason not to change this to have operator-> returning a T*? That would seem closer to the defintion of an InputIterator. (I supposed that if operator* returns by const value, it would be necessary to resurrect the constness in the proxy, but assuming the iterator's reference typedef is also a const-qualified value, this should be easy enough.) I had a look at the current concept-based iterator proposal, N2039, to see whether that shed any light on this and it also seems to require this behaviour from an InputIterator. It formal concept only requires operator->'s return to be convertible to T const* (which T*, or a proxy to T*, is): concept InputIterator<typename X> { where /*...*/ Convertible<pointer, value_type const*>; pointer operator->(X); // } And in it's definition of operator->, it requires (*a).m to be well-formed and then defines a->m to be equivalent to it. Have I misunderstood some aspect of this, or does the Standard really all require that a generic input iterator adaptor, such as boost::iterator_adaptor (and by impliciation boost::iterator_facade) should support this? -- Richard Smith

2 3

[BGL] Search Algrorithms' Behavior
by Wang Weiwei 13 Jul '06

13 Jul '06

Hello, I have an undirected graph with several isolated (unconnected) sub-graphs. For example Vertex {1, 2, 3, 4, 5} Edge {(1,2), (1,3) (4, 5)} I want to know what will be the behavior of the search algorithms (such as DFS, BFS, or undirected_DFS) when I submit a search call with a specified beginning vertex. As a result, all of the verteces will be visited, or just those topologically connected to the input vertex? Any help will be appreciated. Max

2 1

[signals] slots bug?
by Bruno Martínez 13 Jul '06

13 Jul '06

Hello. Investigating a problem Elisabeth Benoit was having at the users mailing list I've come to this code, that doesn't work as I would expect: #include <boost/signal.hpp> #include <iostream> void func() { std::cout << "pp\n"; } int main() { boost::signal0<void> signal1; boost::signal0<void> signal2; boost::signal0<void>::slot_type slot = &func; boost::signals::connection conn = signal1.connect(slot); signal2.connect(slot); conn.disconnect(); signal2(); } The func() free function is only called once, because disconnect() removes the slot from both signals. I'm not sure if this is a bug, but I would expect slot_type to work as boost::function. Regards, Bruno

1 0

boost.org and www
by Gennaro Prota 13 Jul '06

13 Jul '06

Just out of curiosity, I verified that boost.org qualifies as a "class A" domain name for http://no-www.org/index.php. I wonder: is it intentional that we always use "www" in our url references? -- [ Gennaro Prota, C++ developer for hire ] [ resume: available on request ]

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[signals] Bug in documentation
by Bruno Martínez 13 Jul '06

13 Jul '06

Hi. There's a bug in the tutorial. It says sig.connect(&print_sum); sig.connect(&print_product); sig.connect(&print_difference); sig.connect(&print_quotient); prints The sum is 8 The difference is 2 The product is 15 The quotient is 1.66667 when in fact it prints The sum is 8 The product is 15 The difference is 2 The quotient is 1.66667 because slots are called in FIFO order. Regards, Bruno

1 0

Tuples and Bind problem
by Arash Partow 13 Jul '06

13 Jul '06

Hi all, I'm having some difficulties getting the following piece of code to compile: #include <iostream> #include <vector> #include <boost/utility.hpp> #include <boost/bind.hpp> #include <boost/tuple/tuple.hpp> class AClass { public: AClass(){} void b(int i, int j, int k) { std:: cout << "a::b() - " << i << "\t" << j << "\t" << k << std::endl; } }; template <typename T,int i> class select { public: typedef typename boost::tuples::element<i,T>::type result_type; template <typename U> result_type operator()(const U& u) const { return u.get<i>(); } }; int main(int argc, char* argv[]) { typedef boost::tuples::tuple<AClass,int,int,int> param_set; std::vector<param_set> list; list.push_back(param_set(AClass(),1,2,3)); list.push_back(param_set(AClass(),2,3,4)); list.push_back(param_set(AClass(),3,4,5)); list.push_back(param_set(AClass(),4,5,6)); list.push_back(param_set(AClass(),5,6,7)); std::for_each( list.begin(), list.end(), boost::bind(&AClass::b, boost::bind(select<param_set,0>(),_0), boost::bind(select<param_set,0>(),_1), boost::bind(select<param_set,0>(),_2), boost::bind(select<param_set,0>(),_3))); return true; } Basically the "select class" is a code snippet I found on this list, the compilation errors I believe exist in how I'm calling bind, but I cant tell whats going wrong. Also I'm wondering is there a better way of doing what I'm trying to do, is there already a class or something in boost that will allow one to bind a function and a tuples of parameters. Also I'm wondering if it will be possible to derive AClass from boost::noncopyable and still be able to instantiate class instances as part of method parameters. Any help would be very much appreciated. Arash Partow ________________________________________________________ Be one who knows what they don't know, Instead of being one who knows not what they don't know, Thinking they know everything about all things. http://www.partow.net

2 1

Boost regression notification (2006-07-13 [RC_1_34_0])
by Douglas Gregor 13 Jul '06

13 Jul '06

Boost Regression test failures Report time: 2006-07-13T09:58:57Z This report lists all regression test failures on release platforms. Detailed report: http://engineering.meta-comm.com/boost-regression/CVS-RC_1_34_0/developer/i… 537 failures in 31 libraries algorithm/string (2) concept_check (1) conversion (1) date_time (1) filesystem (5) graph (6) integer (3) io (1) iostreams (61) iterator (1) lambda (2) mpl (20) numeric/conversion (4) numeric/interval (2) numeric/ublas (7) optional (2) parameter (33) pool (3) program_options (19) python (92) random (1) rational (5) serialization (177) signals (16) spirit (12) test (8) tr1 (39) typeof (9) utility (2) utility/enable_if (1) wave (1) |algorithm/string| regex: borland-5_6_4 replace: vc-7_1-stlport |concept_check| class_concept_check_test: vc-7_1-stlport |conversion| lexical_cast_test: sun-5.8 |date_time| testgreg_serialize_dll: mingw-3_4_2 |filesystem| fstream_test: sun-5.8 mbcopy: sun-5.8 operations_test: vc-7_1-stlport operations_test_dll: vc-7_1-stlport wide_test: sun-5.8 |graph| adjacency_matrix_test: vc-7_0 bidir_remove_edge: vc-7_0 csr_graph_test: sun-5.8 graphviz_test: msvc-8.0 msvc-8.0 vc-7_1-stlport |integer| integer_traits_test: qcc-3.3.5_gpp qcc-3.3.5_gpp qcc-3.3.5_gpp |io| ios_state_unit_test: gcc-4.1.0_linux_x86_64 |iostreams| array_test: vc-6_5 auto_close_test: sun-5.8 vc-6_5 buffer_size_test: sun-5.8 vc-6_5 bzip2_test: msvc-7.1 msvc-8.0 sun-5.8 code_converter_test: sun-5.8 vc-6_5 component_access_test: sun-5.8 vc-6_5 compose_test: borland-5_6_4 sun-5.8 vc-6_5 copy_test: vc-6_5 counter_test: sun-5.8 vc-6_5 direct_adapter_test: vc-6_5 example_test: vc-6_5 vc-6_5-stlport file_descriptor_test: vc-6_5 file_test: vc-6_5 filtering_stream_test: sun-5.8 vc-6_5 vc-7_1-stlport finite_state_filter_test: cw-9.4 sun-5.8 flush_test: sun-5.8 vc-6_5 gzip_test: msvc-7.1 msvc-8.0 sun-5.8 invert_test: vc-6_5 line_filter_test: sun-5.8 vc-6_5 mapped_file_test: vc-6_5 newline_test: sun-5.8 vc-6_5 null_test: vc-6_5 pipeline_test: sun-5.8 vc-6_5 positioning_test: vc-6_5 regex_filter_test: sun-5.8 vc-6_5 restrict_test: sun-5.8 vc-6_5 seekable_file_test: sun-5.8 vc-6_5 seekable_filter_test: sun-5.8 vc-6_5 stdio_filter_test: sun-5.8 vc-6_5 symmetric_filter_test: sun-5.8 vc-6_5 tee_test: sun-5.8 vc-6_5 wide_stream_test: sun-5.8 vc-6_5 zlib_test: msvc-7.1 msvc-8.0 |iterator| is_lvalue_iterator: sun-5.8 |lambda| extending_rt_traits: sun-5.8 operator_tests_simple: sun-5.8 |mpl| apply: gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc sun-5.8 count: sun-5.8 count_if: sun-5.8 equal: sun-5.8 erase: sun-5.8 find: sun-5.8 insert: sun-5.8 insert_range: sun-5.8 lambda_args: sun-5.8 multiset: gcc-3.4.5_linux_x86_64 gcc-4.0.3_linux gcc-4.1.0_linux gcc-4.1.0_linux_x86_64 gcc-4.1.1_sunos_i86pc gcc-4_0_3_tru64 partition: sun-5.8 stable_partition: sun-5.8 vector_c: sun-5.8 |numeric/conversion| converter_test: borland-5_8_2 traits_test: borland-5_8_2 udt_example_0: borland-5_8_2 udt_support_test: borland-5_8_2 |numeric/interval| det: sun-5.8 test_float: vc-7_1-stlport |numeric/ublas| concepts: vc-7_1-stlport vc-7_1-stlport test1: vc-7_1-stlport test2: vc-7_1-stlport test4: vc-7_1-stlport test5: vc-7_1-stlport vc-7_1-stlport |optional| optional_test: sun-5.8 optional_test_ref: sun-5.8 |parameter| basics: borland-5_6_4 borland-5_8_2 sun-5.8 duplicates: borland-5_6_4 borland-5_8_2 earwicker: borland-5_6_4 borland-5_8_2 macros: borland-5_6_4 borland-5_8_2 sun-5.8 maybe: vc-6_5 vc-6_5-stlport vc-7_0 mpl: borland-5_6_4 borland-5_8_2 preprocessor: borland-5_6_4 borland-5_8_2 sun-5.8 vc-6_5 vc-6_5-stlport python-parameter-test: vc-6_5 vc-6_5-stlport vc-7_0 sfinae: borland-5_6_4 borland-5_8_2 vc-6_5-stlport singular: borland-5_6_4 borland-5_8_2 unnamed: borland-5_6_4 borland-5_8_2 unnamed_fail: vc-6_5 vc-6_5-stlport vc-7_0 |pool| test_pool_alloc: qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_cpp |program_options| cmdline_test: sun-5.8 cmdline_test_dll: cw-9.4 sun-5.8 options_description_test: sun-5.8 options_description_test_dll: cw-9.4 sun-5.8 parsers_test: sun-5.8 parsers_test_dll: cw-9.4 sun-5.8 positional_options_test: sun-5.8 positional_options_test_dll: cw-9.4 sun-5.8 unicode_test_dll: borland-5_8_2 cw-9.4 variable_map_test: sun-5.8 variable_map_test_dll: borland-5_8_2 cw-9.4 sun-5.8 winmain_dll: cw-9.4 |python| andreas_beyer: sun-5.8 args: sun-5.8 auto_ptr: sun-5.8 back_reference: sun-5.8 bases: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux sun-5.8 ben_scott1: sun-5.8 bienstman1: sun-5.8 bienstman2: sun-5.8 bienstman3: sun-5.8 borrowed: sun-5.8 callbacks: sun-5.8 const_argument: sun-5.8 crossmod_exception: sun-5.8 data_members: sun-5.8 defaults: sun-5.8 dict: sun-5.8 docstring: sun-5.8 enum: sun-5.8 exception_translator: sun-5.8 exec: cw-9.4 darwin-4.0.1 gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux msvc-8.0 qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_gpp qcc-3.3.5_gpp sun-5.8 extract: sun-5.8 implicit: sun-5.8 indirect_traits_test: sun-5.8 injected: sun-5.8 iterator: sun-5.8 keywords: sun-5.8 list: sun-5.8 long: sun-5.8 minimal: sun-5.8 multi_arg_constructor: sun-5.8 nested: sun-5.8 numpy: sun-5.8 object: sun-5.8 object_manager: sun-5.8 opaque: sun-5.8 operators: sun-5.8 pearu1: sun-5.8 pickle1: sun-5.8 pickle2: sun-5.8 pickle3: sun-5.8 pickle4: sun-5.8 pointee: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux sun-5.8 pointer_type_id_test: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux sun-5.8 pointer_vector: sun-5.8 polymorphism: sun-5.8 polymorphism2: sun-5.8 polymorphism2_auto_ptr: sun-5.8 properties: sun-5.8 raw_ctor: sun-5.8 return_arg: sun-5.8 select_arg_to_python_test: sun-5.8 select_from_python_test: darwin-4.0.1 qcc-3.3.5_cpp qcc-3.3.5_gpp sun-5.8 select_holder: sun-5.8 shared_ptr: sun-5.8 slice: sun-5.8 staticmethod: sun-5.8 stl_iterator: sun-5.8 str: sun-5.8 string_literal: sun-5.8 test_pointer_adoption: sun-5.8 try: sun-5.8 tuple: sun-5.8 upcast: gcc-3.2.3_linux gcc-3.3.6_linux gcc-3.4.5_linux sun-5.8 vector_indexing_suite: sun-5.8 virtual_functions: sun-5.8 voidptr: sun-5.8 wrapper_held_type: sun-5.8 |random| random_test: intel-linux-9.0 |rational| rational_test: borland-5_6_4 sun-5.8 vc-6_5 vc-6_5-stlport vc-7_0 |serialization| test_array_binary_archive_dll: mingw-3_4_2 test_array_text_archive_dll: mingw-3_4_2 test_array_xml_archive_dll: mingw-3_4_2 test_binary_binary_archive_dll: mingw-3_4_2 test_binary_text_archive_dll: mingw-3_4_2 test_binary_xml_archive_dll: mingw-3_4_2 test_class_info_load_binary_archive_dll: mingw-3_4_2 test_class_info_load_text_archive_dll: mingw-3_4_2 test_class_info_load_text_warchive: vc-6_5 test_class_info_load_xml_archive_dll: mingw-3_4_2 test_class_info_save_binary_archive_dll: mingw-3_4_2 test_class_info_save_text_archive_dll: mingw-3_4_2 test_class_info_save_xml_archive_dll: mingw-3_4_2 test_codecvt_null: qcc-3.3.5_gpp qcc-3.3.5_gpp qcc-3.3.5_gpp test_contained_class_binary_archive_dll: mingw-3_4_2 test_contained_class_text_archive_dll: mingw-3_4_2 test_contained_class_xml_archive_dll: mingw-3_4_2 test_cyclic_ptrs_binary_archive_dll: mingw-3_4_2 test_cyclic_ptrs_text_archive_dll: mingw-3_4_2 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mingw-3_4_2 test_variant_xml_archive: borland-5_8_2 test_variant_xml_archive_dll: borland-5_8_2 mingw-3_4_2 test_variant_xml_warchive: borland-5_8_2 test_variant_xml_warchive_dll: borland-5_8_2 test_vector_binary_archive_dll: mingw-3_4_2 test_vector_text_archive_dll: mingw-3_4_2 test_vector_xml_archive_dll: mingw-3_4_2 test_void_cast_dll: mingw-3_4_2 |signals| dead_slot_test: gcc-3.3.6 gcc-3.3.6_linux qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_gpp qcc-3.3.5_gpp qcc-3.3.5_gpp trackable_test: gcc-3.3.6 gcc-3.3.6_linux qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_cpp qcc-3.3.5_gpp qcc-3.3.5_gpp qcc-3.3.5_gpp |spirit| bug_fixes: sun-5.8 bug_fixes_debug: sun-5.8 char_strings_test: sun-5.8 char_strings_test_debug: sun-5.8 epsilon_tests: sun-5.8 epsilon_tests_debug: sun-5.8 file_iterator_tests: sun-5.8 file_iterator_tests_debug: sun-5.8 if_p_as_parser_tests: sun-5.8 mix_and_match_trees: sun-5.8 scanner_value_type_tests: intel-linux-9.0 while_p_as_parser_tests: sun-5.8 |test| 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SuperString v2 in the vault
by Jeff Garland 13 Jul '06

13 Jul '06

Thanks all for the discussion/suggestions on the first version. As usual Boosters have very helpful suggestions. I've uploaded version 2 of super_string to the vault and put an improved set of documentation online: http://www.crystalclearsoftware.com/libraries/super_string/index.html Vault location: http://tinyurl.com/dbcye Probably the biggest thing in this version is an immutable version using the proposed boost::const_string. http://www.crystalclearsoftware.com/libraries/super_string/classbasic__cons… After using it a bit, it seems to me that the immutable approach is likely viable for most applications. To see the impact, I wrote a little performance test. On mutating operations const_super_string is clearly slower. The benefit on non-mutating operations is minimal. However, this version is probably not as optimized as possible and it under emphasizes allocation, so I expect in actual practice the mutable version may better than these tests demonstrate. Your mileage may vary. 10 trials 500000 iterations/trial const append test --> total elapsed: 00:00:25.071687 mutable append test --> total elapsed: 00:00:21.904486 10 trials 1000000 iterations/trial const trim test --> total elapsed: 00:00:14.977803 mutable trim test --> total elapsed: 00:00:11.693688 10 trials 100000 iterations/trial const contains regex test --> total elapsed: 00:00:27.044718 mutable contains regex test --> total elapsed: 00:00:27.633608 10 trials 100000 iterations/trial const split regex test --> total elapsed: 00:00:16.517079 mutable split regex test --> total elapsed: 00:00:17.582708 Other notable changes in this version: * Make modification functions chainable -- thanks Mark Mutz * Add append_file function -- Thx to suggestion by Pavel Vozenilek super_string data; data.append_file("data1.txt").append_file(data2.txt); * Type conversion with user supplied stringstream std::ostringstream ss; s.setprecision( super_string s; ss << std::setprecision(3); double dbl = 1.987654321; int i = 1000; s.append(dbl, i, i, " stuff", dbl, ss); //s == "1.99 1000 1000 1.99 stuff 1.99" //ss -- has been modified * Add boost.format capabilities -- Thx to suggestion by Pavel Vozenilek super_string s; double d = 1.123456789; int i = 1000; s.append_formatted(d, i , d, i, "a string", "%-7.2f %-7d %-7.2f %-7d %s"); //s == "1.12 1000 1.12 1000 a string" * Removed all const _copy overloads in mutable string to reduce the api size. * Add additional template overloads to support multi-append cases like double double d = 1.54; int i = 25; s.append("double: ", d, " is ", i); Currently up to 5 parameters Enjoy, Jeff

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[asio] has anybody enabled SSL in a large project?
by Scott 13 Jul '06

13 Jul '06

We've been using ASIO for a while now in a large project and it's been great. I've recently been tasked to add optional SSL support between our client and server. Since there are some SSL classes in ASIO I started with the ASIO SSL example code and got that working. I then pretty much copied the relevant pieces from the sample code over to our project to see if it would work there. Using the same certificates and key files from the sample code, I added the handshaking and got our client and server to communicate. It all seemed great at first, because it seemed to seemlessly work. But eventually the communications break down. I either get asserts in my code from unexpected data in the stream, or the client hangs waiting for data that never appears or any of several different stream problems. It's rarely the exact same thing. But it eventually always fails. Especially on long sustained transfers. I have no idea what I might be doing wrong. There's really no documentation at all on ASIO and SSL. For all I know, it might be a problem with the SSL implementation in ASIO. Which brings me to my question - has anybody successfully used the SSL classes in ASIO on complex projects? If so, that would point to a problem in my code somewhere. Perhaps I need to do more than just add the initial SSL handshake (aside from using the SSL stream beyond that point)? Thanks, Scott

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