June 2007 - Boost - lists.preview.boost.org

bug in either relaxed heap or dijkstra algorithm (or am I doing something wrong?)
by Buola Buola 02 Jul '07

02 Jul '07

I was getting an strange assertion failed using the dijkstra algorithm from the graph library. The line that fails with the assertion is line 175: assert(smallest_value->value != 0); I don't know how a relaxed heap works, but using assert(smallest_value!=0) would make more sense to me. My problem is that I am using the graph library with an adapted graph class, and I use the indices to some vector as vertex_descriptors, so there is one node with vertex_descriptor 0. The dijkstra algorithm uses the vertex descriptor as indices for the relaxes heap, and the assertion fails. Commenting out the assertion or changing it to what I wrote before (or, I guess, just defining NDEBUG), everything works just fine. Is there anyone who knows why this assertion is there and whether it can be safely removed? Thanks in advance, Xavi

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Boost.Proto
by David A. Greene 30 Jun '07

30 Jun '07

Saw this in Eric's blog post about BoostCon: > This morning, I publicly unveil Boost.Proto, a new library I’ve been > developing to help with the implementation of domain-specific embedded > languages Eric, have you got more info on this (some documentation, perhaps)? I've just come to a point in a project where something like this might be very useful. -Dave

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[proto]emulation of homomorphisms in hierarchical algebras (was in spirit-devl list
by Larry Evans 30 Jun '07

30 Jun '07

As Eric suggested below, this has been moved from spirit-devel at: http://thread.gmane.org/gmane.comp.parsers.spirit.devel/3200/focus=3211 On 06/25/2007 04:53 PM, Eric Niebler wrote: > (This seems to be drifting off-topic for this Spirit-devel list. Perhaps > we should move this discussion to the boost list.) > [snip] > Of course, ET transforms are not purely compile-time, or at least, they > don't have to be. They can have a run-time counterpart, too. I've added > some examples recently to demonstrate this. Have a look at the > CountLeaves transform at http://tinyurl.com/2qme82 for an example that > uses std::plus to accumulate a runtime value. Thanks Eric. I'll have a look. > > > However, I just thought I'd try and see if the >> lookaheaads could be calculated a compile time. That's what I >> attempted in: >> >> <boost-vault>/Strings - Text Proccesing/gram_lookahead.zip >> >> As the comments indicate, it's not completed. I ran against a problem >> with the first/follow attributes which is, I think, related to proto's >> terminals. If you recall, about a week or month ago, there was some >> discussion about the arity of proto terminals. You decided to change >> the arity to 0. This was good because it was consistent with the way >> algebra's and their morphisms are defined. However, in the case of >> gram_lookahead.zip, this lead to the aforementioned problem with >> first/follow calculation. > > > Which problem? > The problem involves my attempt to model the lookahead problem as an algebra problem whose solution involved the following steps. 1) For a grammar expression, e_gram, (a "source" algebra expression) perform a homomorphism, gram2X. to a corresponding target algebra, X, expression, e_X, where X is one of {empty,first,follow}. For example, gram2empty(inp | epsilon) = not_empty & yes_empty where inp is any element in the terminals of the grammar and epsilon is, of course, the epsilon expression representing the empty string. 2) Perform a sequence of reductions, based on "laws" of the target algebra, until a "constant" in the target algebra is reached. For example, some of the "laws" of the empty algebra are: not_empty & e_empty -reduce-> not_empty e_empty & not_empty -reduce-> not_empty where e_empty means any expression in the empty algebra. Based on this, and the example expression in 1): not_empty & yes_empty -reduce-> not_empty And not_empty is a "constant" in the empty algebra; do, the sequence of reductions is complete. Now, IIUC, a homomorphism maps functions with arity, n, in the source to functions with arity n in the target. Thus | in the gram algebra was mapped to & in empty algebra. If n = 0, this means constants in the source are mapped to cconstants in the target. For example, in the above example, inp_0, a constant in gram algebra was mapped to not_empty, a constant in the empty algebra. However, for gram2first, things aren't that simple. The constants in the first algebra are *sets* of constants in the gram algebra. More concretely: 1) homomorphism: gram2first 1.1) constants: gram2first(inp_0) = {inp_0} gram2first(inp_1) = {inp_1} ... gram2first(inp_n) = {inp_n} where n is the number of terminal symbols in the grammar. 1.2) binary |: gram2first(|) = \/ where \/ is set union operator or function. gram2first(e_gram_0 | e_gram_1) = gram2first(e_gram_0) \/ gram2first(e_gram_0) However, {inp_0} and {inp_1} and ... {inp_n} are not really a constants in the first grammar. Instead they are really composite terms or expressions in a multisorted set algebra with the single constant, empty_set, and binary function, insert: insert(empty_set,inp_0) insert(empty_set,inp_1) ... insert(empty_set,inp_n) and this is what lead me to look for something like the hierarchical algebra, which, I guess, is similar to the "hierarchical abstract type" in (6) here: http://tinyurl.com/ypekyd The type, P, in the above tinyurl corresponds to the multisorted set algebra mentioned above, and insert(empty_set,inp_0) would be an example of the "primitive term" mentioned in the tinyurl. > > In gram_lookahead.zip, the morphisms >> cannot proceed down the expression tree after a node with arity==0 is >> reached. > > > Huh, there is nothing "down" after a node with arity 0. That's all you > get. :-) > The above definition of homomorphism mapped constants (functions with arith=0) to constants. However, in the case of gram2first, the mapping was from constants to some term in the primitive subalgebra of the target algebra (I don't even know if that's been defined somewhere, but I'd be very surprised if there were'nt some reference somewhere defining the idea). So instead of mapping constants to constants, in proto I'd be mapping arity-0 terms to arity-0 terms; however, the contents of those target arity-0 terms would be the primitive subalgebra terms; hence, there would be a "down" to get at the subalgebra term (in this case, probably implemented as mpl::set<GrammarTerminalNumeral,TermNum>). > > However, with the first and follow algebra, the terminal >> values are not single values like true or false, but instead multiple >> values like {ident,value,lpar} (e.g. the first attribute of factor >> nonterminal in arith_expression grammar). > > > OK, so your terminal is a 3-tuple. It's still a terminal. > Yes, but also a composite term in the primitive subalgebra. Your probably wondering why I'm so fixated on using the algebra concepts and I'm beginning to wonder myself ;) . However, my original intent was to try and be more formal and possibly gain some insight about how to do it other ways. > > So, the reduction of values >> in this grammar must continue through the value contained in the proto >> terminal (which is an instance of mpl::set on grammar terminals, like >> ident, value, or lpar). > > > I don't think you need proto to "recurse" into your terminals. I just > think you need to write a custom transform that does something > appropriate with your terminals. > OK, you're probably right and the attempt at formality is not worth the effort. > > This lead me to search for something in >> algebra literature to handle this, and that lead to something called >> "heirarchical albebras" where the arity-0 expressions are actually >> values in some other algebra (if I'm interpresting things correctly). >> This sounds like what I was looking for. I would be interesting if >> the transforms in proto actually were more like heirarchical algebra >> morphisms. Just something to think about (probably in the distant >> future ;) ). > > > Well, that's one approach. In fact, you can approximate that in proto > today by wrapping a proto expression in a template, effectively hiding > its proto-ness from proto, which would then treat it like any other > terminal. You would be responsible for writing the transforms and/or > contexts that knew about these special terminals and recursed into them. > > OK, now you've inspired me to continue trying. Thanks for the feedback! -regards, Larry

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Boost inspection notification (2007-06-30/RC_1_34_0) *X*
by Rene Rivera 30 Jun '07

30 Jun '07

Boost Inspection Report Run Date: 16:05:18 UTC, Saturday 30 June 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11452 files scanned 909 directories scanned (including root) 165 problems reported Problem counts: 0 files with invalid line endings 0 bookmarks with invalid characters 3 invalid urls 70 broken links 24 unlinked files 22 file/directory names issues 2 files with tabs 9 violations of the Boost min/max guidelines 35 usages of unnamed namespaces in headers (including .ipp files) Summary: archive (3) bind (1) build (1) date_time (1) doc (3) filesystem (3) graph (3) iostreams (2) lambda (3) math (8) more (4) mpl (4) multi_array (2) ptr_container (1) python (8) regex (1) regression (32) serialization (1) smart_ptr (2) test (81) type_traits (1) Details: *R* invalid (cr only) line-ending *A* invalid bookmarks, invalid urls, broken links, unlinked files *N* file/directory names issues *T* tabs in file *M* uses of min or max that have not been protected from the min/max macros, or unallowed #undef-s *U* unnamed namespace in header |archive| boost/archive/basic_streambuf_locale_saver.hpp: 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Boost inspection notification (2007-06-30/RC_1_34_0) *LC*
by Rene Rivera 30 Jun '07

30 Jun '07

Boost Inspection Report Run Date: 16:05:25 UTC, Saturday 30 June 2007 An inspection program <http://www.boost.org/tools/inspect/index.html> checks each file in the current Boost CVS for various problems, generating this as output. Problems detected include tabs in files, missing copyrights, broken URL's, and similar misdemeanors. Totals: 11452 files scanned 909 directories scanned (including root) 1059 problems reported Problem counts: 661 files missing Boost license info or having wrong reference text 398 files missing copyright notice Summary: any (1) archive (1) build (68) concept_check (22) conversion (5) doc (1) filesystem (2) function (1) graph (1) inspect (1) integer (9) lambda (10) libs (6) logic (2) math (1) more (13) mpl (417) multi_array (13) numeric (188) optional (1) people (4) program_options (35) property_map (15) ptr_container (8) python (14) rational (5) regex (4) regression (118) release (2) serialization (16) signals (2) smart_ptr (8) test (3) timer (1) tr1 (2) tuple (5) utility (12) variant (42) Details: *L* missing Boost license info, or wrong reference text *C* missing copyright notice |any| libs/any/doc/ any.xml: *L* |archive| boost/archive/detail/ utf8_codecvt_facet.hpp: *L* |build| tools/build/v2/build/ build-request.jam: *L* modifiers.jam: *L* tools/build/v2/doc/ Jamfile.v2: *C* *L* 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[Report] 106 regressions on RC_1_34_0 (2007-06-30)
by Douglas Gregor 30 Jun '07

30 Jun '07

Boost Regression test failures Report time: 2007-06-29T23:23:22Z 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… 106 failures in 13 libraries config (1) conversion (1) functional/hash (2) math (3) parameter (13) ptr_container (4) python (65) rational (1) serialization (1) statechart (6) tr1 (3) wave (1) xpressive (5) |config| config_test: acc |conversion| numeric_cast_test: acc |functional/hash| hash_float_test: acc hash_number_test: acc |math| log1p_expm1_test: acc octonion_test: acc quaternion_test: acc |parameter| basics: acc compose: acc deduced: acc deduced_dependent_predicate: acc earwicker: acc efficiency: acc macros: acc normalized_argument_types: acc ntp: acc optional_deduced_sfinae: acc preprocessor_deduced: acc python_test: acc sfinae: acc |ptr_container| no_exceptions: acc ptr_deque: acc ptr_list: acc ptr_vector: acc |python| andreas_beyer: acc args: acc auto_ptr: acc back_reference: acc bases: acc ben_scott1: acc bienstman1: acc bienstman2: acc bienstman3: acc builtin_converters: acc callbacks: acc const_argument: acc crossmod_exception: acc crossmod_opaque: acc defaults: acc dict: acc docstring: acc enum: acc exception_translator: acc exec: acc exec-dynamic: acc extract: acc implicit: acc injected: acc iterator: acc keywords: acc list: acc long: acc map_indexing_suite: acc minimal: acc multi_arg_constructor: acc nested: acc numpy: acc object: acc opaque: acc operators: acc pearu1: acc pickle1: acc pickle2: acc pickle3: acc pickle4: acc pointee: acc pointer_type_id_test: acc pointer_vector: acc polymorphism: acc polymorphism2: acc polymorphism2_auto_ptr: acc properties: acc raw_ctor: acc return_arg: acc select_arg_to_python_test: acc select_holder: acc shared_ptr: acc slice: acc staticmethod: acc stl_iterator: acc str: acc test_pointer_adoption: acc try: acc tuple: acc upcast: acc vector_indexing_suite: acc virtual_functions: acc voidptr: acc wrapper_held_type: acc |rational| rational_test: acc |serialization| test_list_xml_warchive_dll: msvc-8.0 |statechart| BitMachineExample: acc PerformanceExample: acc TransitionTestBoth: acc TransitionTestNative: acc TransitionTestNormal: acc TransitionTestRelaxed: acc |tr1| std_test_regex: acc test_regex: acc tr1_is_abstract_test: acc |wave| testwave_dll: acc |xpressive| c_traits: acc misc2: acc multiple_defs: acc regress: acc test_dynamic: acc

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[variant] RTTI
by Michael Marcin 30 Jun '07

30 Jun '07

I need something similar to variant to optimize dynamic dispatches in my application much like what GIL uses. Unfortunately one of my target platforms does not support RTTI. How much does variant rely on the facilities of RTTI? Is it reasonable/possible to consider replacing RTTI to remove that dependency? I had to add a BOOST_NO_RTTI config macro locally several months ago in order to use lexical_cast. Perhaps RTTI could be used conditionally based on something similar. Thanks, Michael Marcin

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[config] Proposed new defect macro : BOOST_NO_IMPLICIT_BOOL_CONVERSION
by AlisdairM 30 Jun '07

30 Jun '07

Attached is the test file for a proposed new defect macro, BOOST_NO_IMPLICIT_BOOL_CONVERSION. This identifies compilers (such as Borland) that do not always convert expressions to bool as required by 5.14/5.15 and elsewhere. The workaround is fairly simple - detect the bad compiler and add an additional static_cast<bool>( ) around the (sub)expression. This only really catches classes relying on the convertible-to-unspecified-bool-type idiom. The test results I am posting have applied this workaround in a number of places, and obviously I would prefer to post those patches with a defect macro rather than compiler (and version) specific workarounds. Note: the tests checks all 'boolean contexts', not just the two or three that fail with Borland. I don't know if this will catch any other compilers. As ever, I am open to suggestions for a better name. -- AlisdairM

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[Getting started] Building with Mingwin/Cygwin without cygwin?
by John Maddock 30 Jun '07

30 Jun '07

In following up the attached message the cause appears to be a Boost.Build issue because specifying: bjam --toolset=gcc-nocygwin has no effect on the gcc command line, the generated command lines are simply: "g++" -ftemplate-depth-128 -O0 -fno-inline -Wall -g -mthreads -DBOOST_ALL_NO_LIB=1 -DBOOST_REGEX_DYN_LINK=1 -I"." -c -o "bin.v2\libs\regex\build\gcc-nocygwin\debug\threading-multi\cpp_regex_traits.o" "libs\regex\src\..\src\cpp_regex_traits.cpp" So there's no -mno-cygwin flag and the binaries are actually built for cygwin not mingw. At the same time there is no documented means of building with Mingw in the getting started guide: should there be? Cheers, John.

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[math_toolkit] ADL question
by Michael Marcin 30 Jun '07

30 Jun '07

Hello, I haven't looked much at the math toolkit yet but I was interested in how it handled errors so I peeked at common_error_handling.hpp I see it explicitly qualifies each all to isfinite with (boost::math::isfinite)( value ). I assume this is to prevent macro expansion however this means that if a UDT is passed in the user is required to add their isfinite to the boost::math namespace instead of having it be reachable through ADL. Is this intentional? I think the following would work if it's not. using boost::math::isfinite; isfinite BOOST_PREVENT_MACRO_SUBSTITUTION( value ); I'm not sure if UDT support for this library has been considered in its design but I'm working to provide a fixed-point math library that I hope can be used as a real type just like float and double. I would like to be able to keep as much as possible in the library's namespace. Thanks, Michael Marcin

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