July 2009 - Boost-users - lists.boost.org

Fw: xpressive app question
by Eric Niebler 05 Jul '09

05 Jul '09

(Resending from the correct email address.) ------Original Message------ From: Eric Niebler To: biolaser To: boost-users(a)lists.boost.org ReplyTo: eric.niebler(a)gmail.com Subject: Re: xpressive app question Sent: Jul 4, 2009 12:03 PM (Apologies for the top-post. Darn Blackberry.) Hi William, In the future, please send end user questions about Boost libraries to boost-users(a)lists.boost.org. Xpressive grammars with semantic actions have all the power to build any kind of parser you need, context-free or otherwise. I think it will work well for you. Another option to consider is Boost.Spirit, which is designed with the lex/yacc scenarios in mind. It is a very powerful parser generator, but without xpressive's dynamic grammar facilities. If you go that route, I'd recommend Spirit2, which is still under development but very usable, clean and powerful. Good luck, -- Eric Niebler BoostPro Computing www.boostpro.com From: "biolaser" Date: Fri, 3 Jul 2009 20:22:26 -0600 To: 'Eric Niebler'<eric.niebler(a)gmail.com> Subject: xpressive app question Hi Eric, I’ve been looking through the xpressive documentation and I’m very, very impressed. You’ve approached the creation of this system with astounding energy, a very wide pragmatic view of things, and great intelligence and foresight. I really hope xpressive will be suited for my needs. I’m desirous of creating a language (collection of grammars or tokens) that will be incorporated into a runtime for a report-writer engine I’m developing. The user will task the engine via this custom language. In the past I used lex and yacc extensively for similar projects. As you know, yacc facilitates the creation/recognition of a custom language (by defining patterns which contain various grammars (tokens)) and lex facilitates the creation/recognition of the individual grammars (tokens) themselves. Will xpressive facilitate the creation/recognition of a custom language by letting me define patterns of grammars? Or will I need to code that logic myself, as respects recognizing a collection of grammars to form certain complete language patterns? I hope I have posed my question clearly enough. If xpressive is not well suited to the higher level pattern-recognition tasks, is there something else that is yacc-like that will serve that purpose and that will work well with xpressive? Thanks for your help, William Stroupe

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[tuple] Function object for nth element of a tuple
by Jeremiah Willcock 05 Jul '09

05 Jul '09

Is there a standard way to get a function object that extracts a fixed element from a tuple? There is a boost::tuples::detail::get_class<N> that does what I want, but it does not have result_type and does not appear to be officially supported. -- Jeremiah Willcock

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A question on overloaded function? Can anyone with kindness help me?
by fmingu 05 Jul '09

05 Jul '09

I use Dev-C++,and the snipet of the program is: #pragma hdrstop # include <iostream> # include <vector> # include <iterator> # include "boost/math/common_factor.hpp" # include "boost/lambda/lambda.hpp" # include "boost/lambda/bind.hpp" # include "boost/lambda/if.hpp" # include "boost/lambda/casts.hpp" # include "boost/lambda/construct.hpp" # include "boost/lambda/loops.hpp" # include "boost/lambda/switch.hpp" # include "boost/tuple/tuple.hpp" # include "boost/tuple/tuple_comparison.hpp" # include <string> # include <map> using namespace std; using namespace boost::lambda; using namespace boost; void a(){ std::cout<<std::pow(4,3); return; } ............... but the complier told me that: main2test.cpp: In function `void a()': main2test.cpp:69: call of overloaded `pow(int, int)' is ambiguous F:/CB2009/Dev-Cpp/include/math.h:162: candidates are: double pow(double, double) F:/CB2009/Dev-Cpp/include/c++/cmath:401: float std::pow(float, float) F:/CB2009/Dev-Cpp/include/c++/cmath:410: long double std::pow(long double, long double) F:/CB2009/Dev-Cpp/include/c++/cmath:419: double std::pow(double, int) F:/CB2009/Dev-Cpp/include/c++/cmath:423: float std::pow(float, int) F:/CB2009/Dev-Cpp/include/c++/cmath:427: long double std::pow(long double, int) And in my computer, the C++ libraries includes are F:\CB2009\Dev-Cpp\include\c++ F:\CB2009\Dev-Cpp\include\c++\mingw32 F:\CB2009\Dev-Cpp\include\c++\backward F:\CB2009\Dev-Cpp\include F:\CB2009\boost_1_34_1\boost_1_34_1 I do not know how to solve it.I do not use <math> or <cmath> yet. Why the complier told me such files? And whether the two files are included in other files or not? And can I use: bind(&std::pow,constant(-1),bind(&IIPrimemap::size,var(primemapvec))); in the program? where : typedef std::pair<int, int> IIPrimepair; std::vector<IIPrimepair> primepairvec; Can anyone with kindness help me?

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[Boost.Test] C++ Unit Tests With Boost.Test, Part 3
by legalize+jeeves＠mail.xmission.com 05 Jul '09

05 Jul '09

[Please do not mail me a copy of your followup] <http://legalizeadulthood.wordpress.com/2009/07/05/c-unit-tests-with-boost-t…> In Part 2 of this series, I discussed the assertion facilities of Boost.Test and how to get the first passing test on Bob Martin's Prime Factors Kata. In this part, I will continue with test-driven development to complete the functionality of the PrimeFactors::Generate method. Please post comments on the blog. Thanks! -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

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[Boost.Test] C++ Unit Tests With Boost.Test, Part 2
by legalize+jeeves＠mail.xmission.com 05 Jul '09

05 Jul '09

[Please do not mail me a copy of your followup] <http://legalizeadulthood.wordpress.com/2009/07/05/c-unit-tests-with-boost-t…> In Part 1 of this series, I discussed how to setup a basic C++ unit test project that executed the unit tests when you built your code. In this part, I will discuss the assertion framework provided by Boost.Test in the context of a simple programming exercise that demonstrates test-driven development. Please post comments on the blog. Thanks. -- "The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download <http://www.xmission.com/~legalize/book/download/index.html> Legalize Adulthood! <http://legalizeadulthood.wordpress.com>

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A question on switch_statement. Can any one with kindness help me?
by fmingu 05 Jul '09

05 Jul '09

I am using Dev-C++ with boost lambda expression, and I wrote the following lines: ................ int result,switchvalue; .............. (switch_statement(_1, case_statement<1> (var(result)=0), case_statement<2> (var(result)=1), case_statement<3> (var(result)=constant(value)), default_statement (var(std::cout)<<"wrong") ))(switchvalue); but the complier told me that: instantiated from `Arg::sig<boost::tuples::tuple<A&, B&, C&, Env&, boost::tuples::null_type, boost::tuples::null_type,.......... instantiated from `RET boost::lambda::lambda_functor_base<boost::lambda::switch_action<5, boost::lambda::detail::case_label<Case0>, .................... instantiated from `T::sig<boost::tuples::tuple<A&, boost::tuples::null_type, boost::tuples::null_type, ......... instantiated from here And I do not know where is wrong and how to correct it. By the way, can I use make_const(switchvalue) or constant(switchvalue) instead of switchvalue? Can any one with kindness help me?

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[Boost.Test] Error: Non-aligned pointer being freed
by Sebastian Hauer 05 Jul '09

05 Jul '09

Hello Boost Users, when running my unit tests on Mac OS X compiled with darwin gcc 4.2.1 for x86_64 I am getting the following error messages printed out even though no testing error were detected. As a side note running the same unit test on Windows MSVC 8 or Solaris gcc 3.2 succeeds without issues, so this seems to be either gcc 4.2 or Mac OS X specific. --------------- hauer@gandalf:~/dev/shark4/utils$ bin/darwin-4.2.1/debug/address-model-64/architecture-x86/shark-utilstest_d Running 51 test cases... *** No errors detected shark-utilstest_d(45498) malloc: *** error for object 0x3000100301fb0: Non-aligned pointer being freed (2) *** set a breakpoint in malloc_error_break to debug shark-utilstest_d(45498) malloc: *** error for object 0x30001003020c0: Non-aligned pointer being freed (2) *** set a breakpoint in malloc_error_break to debug shark-utilstest_d(45498) malloc: *** error for object 0x3000100302200: non-page-aligned, non-allocated pointer being freed *** set a breakpoint in malloc_error_break to debug --------------- I then ran the test through gdb and set a breakpoint at malloc_error_break and took a backtrace as shown below: ---------------- Starting program: /Users/hauer/dev/shark/utils/bin/darwin-4.2.1/debug/address-model-64/architecture-x86/shark-utilstest_d warning: posix_spawn failed, trying execvp, error: 86 Reading symbols for shared libraries ++++++.. done Breakpoint 1 at 0x7fff83745a51 Running 51 test cases... *** No errors detected pirate-utilstest_d(45520) malloc: *** error for object 0x3000100300630: Non-aligned pointer being freed (2) *** set a breakpoint in malloc_error_break to debug Breakpoint 1, 0x00007fff83745a51 in malloc_error_break () (gdb) bt #0 0x00007fff83745a51 in malloc_error_break () #1 0x00007fff83740ad0 in szone_error () #2 0x00000001001655f8 in boost::unit_test::framework_impl::clear (this=0x1001c7600) at impl/framework.ipp:133 #3 0x0000000100165728 in boost::unit_test::framework_impl::~framework_impl (this=0x1001c7600) at impl/framework.ipp:122 #4 0x0000000100160d82 in __tcf_1 () at impl/framework.ipp:222 #5 0x00007fff8369d3dc in __cxa_finalize () #6 0x00007fff8369d2f2 in exit () #7 0x0000000100000ceb in start () ------------------ This point to framework_impl's clean() method: ------------------ void clear() { while( !m_test_units.empty() ) { test_unit_store::value_type const& tu = *m_test_units.begin(); // the delete will erase this element from map if( test_id_2_unit_type( tu.second->p_id ) == tut_suite ) delete (test_suite const*)tu.second; else delete (test_case const*)tu.second; // <-- Line 133 } } ----------------- I think test_case's dtor was made public in 1.39 but I guess this did not fix the problem at hand. Regards, Sebastian

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Re: [Boost-users] A question on overloaded function? Can anyone with kindness help me?
by fmingu 05 Jul '09

05 Jul '09

I do not understand the sentence: Ignore the "conversion to unsigned int" part. As you know, I am a new comer and quite puzzled about that. Does that mean to change the complier enviroment? Can you give me an example? Thank you for your kindness. 在2009-07-02，"Steven Watanabe" <watanabesj(a)gmail.com> 写道： >AMDG > >fmingu wrote: >> But how can I change the expression to be legal and usable? >> bind(&std::pow,constant(-1),bind(&IIPrimemap::size,var(primemapvec))); >> I tried : >> bind(&std::pow,constant(-1.0),bind<int>(&IIPrimemap::size,var(primemapvec))); >> and >> bind(&std::pow,constant(-1.0),ret<int>(bind(&IIPrimemap::size,var(primemapvec)))); >> even >> bind(&std::pow,constant(-1.0),ll_dynamic_cast<int>(bind(&IIPrimemap::size,var(primemapvec)))); >> But the complier told me that: >> cannot resolve overloaded function `pow' based on conversion to >> type `unsigned int' >> > >Ignore the "conversion to unsigned int" part. The compiler >doesn't know how to handle std::pow and gets itself confused. >The problem is &std::pow, not the inner bind expression. > >> I do not know how to solve now. >> Can anyone with kindness help me? >> >> >>> You can't pass the address of an overloaded function to >>> a function template like bind without casting it to the >>> correct function pointer type. >>> > >In Christ, >Steven Watanabe > 200万种商品,最低价格,疯狂诱惑你

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CRC: Set checksum value
by Chris Spencer 04 Jul '09

04 Jul '09

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Hi all, I am using the CRC library in my program and need some way to set the value of the checksum. I.e., crc_32_type crc; crc.set_value(somevalue); crc.checksum() == somevalue; Is this possible short of modifying the source? I can't see any way to do it from the documentation. Cheers, Chris. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iEYEARECAAYFAkpPuCsACgkQ6iqRtkAADZh4ZQCdGz9UWj9+9W/1SPw/jqPKCuyi /QAAniLRlVhIqhsAwAHYMFLlyOSuzdbY =ZLwZ -----END PGP SIGNATURE-----

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[test] gcc 4.2.1 unused warnings reappear in 1.39
by Sebastian Hauer 04 Jul '09

04 Jul '09

Hello Boost Users, I just upgraded from boost 1.38 to 1.39 on Mac OS X with darwin gcc 4.2.1 and noticed the following warnings: "g++" -ftemplate-depth-128 -O0 -fno-inline -Wall -g -dynamic -no-cpp-precomp -gdwarf-2 -arch x86_64 -fPIC -DBOOST_ALL_NO_LIB=1 -DBOOST_TEST_DYN_LINK -DSHARK_DEBUG -DSHARK_DYN_LINK -I"/Users/hauer/sys/boost_1_39-darwin-x86_64-xgcc42/include" -I"common/src" -I"utils/src" -c -o "utils/bin/darwin-4.2.1/debug/address-model-64/architecture-x86/test/shark/dtm/DateParserTest.o" "utils/test/shark/dtm/DateParserTest.cpp" /Users/hauer/sys/boost_1_39-darwin-x86_64-xgcc42/include/boost/test/floating_point_comparison.hpp:224: warning: ‘boost::test_tools::<unnamed>::check_is_close’ defined but not used /Users/hauer/sys/boost_1_39-darwin-x86_64-xgcc42/include/boost/test/floating_point_comparison.hpp:246: warning: ‘boost::test_tools::<unnamed>::check_is_small’ defined but not used Following the thread here: http://lists.boost.org/boost-users/2008/10/41326.php it seems that this was already something that got addressed a while ago and if I diff the header against 1.38 I notice this change for instance: namespace { -check_is_close_t const& check_is_close = unit_test::ut_detail::static_constant<check_is_close_t>::value; +check_is_close_t check_is_close; } Is there a reason why the static_constant template was removed and you reverted back to the original version? Regards, Sebastian PS: Below the original message from Gennadiy were he mentioned he applied the static_constant patch. On Fri, Nov 21, 2008 at 6:42 PM, Gennadiy Rozental<rogeeff(a)gmail.com> wrote: > Juergen Hunold <juergen.hunold <at> ivembh.de> writes: > >> On Wednesday 05 November 2008 19:20:37 Mat Marcus wrote: >> > On Mon, Oct 13, 2008 at 12:42 PM, Steven Watanabe <watanabesj <at> >> > gmail.com> >> > This trick seemed to work at first, but then when I ran the 1.37.0 >> > test tests I got: >> > >> > ..\..\libs\test\example\unit_test_example_10.cpp(75) : error C2039: >> > 'check_is_close' : is not a member of 'boost::test_tools' >> > ..\..\libs\test\example\unit_test_example_10.cpp(75) : error C2065: >> > 'check_is_close' : undeclared identifier >> >> Did you try my patch as described in #2390 ? > > I've checked in patch along the line of what you proposed. Let's see if > anything > breaks. > > Gennadiy > > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

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