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RE: [Boost-Users] question about any class ...
by scleary＠jerviswebb.com 10 Nov '01

10 Nov '01

> any is really a powerful class, but sometimes I would also be > able to know directly the type stored into it without 'guessing', for > example to use it in template code. > What I would like to have is something as > > type_info::real_type for the value hidden into any (not legal > C++, maybe > legal C++0x ?), This actually wouldn't help you, still. How would the declaration look? typeof() wouldn't work, either... > or, alternatively, virtual template functions (again not > legal C++) to be > able to write generic > code depending on both hidden value's type and types 'from the outside > world' (sorry cannot explain it better :-( than this) I have run into this same problem. To re-phrase it, Gianni is trying to do an "operation" on a contained value. 'any' supports the "operations" of copying and destruction as-is; manual modification of 'any' could support other "operations" (this is what Gianni means when he talks about "visiting" the any class, below): any { ... void f() { if (content) content->f(); } }; any::placeholder { ... virtual void f() = 0; }; any::holder<...> ... { ... virtual void f() { held.f(); } }; The problem is how to do this generically (i.e., provide a solution for any "operation"). Another way of looking at this is to force 'any' to call a function that is overloaded on the type of the contained value. Strictly speaking, this isn't possible because 'any' makes the compile-time info into run-time info. > I have tried various approaches, but if I 'visit' the any > class adding a > virtual function to reach hidden value I loose generic type > information > (lack of virtual template functions) from the outside while from the > outside of any > I cannot obtain directly the type of the hidden value ... > > is there a way to do the above ? I have not been successful. Again, 'any' changes compile-time information into run-time information, and to go the other way is just not possible in this language. You could take a "nasty-hack" approach, if you *really* wanted to: 1) Add an 'any_base' class with a virtual function 2) Extend 'any' to return an 'any_base *' referring to the held value, using C-cast notation (derived-to-base when possible, reinterpret when not) 3) Derive your held value types from a common base class 'my_base', which was derived from 'any_base'; add the operations you want to perform to 'my_base' 4) Call the 'any' function returning 'any_base *', downcasting it to 'my_base'. This will result in undefined behaviour if the contained value is not actually derived from 'my_base' (because of the reinterpret_cast behaviour in step 2) I *think* that will work (never tried it). Messy, though, and IMO not generic enough to mess with. Alternatively, you could: 1) Visit 'any'/'any::placeholder'/'any::holder' to provide: void any::action(any which) { content->action(which); } virtual void any::holder::action(any which) { any_action(held, which); } 2) Declare a function 'any_action(T, any)', where the any parameter designates which "operation" to perform. Overloading is then possible on T. Also, where T is a user-defined type, Koenig lookup can be used (abused?) to create different (non-overlapping) sets of "operations". Just some thoughts. Again, I've never tried it. -Steve

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question about any class ...
by Gianni Luciani 10 Nov '01

10 Nov '01

Hi, any is really a powerful class, but sometimes I would also be able to know directly the type stored into it without 'guessing', for example to use it in template code. What I would like to have is something as type_info::real_type for the value hidden into any (not legal C++, maybe legal C++0x ?), or, alternatively, virtual template functions (again not legal C++) to be able to write generic code depending on both hidden value's type and types 'from the outside world' (sorry cannot explain it better :-( than this) I have tried various approaches, but if I 'visit' the any class adding a virtual function to reach hidden value I loose generic type information (lack of virtual template functions) from the outside while from the outside of any I cannot obtain directly the type of the hidden value ... is there a way to do the above ? Gianni Luciani

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Re: any question
by Kevlin Henney 09 Nov '01

09 Nov '01

> From: Thomas Matelich <toms-mailing-lists(a)home.com> > >In the docs, it uses a function called any_ptr, but I don't think it >exists. Could someone please explain? Yes, nothing more elaborate than a typo, I'm afraid! Should be any_cast. Kevlin ____________________________________________________________ Kevlin Henney phone: +44 117 942 2990 mailto:kevlin@curbralan.com mobile: +44 7801 073 508 http://www.curbralan.com fax: +44 870 052 2289 Curbralan: Consultancy + Training + Development + Review ____________________________________________________________

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casting shared_ptr while preserving use_count..
by John Liberty 09 Nov '01

09 Nov '01

I'd like to essentially downcast (to derived) from a base class with virtual methods while preserving (and incrementing) the use_count.. for an upcast, I can simply assign a shared_ptr<Child> to shared_ptr<Parent>. But for the downcast, I need to incorporate a dynamic_cast<childType> to get what I want.. With an older compiler that didn't like member templates, the boost conf would leave the internal pointer and use count as public, so I wrote my own casting function.. However, the newer compiler doesn't give this public access, so I may be stuck without modifying the header... any thoughts?

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How to build the latest release?
by Sinan 08 Nov '01

08 Nov '01

No matter what I try, ( I set JAMBASE, specified boost-base.jam etc... I always get the following error kanita% jam -f./tools/build/allyourbase.jam -sTOOLS="suncc" ./tools/build/allyourbase.jam: line 1608: syntax error at keyword ( don't know how to make all ...found 1 target... ...can't find 1 target... kanita% Line 1608 is the one that says: rule remember-binding ( target : bound-path ) { gBINDING($(target)) = $(bound-path) ; } ... How do I make jam understand the extended syntax ? ( Using FTjam 2.3.5 ...) Sinan Karasu ---------- # (C) Copyright David Abrahams 2001. Permission to copy, use, # modify, sell and distribute this software is granted provided this # copyright notice appears in all copies. This software is provided # "as is" without express or implied warranty, and with no claim as # to its suitability for any purpose. # compute directories for invoking WS6U2 WS6U2_BIN_DIRECTORY ?= $(WS6U2_ROOT_DIRECTORY)$(SLASH)bin ; WS6U2_BIN_DIRECTORY ?= "" ; # Don't clobber tool names if WS6U2_ROOT_DIRECTORY not set WS6U2_INCLUDE_DIRECTORY ?= $(WS6U2_ROOT_DIRECTORY)$(SLASH)include ; WS6U2_STDLIB_DIRECTORY ?= $(WS6U2_ROOT_DIRECTORY)$(SLASH)lib ; flags cc LINKFLAGS <runtime-link>static : -Bstatic ; flags cc CFLAGS <debug-symbols>on : -g ; flags cc LINKFLAGS <debug-symbols>on : -g ; flags cc CFLAGS <optimization>off : -xO0 ; flags cc CFLAGS <optimization>speed : -xO4 ; # Other optimizations we might want for WS6U2 # # flags cc CFLAGS <optimization>space : -xO2 ; flags cc CFLAGS <inlining>off : -xinline=no%func ; flags cc CFLAGS <inlining>on : -xinline=%auto ; flags cc CFLAGS <inlining>full : -xinline=%auto ; flags cc CFLAGS <profiling>on : -xpg ; flags cc LINKFLAGS <profiling>on : -xpg ; flags cc DEFINES <define> ; flags cc UNDEFS <undef> ; flags cc HDRS <include> ; flags cc STDHDRS : $(WS6U2_INCLUDE_DIRECTORY) ; flags cc STDLIBPATH : $(WS6U2_STDLIB_DIRECTORY) ; flags cc CFLAGS <shared-linkable>true : -KPIC ; flags cc LINKFLAGS <shared-linkable>true : -KPIC ; flags cc LINKFLAGS <target-type>DLL : -G ; flags cc LIBPATH <library-path> ; flags cc NEEDLIBS <library-file> ; flags cc FINDLIBS <find-library> ; #### Link #### rule Link-action { # This will appear before the import library name when building a DLL, but # will be "multiplied away" otherwise. The --exclude-symbols directive # proved to be neccessary with some versions of Cygwin. ##sik IMPLIB_COMMAND on $(<) = "-Wl,--exclude-symbols,_bss_end__:_bss_start__:_data_end__:_data_start__ -Wl,--out-implib," ; # IMPLIB_COMMAND on $(<) = "-Wl,--out-implib," ; cc-Link-action $(<) : $(>) ; } # for cc, we repeat all libraries so that dependencies are always resolved actions cc-Link-action bind NEEDLIBS { $(WS6U2_BIN_DIRECTORY)CC $(IMPLIB_COMMAND)$(<[2]) $(LINKFLAGS) -o "$(<[1])" -L$(LIBPATH) -L$(STDLIBPATH) "$(>)" "$(NEEDLIBS)" "$(NEEDLIBS)" -l$(FINDLIBS) -znodefs } # older actions # $(WS6U2_BIN_DIRECTORY)dlltool -e $(<[1]:S=:D=:G=) -l "$(<[2])" "$(>)" # $(WS6U2_BIN_DIRECTORY)CC $(LINKFLAGS) -L$(STDLIBPATH) "$(>)" "$(NEEDLIBS)" "$(NEEDLIBS)" -o "$(<[1])" #### Cc ##### rule Cc-action { cc-Cc-action $(<) : $(>) ; } actions cc-Cc-action { $(WS6U2_BIN_DIRECTORY)cc -c -U$(UNDEFS) -D$(DEFINES) $(CFLAGS) -I$(BOOST_ROOT) -I"$(HDRS)" -I"$(STDHDRS)" -o "$(<)" "$(>)" } #### C++ #### rule C++-action { cc-C++-action $(<) : $(>) ; } actions cc-C++-action { $(WS6U2_BIN_DIRECTORY)CC -c -U$(UNDEFS) -D$(DEFINES) $(CFLAGS) $(C++FLAGS) -I$(BOOST_ROOT) -I"$(HDRS)" -I"$(STDHDRS)" -o "$(<)" "$(>)" } #### Archive #### rule Archive-action { cc-Archive-action $(<) : $(>) ; } actions updated together piecemeal cc-Archive-action { ar ru "$(<)" "$(>)" } [Non-text portions of this message have been removed]

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any question
by Thomas Matelich 08 Nov '01

08 Nov '01

In the docs, it uses a function called any_ptr, but I don't think it exists. Could someone please explain? -- Thomas O Matelich Senior Software Designer Zetec, Inc. matelich(a)home.com tmatelich(a)zetec.com

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Boost release 1.25.1 now available
by Beman Dawes 07 Nov '01

07 Nov '01

Boost release 1.25.1 is now available at www.boost.org: * Boost Build System: Continued improvements. * Config Library: Continued refinements. * Graph Library: Final cleanup for upcoming the Boost Graph Library book. * Thread Library: Minor fixes - tests now pass on most Win32 and POSIX systems including Linux and Solaris. Semaphore removed as too error prone. * Function Library: direct support for member function pointers and documentation updates. * Boost-Users mailing list has been created to address topics of interest to users of Boost libraries. * Boost Wiki web added. Provides a place for Boost users to openly discuss and document the use of Boost libraries. It is not officially maintained by Boost developers. This release uses a new ftp program for updating the web site; the program used in the past was prone to get confused about dates, and didn't recover gracefully from network or server errors. Please let me know if you spot any out-of-date web pages on the site. --Beman

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Boost-Users announcement in 1.25.1
by Douglas Gregor 02 Nov '01

02 Nov '01

Hello all, We should announce the existence of the Boost-Users group in the 1.25.1 release of Boost. I've added a bullet to the "Latest News" entry for the release (just check index.htm in the top level of CVS). My two questions are: - Is there a more precise goal statement that should be in the announcement? (i.e., more precise that "address topics of interest to users of Boost libraries", which is intentionally vague) - Should we mention the Wiki? (with the usual not-Boost-moderated disclaimer) Doug

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RE: [Boost-Users] array -v- array_traits
by Jim.Hyslop 25 Oct '01

25 Oct '01

Duane Murphy [SMTP:duanemurphy@mac.com] wrote: > I noticed that array.hpp uses > > #ifndef BOOST_ARRAY_HPP > #define BOOST_ARRAY_HPP > .. > #endif > > and array_traits.hpp uses: > > #if !defined(BOOST_ARRAY_HPP) > #define BOOST_ARRAY_HPP 1 > .. > #endif > > This means that you cant use them both at the same time? The first one wins? > > These are certainly similar classes but they dont seem to collide. > > Is this a subtle bug or intentional? Hi, Duane. I don't know the answer, but I've cc'd this to the Boost developer's list. Someone there should have an answer ;-) -- Jim Hyslop (moderator, Boost-Users group)

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array -v- array_traits
by Duane Murphy 25 Oct '01

25 Oct '01

I noticed that array.hpp uses #ifndef BOOST_ARRAY_HPP #define BOOST_ARRAY_HPP .. #endif and array_traits.hpp uses: #if !defined(BOOST_ARRAY_HPP) #define BOOST_ARRAY_HPP 1 .. #endif This means that you cant use them both at the same time? The first one wins? These are certainly similar classes but they dont seem to collide. Is this a subtle bug or intentional? ..Duane

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FW: [boost] any
by Jim.Hyslop 19 Oct '01

19 Oct '01

rajanikanth jammalamadaka [SMTP:rajanik3@rediffmail.com] wrote: > Hi! Jim, > Could you please tell me why this code is not working: > > #include <iostream> > #include <boost/any.hpp> > using namespace boost; > int main() > { > > any holdsanything ; > holdsanything = 9; > std::cout<<holdsanything<<endl; > holdsanything = std::string("hello"); > std::cout<<holdsanything<<endl; > return 0; > } Hi, Raj You didn't specify what problems you were having. Am I correct in assuming you get a compiler error on the std::cout lines? If so, then the problem is that class 'any' does not have an extraction operator defined. If you change the lines to: std::cout << any_cast<int>(holdsanything)<<std::endl; and std::cout << any_cast<const char *>(holdsanything) << std::endl; it should work properly. -- Jim

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compiling boost on Win2k
by Mike Owens 19 Oct '01

19 Oct '01

I got a this suggestion from Damien Mulligan which worked really well. Use subst to map a drive letter to the path for the MSVC directory then use that drive letter in the VISUALC environment variable. Works like a charm. I should of thought of that. Thanks Damien. Mike > Date: Thu, 18 Oct 2001 08:12:05 -0400 > From: Anthony Kolarik <a.kolarik(a)computer.org> >Subject: RE: Digest Number 11 > >I don't have an answer for your specific JAM/Boost problem but I've seen >similar build problems (using cons)on NT and ended up using temp files to >hold the command line for the linker, rather than try to figure out why the >command lines worked fine on some machines and were too much for others. >You could look into registry settings to extend the buffer size for the >command interpreter but unless you can do it programmatically the temp file >approach would probably be a better. > -- Tony K.

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RE: [Boost-Users] Digest Number 11
by Anthony Kolarik 18 Oct '01

18 Oct '01

I don't have an answer for your specific JAM/Boost problem but I've seen similar build problems (using cons)on NT and ended up using temp files to hold the command line for the linker, rather than try to figure out why the command lines worked fine on some machines and were too much for others. You could look into registry settings to extend the buffer size for the command interpreter but unless you can do it programmatically the temp file approach would probably be a better. -- Tony K. > Date: Wed, 17 Oct 2001 15:47:58 -0700 > From: Mike Owens <mikeo(a)medifor.com> > Subject: Build Problem > > I am trying to build boost on windows 2000 and I get "The > input line is too > long" errors. I have included some sample output from jam. > Please note I > switched to short file names to try and alleviate this > problem. Anyone have > any suggestions on overcoming this problem? > > "C:\Progra~1\micros~2\VC98"\bin\cl /Zm400 -nologo -GX -c > -DNDEBUG > -DBOOST_ > RE_NO_LIB=1 /O2 /GX /GR /MD -I"libs\regex\build" > -I"libs\regex\build\..\..\.. > " -I""C:\Progra~1\micros~2\VC98"\include" > -Fo"libs\regex\build\bin\libboost_re > gex.lib\msvc\release\runtime-link-dynamic\posix_api.obj" > -Tp"libs\regex\build\. > ./src\posix_api.cpp" > > ...failed msvc-C++-action > libs\regex\build\bin\libboost_regex.lib\msvc\release\r > untime-link-dynamic\posix_api.obj ... > msvc-C++-action > libs\regex\build\bin\libboost_regex.lib\msvc\release\runtime-lin > k-dynamic\regex.obj > The input line is too long. >

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Build Problem
by Mike Owens 17 Oct '01

17 Oct '01

I am trying to build boost on windows 2000 and I get "The input line is too long" errors. I have included some sample output from jam. Please note I switched to short file names to try and alleviate this problem. Anyone have any suggestions on overcoming this problem? "C:\Progra~1\micros~2\VC98"\bin\cl /Zm400 -nologo -GX -c -DNDEBUG -DBOOST_ RE_NO_LIB=1 /O2 /GX /GR /MD -I"libs\regex\build" -I"libs\regex\build\..\..\.. " -I""C:\Progra~1\micros~2\VC98"\include" -Fo"libs\regex\build\bin\libboost_re gex.lib\msvc\release\runtime-link-dynamic\posix_api.obj" -Tp"libs\regex\build\. ./src\posix_api.cpp" ...failed msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc\release\r untime-link-dynamic\posix_api.obj ... msvc-C++-action libs\regex\build\bin\libboost_regex.lib\msvc\release\runtime-lin k-dynamic\regex.obj The input line is too long.

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How about a link to the burgeoning Wiki?
by Jon Kalb 16 Oct '01

16 Oct '01

I've added a Wiki link to the Group Bookmarks and also a link to the FAQ on the Wiki. We need to build that up. :) I also added a link to the Group Bookmarks page on the Group home page. ===== Jon Kalb Kalb(a)LibertySoft.com __________________________________________________ Do You Yahoo!? Listen to your Yahoo! Mail messages from any phone. http://phone.yahoo.com

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precompiled jam executables uploaded
by Toon Knapen 13 Oct '01

13 Oct '01

I just uploaded precompiled jam executables to the Files section for linuxx86, irix and solaris. I also added an InstallingBoost page to the Wiki with links to these executables. I hope this helps people with using the Boost.Build system. I gzip'ed the executables (except for the linux one) since I'm not sure if users find it a hassle to gunzip them first. It would safe space in the Files section though. People with jam executables for other platforms, please add them or transfer them to me so I can put them on there. toon

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Building with Comeau
by Dale Peakall 12 Oct '01

12 Oct '01

Anyone had any success using the new build system with Comeau C++ on Win32 (MSVC6)? I'm using the pre-compiled Win32 jam binary from the FreeType project. Is this still suitable? I noticed Dave has checked in a whole bunch of changes to SourceForge. If not, is there an easy way to get the whole branch out of CVS? I've only ever used the web-interface which doesn't seem to provide this facility. The first problem I encountered was jam trying to use mv. After replacing the $(MV) instructions in the como-tools.jam with copy, I managed to get some obj files produced, but none of the libraries will link. First up, I noticed that the build system requires libcomo to be in a certain location, so I fixed that, but still nothing will link (lots of undefined external symbols - some to boost, some to std). I'm a Comeau newbie, so I may have messed up building libcomo (which would explain the missing std symbols), but not the missing boost symbols. Cheers, - Dale.

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boost/thread on Linux
by sebmarc＠yahoo.com 09 Oct '01

09 Oct '01

Has anyone successfully built boost/thread on Linux using g++ ?. I am getting two compilation errors. Seb.

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Thread Summary Experiment -- on the Wiki
by Jeff Garland 08 Oct '01

08 Oct '01

Last week we were having a discussion about the sort of content that might, or might not belong on the Wiki. I have tried another small experiment that might be a useful approach to augmenting the current boost information. The idea is to build a summary of mailing list discussion threads related to each library (or other topics). Many of the discussion on the mailing list can provide insight into the library design as well as solutions to specific problems not necessarily incorporated in the documentation. I built a small example for the function library. http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl?Function_Lib… -_Mail_Thread_Summary I have used the following convention for this: -- Order the thread names by date -- Title of the thread is either the email title, or a more precise title followed by the original thread title in parens The link performs a search that returns all the items in the thread from the yahoo groups site. One problem is that since the search is full text, some threads cannot be easily retrieved. For example searching "function review" will return a pile of email on threads and other topics unrelated to function. Despite the issues, this would seem to me this would be a useful contribution library users could build. Thoughts? Jeff

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concept_check and B&N trick
by Eric Ford 03 Oct '01

03 Oct '01

I ran into problems using BOOST_CLASS_REQUIRES in conjunction with the base class in the Barton-Nackman trick/Curiously recursive template technique. I want to require functions that take the derived type as an argument. So I declare a variable of the derived at struct level in the concept class, but then g++ (2.95) complains about it being an invalid use of undefined type... forward declaration... . Is there a way to make this work? If so, does anyone have/know of an example I can see how to order things to make it work? Thanks, E

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Building regex/1.25.0 with MSVC6SP5, STLPort 4.0
by Markus Schöpflin 02 Oct '01

02 Oct '01

Hi there, I've been trying to build the regex library but failed miserably. The compiler always dies with an error in "regex_traits.hpp" C:\boost_1_25_0\libs\regex\build>nmake INCLUDES="-I%STL_INCLUDE%" -fvc6-stlport.mak Microsoft (R) Program Maintenance Utility Version 6.00.8168.0 Copyright (C) Microsoft Corp 1988-1998. All rights reserved. if not exist "vc6-stlport\" mkdir vc6-stlport if not exist "vc6-stlport\vc6-stlport-re300m\" mkdir vc6-stlport\vc6-stlport-re300m cl -IC:\STL\STLport-4.0\stlport /nologo /MT /W3 /GX /O2 /GB /GF /Gy /I..\..\..\ /D_MT /DWIN32 /DNDEBUG /D_MBCS /D_LIB / YX /FD /c -Fpvc6-stlport/vc6-stlport-re300m/vc6-stlport-re300m.pch -Fo./vc6-stlport/vc6-stlport-re300m/ -Fdvc6-stlport/vc6-stlport-re300m.pdb ../src/c_reg ex_traits.cpp c_regex_traits.cpp ..\..\..\boost/regex/regex_traits.hpp(596) : error C2059: syntax error : '<' ..\..\..\boost/regex/regex_traits.hpp(596) : error C2238: unexpected token(s) preceding ';' ..\..\..\boost/regex/regex_traits.hpp(597) : error C2059: syntax error : '<' ..\..\..\boost/regex/regex_traits.hpp(597) : error C2238: unexpected token(s) preceding ';' ..\..\..\boost/regex/regex_traits.hpp(688) : error C2059: syntax error : '<' ..\..\..\boost/regex/regex_traits.hpp(688) : error C2238: unexpected token(s) preceding ';' ..\..\..\boost/regex/regex_traits.hpp(689) : error C2059: syntax error : '<' ..\..\..\boost/regex/regex_traits.hpp(689) : error C2238: unexpected token(s) preceding ';' ..\..\..\boost/regex/regex_traits.hpp(690) : error C2059: syntax error : '<' ..\..\..\boost/regex/regex_traits.hpp(690) : error C2238: unexpected token(s) preceding ';' NMAKE : fatal error U1077: 'cl' : return code '0x2' Stop. The error stays the same if I try the new build system with the following command line: jam -ftools/build/allyourbase.jam -sTOOLS="msvc" -sBUILD="<include>%STL_INCLUDE%" If I look at the offending line in "regex_traits.hpp" it reads const std::ctype<char>* pctype; Obviously it doesn't know that ctype lives in the std namespace. It works if I use the STL supplied by Microsoft. Does anyone else use this combination of compiler and library and managed to successfully build the regex library? Markus 'mar

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RE: [Boost-Users] Building regex/1.25.0 with MSVC6SP5, STLPort 4. 0
by Jim.Hyslop 02 Oct '01

02 Oct '01

Markus Schöpflin [SMTP:markus.schoepflin@ginit-technology.com] wrote: > I've been trying to build the regex library but failed miserably. The > compiler always dies with an error in "regex_traits.hpp" [...] > It works if I use the STL supplied by Microsoft. I don't use STLPort, but you might try a slight modification to boost/config/suffix.hpp. Search for BOOST_NO_STDC_NAMESPACE, and you'll see the line: namespace std { using ::ptrdiff_t; using ::size_t; } Try adding "using ::ctype;" into the list of using declarations. This may not work, though; I don't know if a using declaration can nominate the name of a template. -- Jim

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How about a link to the burgeoning Wiki?
by Tom Matelich 01 Oct '01

01 Oct '01

http://www.crystalclearsoftware.com/cgi-bin/boost_wiki/wiki.pl

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RE: [Boost-Users] How about a link to the burgeoning Wiki?
by Jim.Hyslop 01 Oct '01

01 Oct '01

Paul Baxter [SMTP:paul_baxter@ntlworld.com] wrote: > Organised snippets from the mailing list (ala cpptips with the guru/C++ > newsgroups) and additional real user FAQs would seem the most useful content > to add to Wiki? That's the beauty of a Wiki: do you see something missing? *You* can add it! -- Jim

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Test #3
by david.abrahams＠rcn.com 28 Sep '01

28 Sep '01

Ce n'est pas une pipe [Moderators note] Pas du tout...

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