- Boost-users - lists.preview.boost.org

[mpl] integer for_each
by Yuval Ronen 28 Mar '06

28 Mar '06

Hi. I have a function which is templated with an integer template <int N> void f() { ... } Within this function, I wish to use mpl::for_each to call another integer-templated (say, g()) function, with all numbers from 0 to N-1. How can I achieve this? I thought of making a mpl::vector<int_<0>, int_<1>, ..., int_<N-1> >, and then use mpl::for_each to iterate it, but I don't know how to generate this mpl::vector. How can I do that? Or maybe there's a better way? BTW: I first thought of using mpl::vector_c, but it seems that mpl:for_each doesn't support mpl::vector_c, only mpl::vector. Is this true? Thanks, Yuval

2 2

ERROR (?) in interplay between uBLAS and STL algorithms.
by Pascal Bauer 28 Mar '06

28 Mar '06

Hi List, I created a (stl vector) of matrix_rows from the boost uBLAS. This seems to work fine. But somehow, the interplay with the stl algorithms seems then not to work. If I compile the code, i would expect a list of all the rows, ordered by the first row entry. But to sort algorithms seems to create multiple copies of the same matrix row. Can someone tell me, what is going wrong there? I'm using the gcc version 4.0.2 20050901 (prerelease) (SUSE Linux). Many thanks for advises how to make this work. Here the Code: #include <boost/numeric/ublas/matrix.hpp> #include <boost/numeric/ublas/matrix_proxy.hpp> #include <boost/numeric/ublas/io.hpp> #include <vector> #include <algorithm> namespace num = boost::numeric::ublas; typedef num::matrix<double> matrix_type; typedef num::matrix_row<matrix_type> matrix_row; typedef std::vector<matrix_row> data_proxy; template <int N> class Ordering { public: bool operator()(const matrix_row& row_1, const matrix_row& row_2) { return row_1(N) < row_2(N); } }; int main(int argc, char* argv) { const size_t N_1 = 25; const size_t M_1 = 10; const size_t N_2 = 20; const size_t M_2 = 10; matrix_type Data_1(N_1, M_1); matrix_type Data_2(N_2, M_2); data_proxy my_proxy; for (size_t i = 0; i < N_1; ++i) { Data_1(i, 0) = i; my_proxy.push_back(matrix_row(Data_1, i) ); } for (size_t j = 0; j < N_2; ++j) { Data_2(j, 0) = 0.5 + j; my_proxy.push_back(matrix_row(Data_2, j) ); } data_proxy copy(my_proxy); std::sort(my_proxy.begin(), my_proxy.end(), Ordering<0>() ); for (size_t i = 0; i < my_proxy.size(); ++i) { std::cout << my_proxy[i] << std::endl; } }

1 0

RegEx Exception
by Michael Primeaux 28 Mar '06

28 Mar '06

I'm using the latest version of the boost regex libraries and am receiving an exception when using the regex_replace function with the following regular expression: (?i)(?<!')((<\s*OBJECT\s*[^>]+classid="clsid:[^>]+?(?<!\s*/\s*)>[^*]+?<\s*/\ s*OBJECT\s*>)|(<\s*OBJECT\s*[^>]+classid=\s*\"clsid:[^/>]+/)) ..which works in other industry standard regex library routines. I seem to be failing on line 767 of basic_regex_creator.hpp. Any assistance is appreciated. Kindest regards, Michael Primeaux

3 3

Re: [Boost-users] safe assign of int to enum
by Sohail Somani 28 Mar '06

28 Mar '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of Tim > Robertson > Sent: Monday, March 27, 2006 3:46 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] safe assign of int to enum > > I've wasted many hours doing most of these things, so I would be > interested in seeing your solution. > > At the very least, could you post some information on the > approach you > used to keep the forward/reverse mappings updated > automatically? Also, > were you able to do all of this without balooning the size of your > "enums"? I've never found a way to do that.... You make a good point. We should want sizeof(other_enum)==sizeof(c_enum). Not everyone needs to map between strings and enumerations

3 2

Boost.Filesystem is there a way to lock files/directories and set their permissions?
by Elisha Berns 28 Mar '06

28 Mar '06

Hi, Is there a way to use Boost.Filesystem to lock file and directories and also set file and directory permissions? From the documentation there appears to be none, so can this feature be added to the next version? Elisha Berns e.berns(a)computer.org tel. (310) 556 - 8332 fax (310) 556 - 2839

2 1

Re: [Boost-users] safe assign of int to enum
by Sohail Somani 27 Mar '06

27 Mar '06

By defn, static_cast does not provide runtime checks. You should use an enum class or something. Boost needs scoped enums! Anyway, I've used this with varying degrees of success but its not really easy to specialize: #include <cassert> struct MyEnum { enum type { a,b,c, min=a, max=c }; }; template<typename Enum> typename Enum::type convert_enum(int a) { typedef typename Enum::type type_; assert(a >= Enum::min && a <= Enum::max); return type_(a); } int main() { MyEnum::type b(convert_enum<MyEnum>(0)); // ok MyEnum::type a(convert_enum<MyEnum>(5)); // dies } > -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Oliver.Kowalke(a)infineon.com > Sent: Sunday, March 26, 2006 10:42 PM > To: boost-users(a)lists.boost.org > Subject: [Boost-users] safe assign of int to enum > > Hello, > is a technique available in boost in order to assign an int value to a > enum? > > enum E > { > e1 = 1, > e2 = 2, > e3 = 3 > }; > > E e( static_cast< E >( 1) ); // should work > > E e( static_cast< E >( 5) ); // should throw exception at runtime > > Regards, > Oliver > _______________________________________________ > Boost-users mailing list > Boost-users(a)lists.boost.org > http://lists.boost.org/mailman/listinfo.cgi/boost-users >

3 3

Re: [Boost-users] safe assign of int to enum
by Sohail Somani 27 Mar '06

27 Mar '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org > [mailto:boost-users-bounces@lists.boost.org] On Behalf Of > Tomas Puverle > Sent: Monday, March 27, 2006 12:07 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] safe assign of int to enum > > > template<typename Enum> > > typename Enum::type convert_enum(int a) > > { > > typedef typename Enum::type type_; > > assert(a >= Enum::min && a <= Enum::max); > > return type_(a); > > } > > This won't work for enums where the range is not continuous. > > I wrote a library for "smart enums" that allow you to: I am aware of these limitations :) I vote for post!

1 0

Re: [Boost-users] safe assign of int to enum
by Nat Goodspeed 27 Mar '06

27 Mar '06

> -----Original Message----- > From: boost-users-bounces(a)lists.boost.org [mailto:boost-users- > bounces(a)lists.boost.org] On Behalf Of Tomas Puverle > Sent: Monday, March 27, 2006 3:07 PM > To: boost-users(a)lists.boost.org > Subject: Re: [Boost-users] safe assign of int to enum > > I wrote a library for "smart enums" that allow you to: > > 1) Keep a forward and reverse mappings between enums and strings (in > fact, > you can use multiple strings for a single enum value ;) This is done in > such a > way that you can't fail to update the string table if you add/change an > enum > and vice versa. [Nat] I have long wished the compiler would support mapping enums to/from string. If you have a maintainable way to do that, I'm very interested.

1 0

Re: [Boost-users] Serialization library question
by wayne.x.liu＠jpmchase.com 27 Mar '06

27 Mar '06

I removed the extra BOOST_CLASS_EXPORT_GUID(bus_stop, "bus_stop"), and unfortunately, it core dumped in the same place. Wayne Liu ---- original message ---- Date: Mon, 27 Mar 2006 08:15:35 -0800 From: "Robert Ramey" <ramey(a)rrsd.com> Subject: Re: [Boost-users] Serialization library question To: boost-users(a)lists.boost.org Message-ID: <e09334$60o$1(a)sea.gmane.org> This looks like it should work. I'll look at it more carefully later. Note that the BOOST_CLASS_EXPORT_GUID(bus_stop, "bus_stop") should be superfluous since an instance of an abstract class cannot be created. Try removing this and see if it works. Let me know what happens. If that fixes it - I would like to know. Robert Ramey

1 0

Newbie question regarding complation with Visual Studia .NET
by Vijay Choudhary 27 Mar '06

27 Mar '06

Hi, I am using STLport-4.5.3 and I am also using Microsoft Visual C++ .NET (Microsoft Development Environment 2003 Version 7.1.3088)as IDE for my project. I am trying to use regex in my application but I have some doubts and I am not able to link my application with boost_1_33_1. * Where should STLPORT_PATH should point to. I have set it to "C:\STLport" where STLport contains directories such as "STLport-4.5.3" etc. Is that correct? * Then I switched to directory c:\boost\boost_1_33_1\libs\regex\build * Then I run "C:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\bin\vcvars32.bat" * Then I run the following command nmake -f vc71-stlport.mak. It works OK. * When I run the following command "nmake -fvc71-stlport.mak install" I got an error as follows: Building Boost.Regex without ICU / Unicode support Hint:set ICU_PATH on the name command line to point to your ICU installation if you have one. NMAKE : fatal error U1073: Don't know how to make '"C:\STLport\stlport\string"' Stop. Any help will be highly appreciated! Regards: Vijay Kumar CONFIDENTIALITY NOTICE This e-mail transmission and any documents, files, or previous e-mail messages appended or attached to it, may contain information that is confidential or legally privileged. If you are not the intended recipient, or a person responsible for delivering it to the intended recipient, you are hereby notified that any disclosure, copying, printing, distribution, or use of the information contained or attached to this transmission is STRICTLY PROHIBITED. If you have received this transmission in error, please immediately notify the sender by telephone (091.0172.2299512) or return e-mail message (vkchoudhary(a)quark.com) and delete the original transmission, its attachments, and any copies without reading or saving in any manner. Thank you.

2 1