- Boost-users - lists.boost.org

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 >

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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!

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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.

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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

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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.

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How to Exit from boost threads
by gauravz 27 Mar '06

27 Mar '06

Hi friends Could some 1 please tell me how to trap the boost exit functions...I am using Boost threads in my client server application. Using to control sendto and recvfrom udp functions. Client sends information to server but server doesnt recive in information but rather goes into some loop and never comes out of it. And last this code is working fine in command promt i.e, in console project(c++) but its not working in windows (c++) mode. Regards gaurav -- View this message in context: http://www.nabble.com/How-to-Exit-from-boost-threads-t1348252.html#a3606850 Sent from the Boost - Users forum at Nabble.com.

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safe assign of int to enum
by Oliver.Kowalke＠infineon.com 27 Mar '06

27 Mar '06

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

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[Ublas] Lack of arbitrary base
by Sohail Somani 26 Mar '06

26 Mar '06

Hi, Is there some reason that Ublas decided not to (consistently) allow aribtrary index bases for its matrix types like multiarray and blitz++? I can't quite figure it out, except for some measured (perceived?) performance impact. Thanks Sohail

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boost::gregorian::date_period,how to increment/decrement the period
by george 26 Mar '06

26 Mar '06

hello! boost::gregorian::days size(1); boost::gregorian::date_period tmp(period.begin()+=size,period.end()-=size); period=tmp; is there any better way to increment/decrement the period object I want period.begin+=size; period.end()-=size to be permanent to period but it doesn't,it returns an object... any idea?? thanks for any help.

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[Test] unit_test_framework link problem
by Chris Hoeppler 26 Mar '06

26 Mar '06

Hi, Up to boost version 1.33.1 I used to be able to successfully build my unitests, which define a testsuite with the library function init_unit_test_suite, like this: g++ -o build/debug/test/devs/test_shdevlib.o -c -g -Wall -ftemplate-depth-255 -O0 -fno-inline -I. -I/home/boost/src/boost-built test/devs/test_shdevlib.cpp g++ -o build/debug/test/devs/test_shdevlib -Wl,-rpath-link,. -rdynamic build/debug/test/devs/test_shdevlib.o -L/home/boost/src/boost-built/stage/lib -lboost_unit_test_framework-gcc-d -ldl With the current cvs version of boost this doesn't work any more. Linking fails with the following error: /usr/lib/gcc-lib/i586-suse-linux/3.3.3/../../../crt1.o(.text+0x18): In function `_start': ../sysdeps/i386/elf/start.S:98: undefined reference to `main' collect2: ld returned 1 exit status This is on linux with gcc 3.3.3. Is this usage of the UTF not supported any more? How do I have to change the way I'm building my unit tests? Linking to the static version? TIA, Chris

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