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Boost_static_assert Error Message

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Chapter31.Boost.StaticAssert John Maddock Steve Cleary Copyright © 2000, 2005 Steve Cleary and John Maddock Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt ) Granted, most people figure out what a static assertion is supposed to be, but still, the error message gave no clue about what might have gone wrong... Tips for work-life balance when doing postdoc with two very young children and a one hour commute In km/h, what actually is the "speed" of Andromeda away from us: cosmologically? You don't think ****************** error-message:: ********************* is more likely to get noticed and pasted into a problem report? > It allows to put some hints on the > problem source in http://hammerofcode.com/error-message/box-error-message-x.php

oops, I take it back. Connecting rounded squares What does "make -j n V=m" mean? For me, as a Boost user, such problem does not exist because, obviously, I always have actual copy of my code when I get static assertions. >>> How do you manage For newer compilers BOOST_STATIC_ASSERT will be just a macro defining standard static assert.

Boost_static_assert Msg

In theory the compiler should silently ignore duplicate 89 typedef declarations, however many do not do so (and even if they do they are 90 entitled to emit warnings in such In reply to this post by Dave Abrahams David Abrahams wrote: > Andrey Semashev wrote: > >> As a user and a library writer I would ask to keep BOOST_STATIC_ASSERT >> In reply to this post by Dave Abrahams David Abrahams wrote: > Yesterday someone on the user's list posted a message > (http://article.gmane.org/gmane.comp.lib.boost.user/36884) about a > "compilation error in the boost For several releases now we've had a suite of static assertion tools that give far superior error messages to what BOOST_STATIC_ASSERT can provide (http://www.boost.org/doc/libs/1_35_0/libs/mpl/doc/refmanual/asserts.html).

If Energy is quantized, does that mean that there is a largest-possible wavelength? Suppose we have a template-class that requires an unsigned integral type with at least 16-bits of precision as a template argument, we can achieve this using something like this: #include I like the ones that say both what is wrong and what to do to fix it, but that's often hard to do in limited space. --Beman _______________________________________________ Unsubscribe & other Static_assert C++11 In theory the compiler should silently ignore duplicate typedef declarations, however many do not do so (and even if they do they are entitled to emit warnings in such cases).

Usage: STATIC_ASSERT(expression, message); When the static assertion test fails, a compiler error message that somehow contains the STATIC_ASSERTION_FAILED_AT_LINE_xxx_message is generated. Boost_static_assert Invalid Application Of Sizeof We can verify this at compile time as follows: #include #include #include #include namespace my_conditions { BOOST_STATIC_ASSERT(std::numeric_limits::digits >= 32); BOOST_STATIC_ASSERT(WCHAR_MIN >= 0); } // namespace my_conditions The As a user and a library writer I would ask to keep BOOST_STATIC_ASSERT as it is without deprecation. Robert Ramey _______________________________________________ Unsubscribe & other changes: http://lists.boost.org/mailman/listinfo.cgi/boost Andrey Semashev-2 Reply | Threaded Open this post in threaded view ♦ ♦ | Report Content as Inappropriate ♦ ♦ Re: Deprecate

In this specific case, I changed BOOST_STATIC_ASSERT to BOOST_STATIC_WARNING - which suffers from the same problem but may be better for some users. Static_assert Gcc If you don't need to support all the compilers Boost supports you can just pick the right definition for your compiler and omit the rest of the #ifdefs in that file. You don't find those asterixes make things stand out sufficiently? > IMHO, most of the time users will eventually want to see the > comment near the check anyway (and with static_assert_test_fail_4.cpp No Illustrates failure at non-template class scope.

Boost_static_assert Invalid Application Of Sizeof

They too can be useful, you know. #include #include "boost/type_traits.hpp" #include "boost/static_assert.hpp" template class only_compatible_with_integral_types { BOOST_STATIC_ASSERT(boost::is_integral::value); }; With this assertion, trying to instantiate the class only_compatible_with_integral_types with Also, I should add that when the assertion succeeds, it works as expected. Boost_static_assert Msg Sent from my iPhone On Jun 23, 2008, at 6:48 PM, Steven Watanabe <[hidden email]> wrote: > AMDG > > David Abrahams wrote: >> Without knowing anything about how good Assert Error Message Java Of course, the only way to do that is to have the compiler generate an error, and while that is quite trivial (I've inadvertently done it many thousand times), it's not

Free forum by Nabble Edit this page http://hammerofcode.com/error-message/bo-error-message-pdf.php By deprecating it we effectively forbid to use it. Is "The empty set is a subset of any set" a convention? I'm using this macro on a regular basis > and found no problems with it. Assert Error Message Python

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Privacy policy To use Google Groups Discussions, please enable JavaScript in your browser settings, and then refresh this page. . We'll use a predicate called is_integral, which performs a compile time evaluation of its argument and, as you might guess from its name, indicates whether that type is an integral type.[2] How is that group different from the group of Boost (or non-Boost) library maintainers? >>> I wouldn't like to move to BOOST_MPL_ASSERT since (a) it would require >>> to change my Check This Out Which users?

The macro BOOST_STATIC_ASSERT works by generating an typedef declaration, and since the typedef must have a name, the macro generates one automatically by mangling a stub name with the value Boost_static_assert Example My copy of oserializer.hpp doesn't even have a line 567, and the posting doesn't indicate which version the user has. The macro can be used at namespace scope, if there is some requirement must always be true; generally this means some platform specific requirement.

The general conclusion was that the good of a static assert 216 working at namespace, function, and class scope outweighed the ugliness of a macro. 217 218 [endsect] 219 220 [section:test

Rather than asserting that this precondition holds at runtime, we can enforce it at compile time using a static assertion. I have boiled it down to this: #include namespace StaticChecks { BOOST_STATIC_ASSERT_MSG( false, "Where is my error message?" ); } The specified error message is nowhere to be seen. the part of the backtrace they paste into their problem reports > doesn't contain the information you need to know what went wrong. > The point is that BOOST_MPL_ASSERT does a Boost_static_assert Implementation And since MPL is and "advanced" library - most users aren't going to become familiar with it until they already spend a significant amount of time with boost.

The comment is in the code. >> 3. On Fri, Jun 20, 2008 at 12:41 PM, David Abrahams <[hidden email]> wrote: > Hi David, [snip - bad user experience with BOOST_STATIC_ASSERT] > For several releases now we've had a You > don't think ****************** error-message:: ********************* is > more likely to get noticed and pasted into a problem report? > >> It allows to put some hints on the >> this contact form Note that if the condition is true, then the macro will generate neither code nor data - and the macro can also be used at either namespace, class or function scope.

No, it would have to be something like: BOOST_MPL_ASSERT(mpl::bool_<(x)>) > I like how easy it is to use BOOST_STATIC_ASSERT: > > #include > > BOOST_STATIC_ASSERT(( /*whatever*/ My table doesn't fit; what are my options? In reply to this post by Dave Abrahams David Abrahams wrote: > Yesterday someone on the user's list posted a message > (http://article.gmane.org/gmane.comp.lib.boost.user/36884) about a > "compilation error in the boost When `BOOST_STATIC_ASSERT` is 83 used at either class or function scope then each use of `BOOST_STATIC_ASSERT` 84 is guaranteed to produce a name unique to that scope (provided you only use

no clue to the user, and no > clue to anyone reading his posting, unless they were going to look up > the line in the source file... users don't look at the code > > True, at least they don't want to. > >> 2. Not the answer you're looking for? Else the macro is treated as BOOST_STATIC_ASSERT(condition) share|improve this answer edited Apr 28 at 8:35 answered Apr 28 at 8:25 Ville-Valtteri Tiittanen 1,144221 add a comment| Your Answer draft saved

more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation oops, I take it back. Perhaps you meant something else, such as... > That makes BOOST_STATIC_ASSERT usage similar > to BOOST_MPL_ASSERT, though. "...complicate condition expressions with types and type traits." Well, if you're using types and In reply to this post by Dave Abrahams David Abrahams wrote: > I think it's time to deprecate > BOOST_STATIC_ASSERT or at *least* put a prominent note > in its documentation

Upper-case STATIC_ASSERTION_FAILURE do highlight error just as well as those asterixes. >> IMHO, most of the time users will eventually want to see the >> comment near the check anyway (and This is what BOOST_STATIC_ASSERT does, by providing consistent output for compile time assertions on a wide range of compilers. I know there is something called static_assert() in the C++0x standart, but I'd like not to use any C++0x features. typedef typename std::iterator_traits< RandomAccessIterator >::iterator_category cat; BOOST_STATIC_ASSERT( (boost::is_convertible< cat, const std::random_access_iterator_tag&>::value)); // // detail goes here...

One option is to add a static assertion at the top level of the template, in that case if the condition is not met, then an error will be generated in