[compressed_pair] Broken compilers workaround suggestion
Hi, Recently I've discovered that Digital Mars compiler (version 8.42n) has problems when compiling boost::compressed_pair. The problem is in the member functions first() and second() in cases when compressed_pair is derived from either first or second type. To fix the problem, *this must be explicitly converted to the return type, so the functions would look like this: second_reference second() { return static_cast<second_reference>(*this); } instead of the way they're implemented now: second_reference second() { return *this; } If the problem wasn't mentioned before, then I'd suggest to fix it. The solution is quite easy to introduce and AFAICT has no negative side effects. Does anybody object to this? The changes have to be done in the following lines: 158, 159, 203, 204, 244, 245, 247, 248, 280, 281 of boost/detail/compressed_pair.hpp file. Also, the comment in line 256 is out-of-date after changes made by John Maddock in 25 Jan 2004: // Note does not actually store an instance of T2 at all - // but reuses T1 base class for both first() and second(). This could be removed as well. Best regards, Robert ---------------------------------------------------------------------- Kliknij po wiecej! >>> http://link.interia.pl/f18ed
"Robert Kawulak" <tigrisek@interia.pl> writes:
Hi,
Recently I've discovered that Digital Mars compiler (version 8.42n) has problems when compiling boost::compressed_pair. The problem is in the member functions first() and second() in cases when compressed_pair is derived from either first or second type. To fix the problem, *this must be explicitly converted to the return type, so the functions would look like this:
second_reference second() { return static_cast<second_reference>(*this); }
Should be boost::implicit_cast<second_reference>(*this);
instead of the way they're implemented now:
second_reference second() { return *this; }
If the problem wasn't mentioned before, then I'd suggest to fix it. The solution is quite easy to introduce and AFAICT has no negative side effects. Does anybody object to this?
I don't object, but the obfuscation of the code is a negative side effect. -- Dave Abrahams Boost Consulting www.boost-consulting.com
Hi,
From: David Abrahams
second_reference second() { return static_cast<second_reference>(*this); }
Should be boost::implicit_cast<second_reference>(*this);
Hmmm... I've tried to replace static_cast with implicit_cast, but then the compilation error with DM comes back :-/
If the problem wasn't mentioned before, then I'd suggest to fix it. The solution is quite easy to introduce and AFAICT has no negative side effects. Does anybody object to this?
I don't object, but the obfuscation of the code is a negative side effect.
100% right :-) By saying 'negative side effects' I meant no new compilation or usage problems introduced by this fix. Of course the cleaner code the better, but OTOH adding a few casts into the implementation seems rather a low price to pay for better portability. What is the procedure for adding fixes like this? Is the author of the file responsible for this, or should I provide the fixed version? Best regards, Robert
In a different thread At 5:55 PM -0500 1/23/06, David Abrahams wrote:
second_reference second() { return static_cast<second_reference>(*this); }
Should be boost::implicit_cast<second_reference>(*this);
I didn't remember running across implicit_cast, so went looking for its documentation. I found various uses and tests (in the conversion library), but found no documentation for implicit_cast in the boost_1_33_1 release.
Kim Barrett <kab@irobot.com> writes:
In a different thread
At 5:55 PM -0500 1/23/06, David Abrahams wrote:
second_reference second() { return static_cast<second_reference>(*this); }
Should be boost::implicit_cast<second_reference>(*this);
I didn't remember running across implicit_cast, so went looking for its documentation. I found various uses and tests (in the conversion library), but found no documentation for implicit_cast in the boost_1_33_1 release.
Right. But so what? -- Dave Abrahams Boost Consulting www.boost-consulting.com
"David Abrahams" <dave@boost-consulting.com> wrote in message news:ufyndfwny.fsf@boost-consulting.com...
Kim Barrett <kab@irobot.com> writes:
I didn't remember running across implicit_cast, so went looking for its documentation. I found various uses and tests (in the conversion library), but found no documentation for implicit_cast in the boost_1_33_1 release.
Right. But so what?
-- Dave Abrahams
Well, a one or two line comment in its header file (implicit_cast.hpp), at the very least, describing what it does wouldn't be too much to ask, in my opinion. Since, historically, you've been the champion of fighting against terse documentation and ambiguous/overly technical, yet meaning nothing to the average Joe documentation, I think you would agree with the first statement. Just my gratuitous 2 cents, Michael Goldshteyn
"Michael Goldshteyn" <mgoldshteyn@comcast.net> wrote
Well, a one or two line comment in its header file (implicit_cast.hpp), at the very least, describing what it does wouldn't be too much to ask, in my opinion.
Seriously Its best to leave implicit_cast alone. The reason its not documented is because if it was bad things would happen. Its like those what were they - japanese pictures ? where the artist deliberately made one mistake. Without that everything in the boost distro would be perfect and thats asking for trouble. Thats why its seriously best to leave it alone. If any one wants to know what it does, I have knocked this slice of code together to explain that it actually does nothing at all.. #include <boost/implicit_cast.hpp> template <typename T> struct value_typeA{ T val; template <typename T1> explicit value_typeA( T1 const & t) : val((t)){} }; template <typename T> struct value_typeB{ T val; template <typename T1> explicit value_typeB( T1 const & t) : val(boost::implicit_cast<T>(t)){} }; int main() { value_typeA<double> vA0(1); value_typeA<value_typeA<double> >vA1(vA0); value_typeA<value_typeA<double> >vA2(1); value_typeB<double> vB0(1); value_typeB<value_typeB<double> >vB1(vB0); value_typeB<value_typeB<double> >vB2(1); } regards Andy Little
I'm joking of course. I think it really needs someone who knows a bit about the details for this two phase conversion thingy to write a bit of documentation and put it in say <libs/conversion/cast.htm> For myself I know what it does, but dont know how to describe it, else i'd write it. regards Andy Little
"Andy Little" <andy@servocomm.freeserve.co.uk> writes:
I'm joking of course. I think it really needs someone who knows a bit about the details for this two phase conversion thingy to write a bit of documentation and put it in say <libs/conversion/cast.htm>
2-phase conversion?
For myself I know what it does, but dont know how to describe it, else i'd write it.
It's simple: it's a cast you use when the source type is implicitly convertible to the target type, to force the implicit conversion. It's less liberal than static_cast, which will convert in the opposite direction. Where's the mystery? -- Dave Abrahams Boost Consulting www.boost-consulting.com
"David Abrahams" wrote
It's simple: it's a cast you use when the source type is implicitly convertible to the target type, to force the implicit conversion. It's less liberal than static_cast, which will convert in the opposite direction.
Hows the attached? Its <libs/conversion/index.html> with the above info on implicit_cast added. regards Andy Little
"Andy Little" <andy@servocomm.freeserve.co.uk> wrote in message news:dr8qlg$ken$1@sea.gmane.org...
"David Abrahams" wrote
It's simple: it's a cast you use when the source type is implicitly convertible to the target type, to force the implicit conversion. It's less liberal than static_cast, which will convert in the opposite direction.
Hows the attached? Its <libs/conversion/index.html> with the above info on implicit_cast added.
I can see the attachments mangled. Here's the text. regards Andy Little <html> <head> <meta http-equiv="Content-Language" content="en-us"> <meta http-equiv="Content-Type" content="text/html; charset=windows-1252"> <meta name="GENERATOR" content="Microsoft FrontPage 5.0"> <meta name="ProgId" content="FrontPage.Editor.Document"> <title>Boost Conversion Library</title> </head> <body bgcolor="#FFFFFF" text="#000000"> <h1><img border="0" src="../../boost.png" align="center" width="277" height="86">Boost Conversion Library</h1> <p>The Conversion Library improves program safety and clarity by performing otherwise messy conversions. It includes cast-style function templates designed to complement the C++ Standard's built-in casts.</p> <p>To reduce coupling, particularly to standard library IOStreams, the Boost Conversion Library is supplied by several headers:</p> <ul> <li>The <a href="cast.htm">boost/cast</a> header provides <b>polymorphic_cast<></b> and <b>polymorphic_downcast<></b> to perform safe casting between polymorphic types.<br> </li> <li>The <a href="lexical_cast.htm">boost/lexical_cast</a> header provides <b>lexical_cast<></b> general literal text conversions, such as an <code>int</code> represented as a <code>string</code>, or vice-versa.</li> <li>The <a href="../../boost/implicit_cast.hpp">boost/implicit_cast</a> header provides <b>implicit_cast<></b> which is used when the source type is implicitly convertible to the target type, to force the implicit conversion. It's less liberal than static_cast, which will convert in the opposite direction..<br> </ul> <hr> <p>Revised <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %B, %Y" startspan -->Jan 25, 2006<!--webbot bot="Timestamp" endspan i-checksum="30348" --> </p> </body> </html>
"Andy Little" <andy@servocomm.freeserve.co.uk> writes:
"Andy Little" <andy@servocomm.freeserve.co.uk> wrote in message news:dr8qlg$ken$1@sea.gmane.org...
"David Abrahams" wrote
It's simple: it's a cast you use when the source type is implicitly convertible to the target type, to force the implicit conversion. It's less liberal than static_cast, which will convert in the opposite direction.
Hows the attached? Its <libs/conversion/index.html> with the above info on implicit_cast added.
I can see the attachments mangled. Here's the text.
In future send your attachment as a patch and it will come through OK. So, thanks, but it's not really sufficient. Linking to the header is really unacceptable, IMO. It should link to an HTML file with a specification of the signature of implicit cast, its requirements, effects, etc., and preferably, an example. P.S. I can see that I already wrote a test for implicit_cast, so consider yourself lucky that I'm not asking you for one of those ;-) P.P.S. I'm actually very grateful that you've done anything; I'm just trying to scam you into finishing the job and doing it right ;-) -- Dave Abrahams Boost Consulting www.boost-consulting.com
"David Abrahams" wrote
In future send your attachment as a patch and it will come through OK.
I am have attached 3 items including the patch (because My last attach test went OK, but unfortunately I have to keep changing settings for something else. I hope I got it right now.( Think its got to be UUencode FWIW) If not I'll try again). implicit_cast.qbk and Jamfile to go in new directory <libs/conversion/implicit_cast/> patch is for <libs/conversion/index.html> The jamfile BTW is just based on the Boost.Typeof doc jamfile by Peder Holt. I dont know too much about it, but it seems to work ok.
So, thanks, but it's not really sufficient. Linking to the header is really unacceptable, IMO. It should link to an HTML file with a specification of the signature of implicit cast, its requirements, effects, etc., and preferably, an example.
There is a reasonable skeleton there I hope. Obviously you are better placed to rewrite the text...
P.S. I can see that I already wrote a test for implicit_cast, so consider yourself lucky that I'm not asking you for one of those ;-)
I'll be interested as I need some expected to fail tests, and I presume there should be some there.
P.P.S. I'm actually very grateful that you've done anything; I'm just trying to scam you into finishing the job and doing it right ;-)
Its ten past 2 in the morning here in the U.K, but I'm not saying that to make feel guilty in any way ;-) hmm... hope the attachments dont get mangled... If they do I'll send them embedded in the message. regards Andy Little begin 666 libs_conversion_index_html.patch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Hi David, Was the documentaion I provided for implicit_cast helpful? BTW would there be any point in an is_implicitly_convertible<A,B> type_trait? regards Andy Little
BTW would there be any point in an is_implicitly_convertible<A,B> type_trait?
That's what is_convertible does now: tests for implicit convertibility. There's no way you can test for other kinds of valid (but explicit) conversions I believe. John.
"John Maddock" <john@johnmaddock.co.uk> wrote in message news:00b601c6258d$bb5f76d0$a9051c52@fuji...
BTW would there be any point in an is_implicitly_convertible<A,B> type_trait?
That's what is_convertible does now: tests for implicit convertibility. There's no way you can test for other kinds of valid (but explicit) conversions I believe.
Oops sorry for being too lazy to try that out before posting. Perhaps it would be useful to put that in the documentation for implicit_cast e.g implicit_cast<t>(S) will succeed wherever is_convertible<S,T>::value ==true and will cause a compile time error wherever implicit_cast<t>(S) will succeed wherever is_convertible<S,T>::value ==false. Maybe could even do the reverse too if implicit_cast was documented. BTW Its a real pain that the parameter order for is_convertible isnt the other way round IMO. Its confusing and error prone because casts go the other way. Is there a reason for it? Getting back to the original topic (or trying to anyway ).. So is the documentation I provided for implicit_cast useful? regards Andy Little
"Andy Little" <andy@servocomm.freeserve.co.uk> writes:
"John Maddock" <john@johnmaddock.co.uk> wrote in message news:00b601c6258d$bb5f76d0$a9051c52@fuji...
BTW would there be any point in an is_implicitly_convertible<A,B> type_trait?
That's what is_convertible does now: tests for implicit convertibility. There's no way you can test for other kinds of valid (but explicit) conversions I believe.
Oops sorry for being too lazy to try that out before posting. Perhaps it would be useful to put that in the documentation for implicit_cast e.g
implicit_cast<t>(S) will succeed wherever is_convertible<S,T>::value ==true
I think that would be a lie for some reasonable definitions of "succeed": struct foo { operator int() { throw "fooled ya"; } };
and will cause a compile time error wherever implicit_cast<t>(S) will succeed ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ eh? wherever is_convertible<S,T>::value ==false. Maybe could even do the reverse too if implicit_cast was documented.
BTW Its a real pain that the parameter order for is_convertible isnt the other way round IMO. Its confusing and error prone because casts go the other way. Is there a reason for it?
"from, to" is the usual convention except for old-style things like strcpy.
Getting back to the original topic (or trying to anyway ).. So is the documentation I provided for implicit_cast useful?
Haven't had time to dig into them, but they seemed pretty good on the surface. I'll try to find time to check them in. Thanks, -- Dave Abrahams Boost Consulting www.boost-consulting.com
"David Abrahams" wrote Andy Little wrote
implicit_cast<t>(S) will succeed wherever is_convertible<S,T>::value ==true
I think that would be a lie for some reasonable definitions of "succeed":
OK how about implicit_cast<t>(S) will usually 1 succeed if boost::is_convertible<S,T>::value is true, but will always cause a compile_time error if boost::is_convertible<S,T>::value is false. ------------ [note1] The following is one situation where implicit_cast wont succeed struct foo { operator int() { throw "fooled ya"; } }; FWIW enclosed updated version of <libs/implicit_cast/implicit_cast.qbk> together with generated html regards Andy Little
"Andy Little" <andy@servocomm.freeserve.co.uk> writes:
"David Abrahams" wrote Andy Little wrote
implicit_cast<t>(S) will succeed wherever is_convertible<S,T>::value ==true
I think that would be a lie for some reasonable definitions of "succeed":
OK how about
implicit_cast<t>(S) will usually 1 succeed if boost::is_convertible<S,T>::value is true, but will always cause a compile_time error if boost::is_convertible<S,T>::value is false.
------------ [note1]
The following is one situation where implicit_cast wont succeed ^ missing apostrophe
struct foo { operator int() { throw "fooled ya"; } };
FWIW enclosed updated version of <libs/implicit_cast/implicit_cast.qbk> together with generated html
The index.html file is mangled. Try using a different MIME type when enclosing it (or changing the extension). -- Dave Abrahams Boost Consulting www.boost-consulting.com
"David Abrahams" wrote
The index.html file is mangled. Try using a different MIME type when enclosing it (or changing the extension).
Attached implicit_cast_index_html.txt should be <libs/conversion/implicit_cast/html/index.html> implicit_cast.qbk should be <libs/conversion/implicit_cast/implicit_cast.qbk> Prefer this version of implicit_cast.qbk because closing brace with no tab to left-margin in one code example messes up html output of previous version. I also managed to cure some verbiage this time. 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At 12:13 PM +0000 1/30/06, Andy Little wrote:
Getting back to the original topic (or trying to anyway ).. So is the documentation I provided for implicit_cast useful?
It is to me (the nagging OP). Thank you. The usage in the example you provided is quite interesting and instructive, and completely not a usage that had occurred to me. I would guess that replacing a static_cast with a less liberal implicit_cast would be the more common use, but perhaps that is sufficiently obvious that it doesn't need an example.
"Kim Barrett" wrote
At 12:13 PM +0000 1/30/06, Andy Little wrote:
Getting back to the original topic (or trying to anyway ).. So is the documentation I provided for implicit_cast useful?
It is to me (the nagging OP). Thank you.
The usage in the example you provided is quite interesting and instructive, and completely not a usage that had occurred to me. I would guess that replacing a static_cast with a less liberal implicit_cast would be the more common use, but perhaps that is sufficiently obvious that it doesn't need an example.
The merit in my example is that it is a realistic situation where I have needed to use implicit_cast, however there is also merit in keeping things as simple as possible so an example showing a very obvious use of implicit_cast might be better. David Abrahams might well prefer it, as might I. regards Andy Little
"Michael Goldshteyn" <mgoldshteyn@comcast.net> writes:
"David Abrahams" <dave@boost-consulting.com> wrote in message news:ufyndfwny.fsf@boost-consulting.com...
Kim Barrett <kab@irobot.com> writes:
I didn't remember running across implicit_cast, so went looking for its documentation. I found various uses and tests (in the conversion library), but found no documentation for implicit_cast in the boost_1_33_1 release.
Right. But so what?
-- Dave Abrahams
Well, a one or two line comment in its header file (implicit_cast.hpp), at the very least, describing what it does wouldn't be too much to ask, in my opinion. Since, historically, you've been the champion of fighting against terse documentation and ambiguous/overly technical, yet meaning nothing to the average Joe documentation, I think you would agree with the first statement.
Oh, I agree. It's just not an "official" part of any Boost library yet. Since I am an author of the cast library I could slip it in there without too much formality, but I haven't had time to write docs or tests. -- Dave Abrahams Boost Consulting www.boost-consulting.com
If the problem wasn't mentioned before, then I'd suggest to fix it. The solution is quite easy to introduce and AFAICT has no negative side effects. Does anybody object to this?
OK will apply.
Also, the comment in line 256 is out-of-date after changes made by John Maddock in 25 Jan 2004:
Well spotted, I'll update that with the rationale for the change. Thanks, John.
participants (7)
-
Andy Little -
David Abrahams -
John Maddock -
Kim Barrett -
Michael Goldshteyn -
Robert Kawulak -
Robert Kawulak