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[Range.Ex / String.Algo] Ambiguous call to overload function "find"
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[Range.Ex / String.Algo] Ambiguous call to overload function "find"
by 梁绍池
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I use vc 9.0 to compile the following code with boost 1.39.0 and range_ex.
#include<string> #include<boost/algorithm/string.hpp> #include<boost/range/algorithm.hpp>
int main() { std::string s = "hello"; boost::find_first(s, "lo"); return 0; } The compiler will complain ambiguous call to overload function "find". I found there's also a "find" in boost/range/algorithm.hpp. Even worse when I change the type of "s" to const std::string, the compiler will resolute "find" call as the one in boost/range/algorithm.hpp
and reports an error "const_iterator is not a member of std::_String_const_iterator". Now I just indicated the "find" call in boost::find_first explicitly. Is there a better way to solve it?
Thanks! S.C. Leung
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by Neil Groves-3
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Hello!
On Fri, Jul 3, 2009 at 2:38 AM, 梁绍池 <shaochiliang@...> wrote: I use vc 9.0 to compile the following code with boost 1.39.0 and range_ex. I'm not sure why there should be any conflict. I will test this problem out over the weekend. Would you please clarify which RangeEx you are using. Are you using the latest version from the vault in the algorithm directory? I appreciate that these difficulties would not occur, if I had managed to get this code into the trunk of subversion.
Please accept my apologies for the problem. I shall report back to you by Monday 6 July 2009. Regards, Neil Groves _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by 梁绍池
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Hi!
I have downloaded Range.Ex uploaded at 26.04.2009 09:09. It seems the difficulties are still there. Thank you for your work! S.C. Leung
2009/7/3 Neil Groves <neil@...> Hello! _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by Neil Groves-3
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2009/7/3 S.C. Leung <shaochiliang@...>
Hi! The exact program you posted compiles without errors or warnings on Visual C++ 9. I installed Boost 1.39 and then copied over the RangeEx files. [...] 009/7/3 Neil Groves <neil@...>
This code compiles cleanly for me. I noticed that you are talking about "find" rather than "find_first" so I took the liberty of replacing the "find_first" with "find". This indeed produced a compiler error similar to the one you describe. However boost::find(s, "lo") does not match the boost/algorithm/string.hpp version because the second parameter should be a "Finder object used for searching". Please see: http://www.boost.org/doc/libs/1_39_0/doc/html/string_algo/reference.html#header.boost.algorithm.string.find_hpp It also does not match the RangeEx version because "find" is used to find an element, as opposed to a sub-sequence, from a range. Therefore I conclude that either, I have guessed the code snippet that causes the problem inaccurately, or that the code that produced the compiler error was simply incorrect. If I have guessed the code wrongly, would you please supply the exact code that reproduces the problem. I suspect that find_first is exactly the right solution. Please let me know either way. Regards, Neil Groves _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by 梁绍池
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That's too strange. Maybe the test environments between us are different so I want to send you the range_ex.zip I use.
By the way, the "find_first" really call the "find" by making a "Finder object" and that's where the resolution failed. I'm also not sure
if the compiler options have side effects so I post my options as below: /Od /D "_MBCS" /Gm /EHsc /RTC1 /MDd /Fo"Debug\\" /Fd"Debug\vc90.pdb" /W3 /nologo /c /ZI /TP /errorReport:prompt
Lastly, have you replaced std::string with const std::string? That will cause the "find" within "find_first" resoluted as the "find" in range/algorithm/find.hpp in my test environment.
Thank you for your work! S.C. Leung
2009/7/5 Neil Groves <neil@...> 2009/7/3 S.C. Leung <shaochiliang@...> _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by Thorsten Ottosen-3
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S.C. Leung skrev:
> That's too strange. Maybe the test environments between us are different > so I want to send you the range_ex.zip I use. > By the way, the "find_first" really call the "find" by making a "Finder > object" and that's where the resolution failed. I'm also not sure > if the compiler options have side effects so I post my options as below: > > /Od /D "_MBCS" /Gm /EHsc /RTC1 /MDd /Fo"Debug\\" /Fd"Debug\vc90.pdb" /W3 > /nologo /c /ZI /TP /errorReport:prompt > > Lastly, have you replaced std::string with const std::string? That will > cause the "find" within "find_first" resoluted as the "find" in > range/algorithm/find.hpp in my test environment. I think the problem might be related to ADL. All boost libraries should guard against this. For example, in the string library, forwarding calls should be to boost::algorithm::foo and also in the range library, forwarding calls should use boost::ranges::foo -Thorsten _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by 梁绍池
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Hello, Thorsten:
Have you test my case and had the same problem with me? Does it mean that the library should call the function explicitly? Thanks! S.C. Leung
2009/7/6 Thorsten Ottosen <thorsten.ottosen@...> S.C. Leung skrev: _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by Neil Groves-3
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On Mon, Jul 6, 2009 at 3:22 PM, S.C. Leung <shaochiliang@...> wrote: Hello, Thorsten: Did you try the patch for Boost.Algorithm that I supplied in my last post? This will confirm / deny accidental ADL as the cause. It is the next logical debugging step.
Regards, Neil Groves [...] _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by 梁绍池
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No, where can I get the patch. Is it in the range_ex.zip?
2009/7/6 Neil Groves <neil@...>
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by Neil Groves-3
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On Mon, Jul 6, 2009 at 5:42 PM, S.C. Leung <shaochiliang@...> wrote: No, where can I get the patch. Is it in the range_ex.zip? It's attached in this thread in a previous post. It's not a patch for range because range correctly has protection against accidental ADL. If the problem is accidental ADL the defect is in Boost.Algorithm. I, however, cannot explain how a std::string would cause an ADL problem internally within a boost namespace. I simply provided the file to eliminate or confirm Thorsten's hypothesis. I'll send the file again to you at your email address. It needs to replace <boost/algorithm/string/find.hpp>. Regards, Neil Groves
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by 梁绍池
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The patch of <boost/algorithm/string/find.hpp> did work.
Then what's the conclusion? Could anyone reproduce my difficulty? Or it is just my missing something when using find_first with "boost/range/algorithm.hpp"?
2009/7/7 Neil Groves <neil@...>
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Re: [Range.Ex / String.Algo] Ambiguous call to overload function "find"
by Neil Groves-3
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On Tue, Jul 7, 2009 at 2:25 AM, S.C. Leung <shaochiliang@...> wrote: The patch of <boost/algorithm/string/find.hpp> did work. The conclusion is that this problem is a defect in Boost.Algorithm. This library suffers from unprotected accidental ADL. I am about to request that this is fixed, or that I am given access to fix the problem. Thank you for your patience and assistance with this issue. Best wishes, Neil Groves [...] _______________________________________________ Boost-users mailing list Boost-users@... http://lists.boost.org/mailman/listinfo.cgi/boost-users |
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