Boost C++ Libraries: Ticket #12050: error C2668: 'boost::begin' : ambiguous call to overloaded function

John Maddock — Sat, 12 Mar 2016 18:38:25 GMT

You need to specify what code causes the errors and which boost library you are using.

anonymous — Mon, 14 Mar 2016 09:08:32 GMT

You need to specify what code causes the errors and which boost library you are using.

This is one of the piece of code:-

Library: 1.34.1 1.

template<typename WritableRangeT>

inline void to_lower(

WritableRangeT& Input, const std::locale& Loc=std::locale())

{

std::transform(

begin(Input), end(Input), begin(Input), ::boost::algorithm::detail::to_lowerF<

typename range_value<WritableRangeT>::type >(Loc));

}

anonymous — Mon, 14 Mar 2016 09:40:56 GMT

Replying to anonymous:

Replying to johnmaddock:

You need to specify what code causes the errors and which boost library you are using.

This is one of the piece of code:-

Library: 1.34.1 1.

template<typename WritableRangeT>

inline void to_lower(

WritableRangeT& Input, const std::locale& Loc=std::locale())

{

std::transform(

begin(Input), end(Input), begin(Input), ::boost::algorithm::detail::to_lowerF<

typename range_value<WritableRangeT>::type >(Loc));

}

2.

John Maddock — Mon, 14 Mar 2016 12:08:49 GMT

Boost-1.34 is ancient, I doubt you'll get much help there.

And the code you posted still doesn't provide something we can reproduce with (ie a self contained test case), or indicate which boost library is causing the issue for you.

greatsaurav@… — Mon, 14 Mar 2016 12:51:49 GMT

The code shows error in case_conv.hpp. And I had pasted the piece of code too(above ). Our project requirement is to use Boost-1.34 only. So I am using it.

I am not able to understand that what info you want from me to get rid of this issue.

Note:- I had done copied boost 1_34_1 to "c:\Program Files (x86)\boost\" folder.

Do we have to do something else to use full fledged boost library ?

Michel Morin — Mon, 14 Mar 2016 15:05:11 GMT

I am not able to understand that what info you want from me to get rid of this issue.

ADL depends on the type of arguments, but that info is missing in this ticket. So we cannot reproduce the error. Also note that, since some compilers have bugs, it is helpful for developers to know what compiler (and which version) is used.

Unfortunately, Boost 1.34 is too old so you may get only a little help (even if you provide enough info) as John said. But anyway, here's a possible fix:

boost::begin (end) itself is not a customization point, so don't use it as an unqualifed call (i.e. begin(Input)); if you intend to use boost::begin, qualify begin with boost:: (i.e. boost::begin(Input)).

See the bottom of this page.

anonymous — Tue, 15 Mar 2016 08:38:33 GMT

I am using Microsoft Visual Studio Professional 2012. Version 11.0.50727.1 RTMREL

anonymous — Wed, 16 Mar 2016 11:24:55 GMT

Could you please suggest some good IDE/Compiler where we can execute the code.

Michel Morin — Wed, 16 Mar 2016 13:19:58 GMT

My guess is that the problem is caused by the ambiguity between boost::begin and std::begin. If that's the case, then a solution would be

Use more recent versions of Boost.
Add boost:: before begin (and end).
Use compilers (stdlibs) without std::begin, e.g. VS 2010.

If not, I can't be more helpful.

John Maddock — Wed, 16 Mar 2016 17:01:17 GMT

Indeed, and unless a self-contained test case is forthcoming, I suggest we close the issue.

status, severity changed; resolution set

Michel Morin — Thu, 17 Mar 2016 14:53:28 GMT

status new → closed
resolution → invalid
severity Showstopper → Problem

So let's close the ticket for now.

I also note that the ADL issue is already resolved in both Boost.StringAlgo and Boost.Range.