Re: [Boost-users] boost::xpressive Error 2668 call to amibous function

Subject: Re: [Boost-users] boost::xpressive Error 2668 call to amibous function
From: niXman (i.nixman_at_[hidden])
Date: 2011-09-07 17:05:20

Hi Jens!

you need a ref() function from namespace boost::xpressive.
like this: http://liveworkspace.org/code/a5de4abb522fb95f5636640af604b349

Regards! niXman.

2011/9/8 Jens Saathoff <jensesaat_at_[hidden]>

> Hi!
>
> I get the error C2668 if i try to compile the following code(xpressive
> example from docs):
>
> #include <string>
>
> #include <iostream>
>
> #include <boost/xpressive/xpressive.hpp>
>
> #include <boost/xpressive/regex_actions.hpp>
>
> #include <map>
>
>  using namespace boost::xpressive;
>
>  int main()
>
> {
>
> 	std::map<std::string, int> result;
>
> 	std::string str("aaa=>1 bbb=>23 ccc=>456");
>
>  	// Match a word and an integer, separated by =>,
>
> 	// and then stuff the result into a std::map<>
>
> 	sregex pair = ( (s1= +_w) >> "=>" >> (s2= +_d) )[ ref(result)[s1] = as<int>(s2) ];
>
>  	// Match one or more word/integer pairs, separated
>
> 	// by whitespace.
>
> 	sregex rx = pair >> *(+_s >> pair);
>
>  	if(regex_match(str, rx))
>
> 	{
>
> 		std::cout << result["aaa"] << '\n';
>
> 		std::cout << result["bbb"] << '\n';
>
> 		std::cout << result["ccc"] << '\n';
>
> 	}
>
>  	return 0;
>
> }
>
>
>
> The complete error:
>
> D:\Projekte\xpressive-test\main.cpp:29: Fehler:C2668: 'boost::xpressive::ref' : ambiguous call to overloaded function
> D:\Frameworks\boost\boost_147\boost/xpressive/regex_actions.hpp(850): could be 'const boost::xpressive::reference<T> boost::xpressive::ref<std::map<_Kty,_Ty>>(T &)'
> with
> [
>     T=std::map<std::string,int>,
>     _Kty=std::string,
>     _Ty=int
> ]
> C:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\INCLUDE\xrefwrap(439): or       'std::tr1::reference_wrapper<_Ty> std::tr1::ref<std::map<_Kty,int>>(_Ty &)' [found using argument-dependent lookup]
> with
> [
>     _Ty=std::map<std::string,int>,
>     _Kty=std::string
> ]
> while trying to match the argument list '(std::map<_Kty,_Ty>)'
> with
> [
>     _Kty=std::string,
>     _Ty=int
> ]
>
>
>
> What's the problem here?
>
>
> Thank you very much!
>
>
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