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

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

Hi!

I get the error C2668 if i try to compile the following code(xpressive example from docs):

#include <string>

#include <iostream>

#include

#include

#include <map>

using namespace boost::xpressive;

int main()

{

std::map 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>(T &)' with [ T=std::mapstd::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>(_Ty &)' [found using argument-dependent lookup] with [ _Ty=std::mapstd::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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