Re: [Boost-users] [string_algo] Case-insensitive keys in map with is_iless?

From: Pavol Droba (droba_at_[hidden])
Date: 2007-10-07 08:02:21

Hi,

is_iless works with characters, not strings. So you cannot use it to
compare std::string keys.

Regards,
Pavol

Boris wrote:
> Am I supposed to be able to use boost::algorithm::is_iless (see  
> http://www.boost.org/doc/html/boost/algorithm/is_iless.html) to create a  
> map with case-insensitive keys? I wonder as either it is broken in VS2005  
> or I do something wrong:
> 
> #include <boost/algorithm/string.hpp>
> #include <string>
> #include <map>
> 
> int main()
> {
> 	std::map<std::string, int, boost::algorithm::is_iless> m;
> 	m["test"] = 1;
> }
> 
> C:\Program Files\Microsoft Visual Studio 8\VC\include\xlocale(583) :
> error C2440: 'type cast' : cannot convert from 'unsigned char' to  
> 'std::basic_string<_Elem,_Traits,_Ax>'
> ...
> C:\Program Files\Microsoft Visual Studio 8\VC\include\xlocale(561) :
> error C2440: 'type cast' : cannot convert from  
> 'std::basic_string<_Elem,_Traits,_Ax>' to 'unsigned char'
> 
> The assignment causes the problem. If you use insert() you get the same  
> compiler error. Without the assignment the code compiles fine.
> 
> Boris
> 
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