On 06/26/2012 08:50 PM, Allan Nielsen wrote:

Hi,

I'm developing for an embedded environment where we do not have a complete c++ standard library available, and one of the things missing is std::locale.

But even without this feature, I would very much like to use the boost string algorithms ( split, tokenize, etc ). The only problem is that they depends on std::locale. I have been looking around in the source code, trying to see how easy it would be to add the needed ifdef's to make it work without std::locale. Most of the code looks straight forward to modify, but I'm stuck on this function:

struct is_classifiedF : public predicate_facade { // Boost.ResultOf support typedef bool result_type;

// Constructor from a locale is_classifiedF(std::ctype_base::mask Type, std::locale const & Loc = std::locale()) : m_Type(Type), m_Locale(Loc) {} // Operation template<typename CharT> bool operator()( CharT Ch ) const { return std::use_facet< std::ctype<CharT>

...

(m_Locale).is( m_Type, Ch ); }

private: std::ctype_base::mask m_Type; std::locale m_Locale; };

I know what the code does, I just do not know how it does it. This is without a doubt because I know nothing about locale, facet, etc.

What I would like is another version of this struct which did not depend on std::locale, but simply assumed that the local used is "C". Something like this:

struct is_classifiedF : public predicate_facade { typedef bool result_type;

is_classifiedF(std::ctype_base::mask Type) : m_Type(Type) {}

template<typename CharT> bool operator()( CharT Ch ) const { // Write something here }

private: std::ctype_base::mask m_Type; };

But as I do not understand the meaning/encoding of std::ctype_base::mask m_Type I found it hard to write the missing function body.

So I could use some pointers/hints on how to implement this.

See, e.g., the GNU libstdc++ docs: < http://gcc.gnu.org/onlinedocs/gcc-4.7.1/libstdc++/api/a00617.html>. It is a mask of given isfoo (e.g., isalnum(), etc.) character type query function. -- VZ