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#include <sstream>
 
class Uri
{
};
 
template<class TData, class TStr>
    inline TData fromString(const TStr &str)
    {
    std::stringstream oss;
    oss << str;
    TData t;
    oss >> t;
    return t;
    }
 
    class StringBuilder
    {
    public:
    inline operator const std::string () const
    {
    return oss.str();
    }
 
    private:
    std::ostringstream oss;
    };
 
    namespace LibFacebookCpp
    {
 
    struct PagingInfo
    {
    PagingInfo(unsigned int offset_, unsigned int limit_) : offset(offset_),   limit(limit_) { }
 
    bool IsValid() const { return 0 != limit; }
    void GetUri(Uri *uri) const
    {
    uri->query_params["limit"] = StringBuilder() << offset;
    uri->query_params["offset"] = StringBuilder() << limit;
    }
 
    unsigned int offset, limit;
    };
 
    }

prog.cpp: In member function 'void LibFacebookCpp::PagingInfo::GetUri(Uri*) const':
prog.cpp:39:10: error: 'class Uri' has no member named 'query_params'
prog.cpp:39:53: error: no match for 'operator<<' in 'StringBuilder() << ((const LibFacebookCpp::PagingInfo*)this)->LibFacebookCpp::PagingInfo::offset'
prog.cpp:40:10: error: 'class Uri' has no member named 'query_params'
prog.cpp:40:54: error: no match for 'operator<<' in 'StringBuilder() << ((const LibFacebookCpp::PagingInfo*)this)->LibFacebookCpp::PagingInfo::limit'

Standard output is empty