c++ - Facet ctype, do_is() and specializations -


i derived ctype class build own facet in order override virtual function do_is(). purpose make stream extractor ignore space characters (and still tokenize on tabulation character). overriding calls implementation of mother class. compile wchar_t. there no implementation of ctype::do_is() char template value. that's true gcc , vs 2010.

here code ; have uncomment 5th line test between 2 versions.

#include <iostream> #include <locale> #include <sstream>  // #define wide_characters  #ifdef wide_characters typedef wchar_t charactertype; std::basic_string<charactertype> in = l"string1\tstring2 string3"; std::basic_ostream<charactertype>& consoleout = std::wcout; #else typedef char charactertype; std::basic_string<charactertype> in = "string1\tstring2 string3"; std::basic_ostream<charactertype>& consoleout = std::cout; #endif  struct csv_whitespace : std::ctype<charactertype> {     bool do_is(mask m, char_type c) const     {           if ((m & space) && c == ' ')         {             return false; // space not classified whitespace         }          return ctype::do_is(m, c); // leave rest parent class     } };  int main() {     std::basic_string<charactertype> token;      consoleout << "locale modified ctype:\n";     std::basic_istringstream<charactertype> s2(in);     s2.imbue(std::locale(s2.getloc(), new csv_whitespace()));     while (s2 >> token)     {         consoleout << "  " << token << '\n';     } }

thank !

i did following code link give, , work.

#include <iostream> #include <vector> #include <locale> #include <sstream>  // ctype facet declassifies spaces whitespace struct csv_whitespace : std::ctype<char> {     static const mask* make_table()     {         // make copy of "c" locale table         static std::vector<mask> v(classic_table(), classic_table() + table_size);          // space not classified whitespace         v[' '] &= ~space;          return &v[0];     }      csv_whitespace(std::size_t refs = 0) : ctype(make_table(), false, refs) {} };  int main() {     std::string token;      std::string in = "string1\tstring2 string3";      std::cout << "locale modified ctype:\n";     std::istringstream s(in);     s.imbue(std::locale(s.getloc(), new csv_whitespace()));     while (s >> token)     {         std::cout << "  " << token << '\n';     } }

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