| /************************************************************************** |
| * |
| * num_put.cpp - Example program for the num_put facet. |
| * |
| * $Id: //stdlib/dev/examples/stdlib/manual/num_put.cpp#5 $ |
| * |
| *************************************************************************** |
| * |
| * Copyright (c) 1994-2005 Quovadx, Inc., acting through its Rogue Wave |
| * Software division. Licensed under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance with the |
| * License. You may obtain a copy of the License at |
| * http://www.apache.org/licenses/LICENSE-2.0. Unless required by |
| * applicable law or agreed to in writing, software distributed under |
| * the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR |
| * CONDITIONS OF ANY KIND, either express or implied. See the License |
| * for the specific language governing permissions and limitations under |
| * the License. |
| * |
| **************************************************************************/ |
| |
| #include <iostream> // for cout, endl |
| #include <iterator> // for ostreambuf_iterator |
| #include <locale> // for time_put |
| |
| #include <examples.h> |
| |
| |
| // custom numeric punctuation facet |
| struct Punct: std::numpunct<char> |
| { |
| char do_decimal_point () const { |
| return ';'; |
| } |
| |
| string_type do_truename () const { |
| return "numeric formatting"; |
| } |
| |
| char do_thousands_sep () const { |
| return ':'; |
| } |
| |
| std::string do_grouping () const { |
| return "\1\2\3"; |
| } |
| }; |
| |
| |
| int main () |
| { |
| // construct a custom punctuation facet |
| std::numpunct<char> *punct = new Punct; |
| |
| // construct a locale containing the custom facet |
| const std::locale loc (std::cout.getloc (), punct); |
| |
| // imbue combined locale in cout |
| std::cout.imbue (loc); |
| |
| // retrieve the standard numeric formatting facet |
| const std::num_put<char> &nput = |
| std::use_facet<std::num_put<char> >(std::cout.getloc ()); |
| |
| // obtain a stream buffer iterator operating on cout's buffer |
| std::ostreambuf_iterator<char> it = std::cout.rdbuf (); |
| |
| // write out bool values as strings |
| std::cout.setf (std::ios::boolalpha); |
| *nput.put (it, std::cout, ' ', true) = '\n'; |
| |
| // set the field width and justification for the next operation |
| std::cout.width (18); |
| std::cout.setf (std::ios::fixed | std::ios::right); |
| |
| const double Pi = 3.14159265358979323846; |
| |
| // truncate Pi to an integer and write it out, padded on the left with periods |
| *nput.put (it, std::cout, '.', long (Pi)) = '\n'; |
| |
| // write out a number in hex notation using capital letters |
| std::cerr.width (13); |
| std::cerr.setf (std::ios::right | std::ios::uppercase); |
| std::cerr.setf (std::ios::hex, std::ios::basefield); |
| *nput.put (it, std::cerr, ' ', 3735928559UL) = '\n'; |
| |
| std::cout.width (18); |
| std::cout.setf (std::ios::internal, std::ios::adjustfield); |
| std::cout.setf (std::ios::showpos); |
| |
| // write Pi out padded after the sign with spaces |
| *nput.put (it, std::cout, ' ', Pi) = '\n'; |
| |
| // write Pi out again, multiplied by a large number (to see grouping) |
| *nput.put (it, std::cout, ' ', Pi * 1000000) = '\n'; |
| |
| // and again, in scientific notation |
| std::cout.precision (11); |
| std::cout.setf (std::ios::scientific, std::ios::floatfield); |
| *nput.put (it, std::cout, ' ', Pi * 1000000) = '\n'; |
| |
| return 0; |
| } |