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extern/stdcxx/4.2.1/examples/manual/num_put.cpp

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+/**************************************************************************
+ *
+ * num_put.cpp - Example program for the num_put facet. 
+ *
+ * $Id: num_put.cpp 550991 2007-06-26 23:58:07Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you 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.
+ *
+ * Copyright 1994-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+
+#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;
+}