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

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+/**************************************************************************
+ *
+ * numget.cpp - Example program for the numget facet. 
+ *
+ * $Id: num_get.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 <sstream>    // for istringstream
+#include <string>     // for string
+
+
+int main ()
+{
+    typedef std::istreambuf_iterator<char, std::char_traits<char> > Iter;
+  
+    std::ios::iostate state;
+    Iter              end;
+
+    bool        bval  = false;
+    long        lval  = 0L;
+    long double ldval = 0.0;
+
+    const std::locale loc;
+
+    // Get a num_get facet
+    const std::num_get<char, Iter> &ng =
+        std::use_facet<std::num_get<char, Iter> >(loc);
+
+#ifndef _RWSTD_NO_BOOL
+    {
+        // Build an istringstream from the buffer and construct
+        // beginning and ending iterators on it.
+        std::istringstream ins ("true");
+        Iter begin (ins);
+
+        // Set stream flags to recognize boolalpha input.
+        ins.setf (std::ios::boolalpha);
+
+        // Get the boolean value from the stream.
+        ng.get (begin, end, ins, state, bval);
+    }
+#endif
+
+    std::cout << bval << std::endl;
+
+    {
+        // Get the date
+        std::istringstream ins ("2422235");
+        Iter begin (ins);
+        ng.get (begin, end, ins, state, lval);
+    }
+
+    std::cout << lval << std::endl;
+
+    {
+        // Get the weekday
+        std::istringstream ins ("32324342.98908");
+        Iter begin (ins);
+        ng.get (begin, end, ins, state, ldval);
+    }
+
+    std::cout.setf (std::ios::fixed, std::ios::floatfield);
+    std::cout << ldval << std::endl;
+
+    return 0;
+}