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

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+/**************************************************************************
+ *
+ * limits.cpp - Example program of numeric limits class used for 
+ *              representing information about scalar types.
+ *
+ * $Id: limits.cpp 495402 2007-01-11 22:07:07Z 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 1998-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+
+#include <limits>      // for numeric_limits
+#include <iostream>    // for cout
+
+#include <examples.h>
+
+
+std::ostream& operator<< (std::ostream &strm, std::float_denorm_style style)
+{
+    const char* name = "(unknown)";
+
+    switch (style) {
+    case std::denorm_absent: name = "std::denorm_absent"; break;
+    case std::denorm_indeterminate: name = "std::denorm_indeterminate"; break;
+    case std::denorm_present: name = "std::denorm_present"; break;
+    }
+
+    return strm << name;
+}
+
+
+template <class T>
+void print_limits (std::ostream &strm, const char *tname, T)
+{
+#define PRINT_MEMBER(type, member)                     \
+    strm << "    static " << type << " " #member " = "            \
+         << std::numeric_limits<T>::member << ";\n"
+
+    strm << "struct std::numeric_limits<" << tname << "> {\n";
+
+    PRINT_MEMBER ("const bool", is_specialized);
+
+    PRINT_MEMBER (tname, min ());
+    PRINT_MEMBER (tname, max ());
+
+    PRINT_MEMBER ("const int", digits);
+    PRINT_MEMBER ("const int", digits10);
+
+    PRINT_MEMBER ("const bool", is_signed);
+    PRINT_MEMBER ("const bool", is_integer);
+    PRINT_MEMBER ("const bool", is_exact);
+    PRINT_MEMBER ("const int", radix);
+
+    PRINT_MEMBER (tname, epsilon ());
+    PRINT_MEMBER ("int", round_error ());
+
+    PRINT_MEMBER ("const int", min_exponent);
+    PRINT_MEMBER ("const int", min_exponent10);
+    PRINT_MEMBER ("const int", max_exponent);
+    PRINT_MEMBER ("const int", max_exponent10);
+
+    PRINT_MEMBER ("const bool", has_infinity);
+    PRINT_MEMBER ("const bool", has_quiet_NaN);
+    PRINT_MEMBER ("const bool", has_signaling_NaN);
+    PRINT_MEMBER ("const std::float_denorm_style", has_denorm);
+
+    PRINT_MEMBER ("const bool", has_denorm_loss);
+
+    PRINT_MEMBER (tname, infinity ());
+    PRINT_MEMBER (tname, quiet_NaN ());
+    PRINT_MEMBER (tname, signaling_NaN ());
+    PRINT_MEMBER (tname, denorm_min ());
+
+    PRINT_MEMBER ("const bool", is_iec559);
+    PRINT_MEMBER ("const bool", is_bounded);
+    PRINT_MEMBER ("const bool", is_modulo);
+
+    PRINT_MEMBER ("const bool", traps);
+    PRINT_MEMBER ("const bool", tinyness_before);
+
+    PRINT_MEMBER ("const int", round_style);
+
+    strm << "};\n";
+}
+
+
+int main ()
+{
+#define PRINT_LIMITS(T) print_limits (std::cout, #T, T ())
+
+    // print bool values as "false" and "true"
+    std::cout.setf (std::cout.boolalpha);
+
+    // print the numeric limits for an integer type
+    PRINT_LIMITS (int);
+
+    std::cout << '\n';
+
+    // print the numeric limits for a floating point type
+    PRINT_LIMITS (double);
+
+    return 0;
+}