Added thirdparty: boost library

thirdparty/include/boost/spirit/home/x3/numeric/real_policies.hpp

@@ -0,0 +1,169 @@
+/*=============================================================================
+    Copyright (c) 2001-2014 Joel de Guzman
+    Copyright (c) 2001-2011 Hartmut Kaiser
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(BOOST_SPIRIT_X3_REAL_POLICIES_APRIL_17_2006_1158PM)
+#define BOOST_SPIRIT_X3_REAL_POLICIES_APRIL_17_2006_1158PM
+
+#include <boost/spirit/home/x3/string/detail/string_parse.hpp>
+#include <boost/spirit/home/x3/support/numeric_utils/extract_int.hpp>
+
+namespace boost { namespace spirit { namespace x3
+{
+    ///////////////////////////////////////////////////////////////////////////
+    //  Default (unsigned) real number policies
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename T>
+    struct ureal_policies
+    {
+        // trailing dot policy suggested by Gustavo Guerra
+        static bool const allow_leading_dot = true;
+        static bool const allow_trailing_dot = true;
+        static bool const expect_dot = false;
+
+        template <typename Iterator>
+        static bool
+        parse_sign(Iterator& /*first*/, Iterator const& /*last*/)
+        {
+            return false;
+        }
+
+        template <typename Iterator, typename Attribute>
+        static bool
+        parse_n(Iterator& first, Iterator const& last, Attribute& attr_)
+        {
+            return extract_uint<T, 10, 1, -1>::call(first, last, attr_);
+        }
+
+        template <typename Iterator>
+        static bool
+        parse_dot(Iterator& first, Iterator const& last)
+        {
+            if (first == last || *first != '.')
+                return false;
+            ++first;
+            return true;
+        }
+
+        template <typename Iterator, typename Attribute>
+        static bool
+        parse_frac_n(Iterator& first, Iterator const& last, Attribute& attr_)
+        {
+            return extract_uint<T, 10, 1, -1, true>::call(first, last, attr_);
+        }
+
+        template <typename Iterator>
+        static bool
+        parse_exp(Iterator& first, Iterator const& last)
+        {
+            if (first == last || (*first != 'e' && *first != 'E'))
+                return false;
+            ++first;
+            return true;
+        }
+
+        template <typename Iterator>
+        static bool
+        parse_exp_n(Iterator& first, Iterator const& last, int& attr_)
+        {
+            return extract_int<int, 10, 1, -1>::call(first, last, attr_);
+        }
+
+        ///////////////////////////////////////////////////////////////////////
+        //  The parse_nan() and parse_inf() functions get called whenever
+        //  a number to parse does not start with a digit (after having
+        //  successfully parsed an optional sign).
+        //
+        //  The functions should return true if a Nan or Inf has been found. In
+        //  this case the attr should be set to the matched value (NaN or
+        //  Inf). The optional sign will be automatically applied afterwards.
+        //
+        //  The default implementation below recognizes representations of NaN
+        //  and Inf as mandated by the C99 Standard and as proposed for
+        //  inclusion into the C++0x Standard: nan, nan(...), inf and infinity
+        //  (the matching is performed case-insensitively).
+        ///////////////////////////////////////////////////////////////////////
+        template <typename Iterator, typename Attribute>
+        static bool
+        parse_nan(Iterator& first, Iterator const& last, Attribute& attr_)
+        {
+            if (first == last)
+                return false;   // end of input reached
+
+            if (*first != 'n' && *first != 'N')
+                return false;   // not "nan"
+
+            // nan[(...)] ?
+            if (detail::string_parse("nan", "NAN", first, last, unused))
+            {
+                if (first != last && *first == '(')
+                {
+                    // skip trailing (...) part
+                    Iterator i = first;
+
+                    while (++i != last && *i != ')')
+                        ;
+                    if (i == last)
+                        return false;     // no trailing ')' found, give up
+
+                    first = ++i;
+                }
+                attr_ = std::numeric_limits<T>::quiet_NaN();
+                return true;
+            }
+            return false;
+        }
+
+        template <typename Iterator, typename Attribute>
+        static bool
+        parse_inf(Iterator& first, Iterator const& last, Attribute& attr_)
+        {
+            if (first == last)
+                return false;   // end of input reached
+
+            if (*first != 'i' && *first != 'I')
+                return false;   // not "inf"
+
+            // inf or infinity ?
+            if (detail::string_parse("inf", "INF", first, last, unused))
+            {
+                // skip allowed 'inity' part of infinity
+                detail::string_parse("inity", "INITY", first, last, unused);
+                attr_ = std::numeric_limits<T>::infinity();
+                return true;
+            }
+            return false;
+        }
+    };
+
+    ///////////////////////////////////////////////////////////////////////////
+    //  Default (signed) real number policies
+    ///////////////////////////////////////////////////////////////////////////
+    template <typename T>
+    struct real_policies : ureal_policies<T>
+    {
+        template <typename Iterator>
+        static bool
+        parse_sign(Iterator& first, Iterator const& last)
+        {
+            return extract_sign(first, last);
+        }
+    };
+
+    template <typename T>
+    struct strict_ureal_policies : ureal_policies<T>
+    {
+        static bool const expect_dot = true;
+    };
+
+    template <typename T>
+    struct strict_real_policies : real_policies<T>
+    {
+        static bool const expect_dot = true;
+    };
+}}}
+
+#endif