comparison DEPENDENCIES/generic/include/boost/ratio/detail/mpl/sign.hpp @ 16:2665513ce2d3

Add boost headers

+////////////////////////////////////////////////////////////////////
+//
+// Copyright Vicente J. Botet Escriba 2010
+//
+// 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)
+//
+// See http://www.boost.org/libs/mpl for documentation.
+//
+////////////////////////////////////////////////////////////////////
+#ifndef BOOST_MPL_SIGN_HPP_INCLUDED
+#define BOOST_MPL_SIGN_HPP_INCLUDED
+
+#include <boost/mpl/integral_c.hpp>
+#include <boost/mpl/aux_/na_spec.hpp>
+#include <boost/mpl/aux_/lambda_support.hpp>
+#include <boost/mpl/aux_/config/eti.hpp>
+#include <boost/mpl/aux_/config/integral.hpp>
+#include <boost/mpl/aux_/config/static_constant.hpp>
+
+#if    !defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2) \
+    && !defined(BOOST_MPL_PREPROCESSING_MODE) \
+    && ( defined(BOOST_MSVC) \
+        || BOOST_WORKAROUND(__EDG_VERSION__, <= 238) \
+        )
+
+#   define BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2
+
+#endif
+
+namespace boost { namespace mpl {
+
+template< typename Tag > struct sign_impl;
+
+template< typename T > struct sign_tag
+{
+    typedef typename T::tag type;
+};
+
+template<
+      typename BOOST_MPL_AUX_NA_PARAM(N)
+    >
+struct sign
+    : sign_impl<
+          typename sign_tag<N>::type
+        >::template apply<N>::type
+{
+    BOOST_MPL_AUX_LAMBDA_SUPPORT(1, sign, (N))
+};
+
+BOOST_MPL_AUX_NA_SPEC(1, sign)
+
+template<
+      typename T
+    , T n1
+    >
+struct sign_c
+    : sign<integral_c<T,n1> >
+{
+};
+
+#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2)
+namespace aux {
+template< typename T, T n > struct sign_wknd
+{
+    BOOST_STATIC_CONSTANT(T, value = (n == 0 ? 0 : (n < 0 ? -1 : 1)));
+    typedef integral_c<T,value> type;
+};
+}
+#endif
+
+template<>
+struct sign_impl<integral_c_tag>
+{
+#if defined(BOOST_MPL_CFG_NO_NESTED_VALUE_ARITHMETIC_2)
+    template< typename N > struct apply
+        : aux::sign_wknd< typename N::value_type, N::value >
+#else
+    template< typename N > struct apply
+        : integral_c< typename N::value_type, (N::value == 0 ? 0 : (N::value < 0 ? -1 : 1)) >
+#endif    
+    {
+    };
+};
+
+}}
+
+#endif // BOOST_MPL_SIGN_HPP_INCLUDED