Moved the Compile-Time and Run-Time components to separate headers

[SVN r14272]

include/boost/math/common_factor_ct.hpp

@@ -0,0 +1,188 @@
+//  Boost common_factor_ct.hpp header file  ----------------------------------//
+
+//  (C) Copyright Daryle Walker and Stephen Cleary 2001-2002.  Permission to
+//  copy, use, modify, sell and distribute this software is granted provided
+//  this copyright notice appears in all copies.  This software is provided "as
+//  is" without express or implied warranty, and with no claim as to its
+//  suitability for any purpose. 
+
+//  See http://www.boost.org for updates, documentation, and revision history. 
+
+#ifndef BOOST_MATH_COMMON_FACTOR_CT_HPP
+#define BOOST_MATH_COMMON_FACTOR_CT_HPP
+
+#include <boost/math_fwd.hpp>  // self include
+
+#include <boost/config.hpp>  // for BOOST_STATIC_CONSTANT, etc.
+
+
+namespace boost
+{
+namespace math
+{
+
+
+//  Implementation details  --------------------------------------------------//
+
+namespace detail
+{
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+    // Build GCD with Euclid's recursive algorithm
+    template < unsigned long Value1, unsigned long Value2 >
+    struct static_gcd_helper_t
+    {
+    private:
+        BOOST_STATIC_CONSTANT( unsigned long, new_value1 = Value2 );
+        BOOST_STATIC_CONSTANT( unsigned long, new_value2 = Value1 % Value2 );
+
+        #ifndef __BORLANDC__
+        #define BOOST_DETAIL_GCD_HELPER_VAL(Value)  Value
+        #else
+        typedef static_gcd_helper_t  self_type;
+        #define BOOST_DETAIL_GCD_HELPER_VAL(Value)  (self_type:: Value )
+        #endif
+
+        typedef static_gcd_helper_t< BOOST_DETAIL_GCD_HELPER_VAL(new_value1),
+         BOOST_DETAIL_GCD_HELPER_VAL(new_value2) >  next_step_type;
+
+        #undef BOOST_DETAIL_GCD_HELPER_VAL
+
+    public:
+        BOOST_STATIC_CONSTANT( unsigned long, value = next_step_type::value );
+    };
+
+    // Non-recursive case
+    template < unsigned long Value1 >
+    struct static_gcd_helper_t< Value1, 0UL >
+    {
+        BOOST_STATIC_CONSTANT( unsigned long, value = Value1 );
+    };
+#else
+    // Use inner class template workaround from Peter Dimov
+    template < unsigned long Value1 >
+    struct static_gcd_helper2_t
+    {
+        template < unsigned long Value2 >
+        struct helper
+        {
+            BOOST_STATIC_CONSTANT( unsigned long, value
+             = static_gcd_helper2_t<Value2>::helper<Value1 % Value2>::value );
+        };
+
+        template <  >
+        struct helper< 0UL >
+        {
+            BOOST_STATIC_CONSTANT( unsigned long, value = Value1 );
+        };
+    };
+
+    // Special case
+    template <  >
+    struct static_gcd_helper2_t< 0UL >
+    {
+        template < unsigned long Value2 >
+        struct helper
+        {
+            BOOST_STATIC_CONSTANT( unsigned long, value = Value2 );
+        };
+    };
+
+    // Build the GCD from the above template(s)
+    template < unsigned long Value1, unsigned long Value2 >
+    struct static_gcd_helper_t
+    {
+        BOOST_STATIC_CONSTANT( unsigned long, value
+         = static_gcd_helper2_t<Value1>::BOOST_NESTED_TEMPLATE
+         helper<Value2>::value );
+    };
+#endif
+
+#ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
+    // Build the LCM from the GCD
+    template < unsigned long Value1, unsigned long Value2 >
+    struct static_lcm_helper_t
+    {
+        typedef static_gcd_helper_t<Value1, Value2>  gcd_type;
+
+        BOOST_STATIC_CONSTANT( unsigned long, value = Value1 / gcd_type::value
+         * Value2 );
+    };
+
+    // Special case for zero-GCD values
+    template < >
+    struct static_lcm_helper_t< 0UL, 0UL >
+    {
+        BOOST_STATIC_CONSTANT( unsigned long, value = 0UL );
+    };
+#else
+    // Adapt GCD's inner class template workaround for LCM
+    template < unsigned long Value1 >
+    struct static_lcm_helper2_t
+    {
+        template < unsigned long Value2 >
+        struct helper
+        {
+            typedef static_gcd_helper_t<Value1, Value2>  gcd_type;
+
+            BOOST_STATIC_CONSTANT( unsigned long, value = Value1
+             / gcd_type::value * Value2 );
+        };
+
+        template <  >
+        struct helper< 0UL >
+        {
+            BOOST_STATIC_CONSTANT( unsigned long, value = 0UL );
+        };
+    };
+
+    // Special case
+    template <  >
+    struct static_lcm_helper2_t< 0UL >
+    {
+        template < unsigned long Value2 >
+        struct helper
+        {
+            BOOST_STATIC_CONSTANT( unsigned long, value = 0UL );
+        };
+    };
+
+    // Build the LCM from the above template(s)
+    template < unsigned long Value1, unsigned long Value2 >
+    struct static_lcm_helper_t
+    {
+        BOOST_STATIC_CONSTANT( unsigned long, value
+         = static_lcm_helper2_t<Value1>::BOOST_NESTED_TEMPLATE
+         helper<Value2>::value );
+    };
+#endif
+
+}  // namespace detail
+
+
+//  Compile-time greatest common divisor evaluator class declaration  --------//
+
+template < unsigned long Value1, unsigned long Value2 >
+struct static_gcd
+{
+    BOOST_STATIC_CONSTANT( unsigned long, value
+     = (detail::static_gcd_helper_t<Value1, Value2>::value) );
+
+};  // boost::math::static_gcd
+
+
+//  Compile-time least common multiple evaluator class declaration  ----------//
+
+template < unsigned long Value1, unsigned long Value2 >
+struct static_lcm
+{
+    BOOST_STATIC_CONSTANT( unsigned long, value
+     = (detail::static_lcm_helper_t<Value1, Value2>::value) );
+
+};  // boost::math::static_lcm
+
+
+}  // namespace math
+}  // namespace boost
+
+
+#endif  // BOOST_MATH_COMMON_FACTOR_CT_HPP