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98 lines
2.9 KiB
C++
98 lines
2.9 KiB
C++
// Boost common_factor_ct.hpp header file ----------------------------------//
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// (C) Copyright Daryle Walker and Stephen Cleary 2001-2002.
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// Distributed under the Boost Software License, Version 1.0. (See
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// accompanying file LICENSE_1_0.txt or copy at
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// http://www.boost.org/LICENSE_1_0.txt)
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// See http://www.boost.org for updates, documentation, and revision history.
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#ifndef BOOST_MATH_COMMON_FACTOR_CT_HPP
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#define BOOST_MATH_COMMON_FACTOR_CT_HPP
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#include <boost/math_fwd.hpp> // self include
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#include <boost/config.hpp> // for BOOST_STATIC_CONSTANT, etc.
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#include <boost/mpl/integral_c.hpp>
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namespace boost
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{
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namespace math
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{
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// Implementation details --------------------------------------------------//
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namespace detail
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{
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// Build GCD with Euclid's recursive algorithm
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template < static_gcd_type Value1, static_gcd_type Value2 >
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struct static_gcd_helper_t
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{
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private:
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BOOST_STATIC_CONSTANT( static_gcd_type, new_value1 = Value2 );
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BOOST_STATIC_CONSTANT( static_gcd_type, new_value2 = Value1 % Value2 );
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#ifndef __BORLANDC__
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#define BOOST_DETAIL_GCD_HELPER_VAL(Value) static_cast<static_gcd_type>(Value)
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#else
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typedef static_gcd_helper_t self_type;
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#define BOOST_DETAIL_GCD_HELPER_VAL(Value) (self_type:: Value )
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#endif
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typedef static_gcd_helper_t< BOOST_DETAIL_GCD_HELPER_VAL(new_value1),
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BOOST_DETAIL_GCD_HELPER_VAL(new_value2) > next_step_type;
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#undef BOOST_DETAIL_GCD_HELPER_VAL
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public:
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BOOST_STATIC_CONSTANT( static_gcd_type, value = next_step_type::value );
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};
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// Non-recursive case
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template < static_gcd_type Value1 >
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struct static_gcd_helper_t< Value1, 0UL >
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{
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BOOST_STATIC_CONSTANT( static_gcd_type, value = Value1 );
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};
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// Build the LCM from the GCD
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template < static_gcd_type Value1, static_gcd_type Value2 >
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struct static_lcm_helper_t
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{
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typedef static_gcd_helper_t<Value1, Value2> gcd_type;
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BOOST_STATIC_CONSTANT( static_gcd_type, value = Value1 / gcd_type::value
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* Value2 );
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};
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// Special case for zero-GCD values
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template < >
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struct static_lcm_helper_t< 0UL, 0UL >
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{
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BOOST_STATIC_CONSTANT( static_gcd_type, value = 0UL );
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};
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} // namespace detail
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// Compile-time greatest common divisor evaluator class declaration --------//
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template < static_gcd_type Value1, static_gcd_type Value2 >
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struct static_gcd : public mpl::integral_c<static_gcd_type, (detail::static_gcd_helper_t<Value1, Value2>::value) >
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{
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}; // boost::math::static_gcd
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// Compile-time least common multiple evaluator class declaration ----------//
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template < static_gcd_type Value1, static_gcd_type Value2 >
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struct static_lcm : public mpl::integral_c<static_gcd_type, (detail::static_lcm_helper_t<Value1, Value2>::value) >
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{
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}; // boost::math::static_lcm
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} // namespace math
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} // namespace boost
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#endif // BOOST_MATH_COMMON_FACTOR_CT_HPP
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