98 lines
3.0 KiB
Plaintext
98 lines
3.0 KiB
Plaintext
|
// Boost common_factor_ct.hpp header file ----------------------------------//
|
||
|
|
|
||
|
|
// (C) Copyright Daryle Walker and Stephen Cleary 2001-2002.
|
||
|
|
// 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 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.
|
||
|
|
#include <boost/mpl/integral_c.hpp>
|
||
|
|
|
||
|
|
namespace boost
|
||
|
|
{
|
||
|
|
namespace math
|
||
|
|
{
|
||
|
|
|
||
|
|
// Implementation details --------------------------------------------------//
|
||
|
|
|
||
|
|
namespace detail
|
||
|
|
{
|
||
|
|
// Build GCD with Euclid's recursive algorithm
|
||
|
|
template < static_gcd_type Value1, static_gcd_type Value2 >
|
||
|
|
struct static_gcd_helper_t
|
||
|
|
{
|
||
|
|
private:
|
||
|
|
BOOST_STATIC_CONSTANT( static_gcd_type, new_value1 = Value2 );
|
||
|
|
BOOST_STATIC_CONSTANT( static_gcd_type, new_value2 = Value1 % Value2 );
|
||
|
|
|
||
|
|
#ifndef __BORLANDC__
|
||
|
|
#define BOOST_DETAIL_GCD_HELPER_VAL(Value) static_cast<static_gcd_type>(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( static_gcd_type, value = next_step_type::value );
|
||
|
|
};
|
||
|
|
|
||
|
|
// Non-recursive case
|
||
|
|
template < static_gcd_type Value1 >
|
||
|
|
struct static_gcd_helper_t< Value1, 0UL >
|
||
|
|
{
|
||
|
|
BOOST_STATIC_CONSTANT( static_gcd_type, value = Value1 );
|
||
|
|
};
|
||
|
|
|
||
|
|
// Build the LCM from the GCD
|
||
|
|
template < static_gcd_type Value1, static_gcd_type Value2 >
|
||
|
|
struct static_lcm_helper_t
|
||
|
|
{
|
||
|
|
typedef static_gcd_helper_t<Value1, Value2> gcd_type;
|
||
|
|
|
||
|
|
BOOST_STATIC_CONSTANT( static_gcd_type, value = Value1 / gcd_type::value
|
||
|
|
* Value2 );
|
||
|
|
};
|
||
|
|
|
||
|
|
// Special case for zero-GCD values
|
||
|
|
template < >
|
||
|
|
struct static_lcm_helper_t< 0UL, 0UL >
|
||
|
|
{
|
||
|
|
BOOST_STATIC_CONSTANT( static_gcd_type, value = 0UL );
|
||
|
|
};
|
||
|
|
|
||
|
|
} // namespace detail
|
||
|
|
|
||
|
|
|
||
|
|
// Compile-time greatest common divisor evaluator class declaration --------//
|
||
|
|
|
||
|
|
template < static_gcd_type Value1, static_gcd_type Value2 >
|
||
|
|
struct static_gcd : public mpl::integral_c<static_gcd_type, (detail::static_gcd_helper_t<Value1, Value2>::value) >
|
||
|
|
{
|
||
|
|
}; // boost::math::static_gcd
|
||
|
|
|
||
|
|
|
||
|
|
// Compile-time least common multiple evaluator class declaration ----------//
|
||
|
|
|
||
|
|
template < static_gcd_type Value1, static_gcd_type Value2 >
|
||
|
|
struct static_lcm : public mpl::integral_c<static_gcd_type, (detail::static_lcm_helper_t<Value1, Value2>::value) >
|
||
|
|
{
|
||
|
|
}; // boost::math::static_lcm
|
||
|
|
|
||
|
|
|
||
|
|
} // namespace math
|
||
|
|
} // namespace boost
|
||
|
|
|
||
|
|
|
||
|
|
#endif // BOOST_MATH_COMMON_FACTOR_CT_HPP
|