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Implement ratio_gcd (which is, yes, used by Chrono)

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This commit is contained in:
Peter Dimov 2023-10-13 06:48:23 +03:00
parent 00a69ca14d
commit 4d35c901a9
3 changed files with 70 additions and 7 deletions
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11
include/boost/ratio/ratio.hpp
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@ -33,20 +33,17 @@ time2_demo contained this comment:
#define BOOST_RATIO_RATIO_HPP #define BOOST_RATIO_RATIO_HPP
#include <boost/ratio/ratio_fwd.hpp> #include <boost/ratio/ratio_fwd.hpp>
#include <boost/ratio/detail/gcd_lcm.hpp>
namespace boost namespace boost
{ {
/* template <class R1, class R2> struct ratio_gcd: ratio<
template <class R1, class R2> ratio_detail::gcd<R1::num, R2::num>::value,
struct ratio_gcd : ratio_detail::lcm<R1::den, R2::den>::value>::type
ratio<mpl::gcd_c<boost::intmax_t, R1::num, R2::num>::value,
mpl::lcm_c<boost::intmax_t, R1::den, R2::den>::value>::type
{ {
}; };
*/
} // namespace boost } // namespace boost
#endif // BOOST_RATIO_RATIO_HPP #endif // BOOST_RATIO_RATIO_HPP

1
test/Jamfile.v2
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@ -34,6 +34,7 @@ compile ratio_arithmetic/ratio_add_pass.cpp ;
compile ratio_arithmetic/ratio_subtract_pass.cpp ; compile ratio_arithmetic/ratio_subtract_pass.cpp ;
compile ratio_arithmetic/ratio_multiply_pass.cpp ; compile ratio_arithmetic/ratio_multiply_pass.cpp ;
compile ratio_arithmetic/ratio_divide_pass.cpp ; compile ratio_arithmetic/ratio_divide_pass.cpp ;
compile ratio_arithmetic/ratio_gcd_pass.cpp ;
compile-fail ratio_arithmetic/ratio_add_fail.cpp ; compile-fail ratio_arithmetic/ratio_add_fail.cpp ;
compile-fail ratio_arithmetic/ratio_add_2_fail.cpp ; compile-fail ratio_arithmetic/ratio_add_2_fail.cpp ;
#compile-fail ratio_arithmetic/ratio_add_3_fail.cpp ; #compile-fail ratio_arithmetic/ratio_add_3_fail.cpp ;

65
test/ratio_arithmetic/ratio_gcd_pass.cpp Normal file
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@ -0,0 +1,65 @@
// Copyright 2023 Peter Dimov
// Distributed under the Boost Software License, Version 1.0.
// https://www.boost.org/LICENSE_1_0.txt
#include <boost/ratio/ratio.hpp>
#define STATIC_ASSERT(...) static_assert(__VA_ARGS__, #__VA_ARGS__)
void test()
{
{
typedef boost::ratio<1, 1> R1;
typedef boost::ratio<1, 1> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 1);
}
{
typedef boost::ratio<1, 2> R1;
typedef boost::ratio<1, 1> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 2);
}
{
typedef boost::ratio<-1, 2> R1;
typedef boost::ratio<1, 1> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 2);
}
{
typedef boost::ratio<1, -2> R1;
typedef boost::ratio<1, 1> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 2);
}
{
typedef boost::ratio<1, 2> R1;
typedef boost::ratio<-1, 1> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 2);
}
{
typedef boost::ratio<1, 2> R1;
typedef boost::ratio<1, -1> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 2);
}
{
typedef boost::ratio<1, 2> R1;
typedef boost::ratio<1, 3> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 6);
}
{
typedef boost::ratio<7, 13> R1;
typedef boost::ratio<11, 13> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 1 && R::den == 13);
}
{
typedef boost::ratio<21, 55> R1;
typedef boost::ratio<14, 25> R2;
typedef boost::ratio_gcd<R1, R2> R;
STATIC_ASSERT(R::num == 7 && R::den == 275);
}
}