1 ///////////////////////////////////////////////////////////////
2 // Copyright 2011 John Maddock. Distributed under the Boost
3 // Software License, Version 1.0. (See accompanying file
4 // LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt
6 #ifndef BOOST_MATH_RATIONAL_ADAPTER_HPP
7 #define BOOST_MATH_RATIONAL_ADAPTER_HPP
12 #include <boost/cstdint.hpp>
13 #include <boost/functional/hash_fwd.hpp>
14 #include <boost/multiprecision/number.hpp>
17 #pragma warning(disable : 4512 4127)
19 #include <boost/rational.hpp>
25 namespace multiprecision {
28 template <class IntBackend>
29 struct rational_adaptor
31 typedef number<IntBackend> integer_type;
32 typedef boost::rational<integer_type> rational_type;
34 typedef typename IntBackend::signed_types signed_types;
35 typedef typename IntBackend::unsigned_types unsigned_types;
36 typedef typename IntBackend::float_types float_types;
38 rational_adaptor() BOOST_MP_NOEXCEPT_IF(noexcept(rational_type())) {}
39 rational_adaptor(const rational_adaptor& o) BOOST_MP_NOEXCEPT_IF(noexcept(std::declval<rational_type&>() = std::declval<const rational_type&>()))
43 rational_adaptor(const IntBackend& o) BOOST_MP_NOEXCEPT_IF(noexcept(rational_type(std::declval<const IntBackend&>()))) : m_value(o) {}
46 rational_adaptor(const U& u, typename enable_if_c<is_convertible<U, IntBackend>::value>::type* = 0)
47 : m_value(static_cast<integer_type>(u)) {}
49 explicit rational_adaptor(const U& u,
51 boost::multiprecision::detail::is_explicitly_convertible<U, IntBackend>::value && !is_convertible<U, IntBackend>::value>::type* = 0)
52 : m_value(IntBackend(u)) {}
54 typename enable_if_c<(boost::multiprecision::detail::is_explicitly_convertible<U, IntBackend>::value && !is_arithmetic<U>::value), rational_adaptor&>::type operator=(const U& u)
56 m_value = IntBackend(u);
60 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
61 rational_adaptor(rational_adaptor&& o) BOOST_MP_NOEXCEPT_IF(noexcept(rational_type(std::declval<rational_type>()))) : m_value(static_cast<rational_type&&>(o.m_value))
63 rational_adaptor(IntBackend&& o) BOOST_MP_NOEXCEPT_IF(noexcept(rational_type(std::declval<IntBackend>()))) : m_value(static_cast<IntBackend&&>(o)) {}
64 rational_adaptor& operator=(rational_adaptor&& o) BOOST_MP_NOEXCEPT_IF(noexcept(std::declval<rational_type&>() = std::declval<rational_type>()))
66 m_value = static_cast<rational_type&&>(o.m_value);
70 rational_adaptor& operator=(const rational_adaptor& o)
75 rational_adaptor& operator=(const IntBackend& o)
81 typename enable_if<is_integral<Int>, rational_adaptor&>::type operator=(Int i)
86 template <class Float>
87 typename enable_if<is_floating_point<Float>, rational_adaptor&>::type operator=(Float i)
90 Float f = std::frexp(i, &e);
91 f = std::ldexp(f, std::numeric_limits<Float>::digits);
92 e -= std::numeric_limits<Float>::digits;
94 integer_type denom(1u);
103 m_value.assign(num, denom);
106 rational_adaptor& operator=(const char* s)
109 multiprecision::number<IntBackend> v1, v2;
111 bool have_hex = false;
112 const char* p = s; // saved for later
114 while ((0 != (c = *s)) && (c == 'x' || c == 'X' || c == '-' || c == '+' || (c >= '0' && c <= '9') || (have_hex && (c >= 'a' && c <= 'f')) || (have_hex && (c >= 'A' && c <= 'F'))))
116 if (c == 'x' || c == 'X')
126 while ((0 != (c = *s)) && (c == 'x' || c == 'X' || c == '-' || c == '+' || (c >= '0' && c <= '9') || (have_hex && (c >= 'a' && c <= 'f')) || (have_hex && (c >= 'A' && c <= 'F'))))
128 if (c == 'x' || c == 'X')
139 BOOST_THROW_EXCEPTION(std::runtime_error(std::string("Could not parse the string \"") + p + std::string("\" as a valid rational number.")));
141 data().assign(v1, v2);
144 void swap(rational_adaptor& o)
146 std::swap(m_value, o.m_value);
148 std::string str(std::streamsize digits, std::ios_base::fmtflags f) const
151 // We format the string ourselves so we can match what GMP's mpq type does:
153 std::string result = data().numerator().str(digits, f);
154 if (data().denominator() != 1)
156 result.append(1, '/');
157 result.append(data().denominator().str(digits, f));
165 int compare(const rational_adaptor& o) const
167 return m_value > o.m_value ? 1 : (m_value < o.m_value ? -1 : 0);
169 template <class Arithmatic>
170 typename enable_if_c<is_arithmetic<Arithmatic>::value && !is_floating_point<Arithmatic>::value, int>::type compare(Arithmatic i) const
172 return m_value > i ? 1 : (m_value < i ? -1 : 0);
174 template <class Arithmatic>
175 typename enable_if_c<is_floating_point<Arithmatic>::value, int>::type compare(Arithmatic i) const
179 return this->compare(r);
181 rational_type& data() { return m_value; }
182 const rational_type& data() const { return m_value; }
184 template <class Archive>
185 void serialize(Archive& ar, const mpl::true_&)
188 integer_type n(m_value.numerator()), d(m_value.denominator());
189 ar& boost::make_nvp("numerator", n);
190 ar& boost::make_nvp("denominator", d);
192 template <class Archive>
193 void serialize(Archive& ar, const mpl::false_&)
197 ar& boost::make_nvp("numerator", n);
198 ar& boost::make_nvp("denominator", d);
199 m_value.assign(n, d);
201 template <class Archive>
202 void serialize(Archive& ar, const unsigned int /*version*/)
204 typedef typename Archive::is_saving tag;
205 serialize(ar, tag());
209 rational_type m_value;
212 template <class IntBackend>
213 inline void eval_add(rational_adaptor<IntBackend>& result, const rational_adaptor<IntBackend>& o)
215 result.data() += o.data();
217 template <class IntBackend>
218 inline void eval_subtract(rational_adaptor<IntBackend>& result, const rational_adaptor<IntBackend>& o)
220 result.data() -= o.data();
222 template <class IntBackend>
223 inline void eval_multiply(rational_adaptor<IntBackend>& result, const rational_adaptor<IntBackend>& o)
225 result.data() *= o.data();
227 template <class IntBackend>
228 inline void eval_divide(rational_adaptor<IntBackend>& result, const rational_adaptor<IntBackend>& o)
230 using default_ops::eval_is_zero;
233 BOOST_THROW_EXCEPTION(std::overflow_error("Divide by zero."));
235 result.data() /= o.data();
238 template <class R, class IntBackend>
239 inline typename enable_if_c<number_category<R>::value == number_kind_floating_point>::type eval_convert_to(R* result, const rational_adaptor<IntBackend>& backend)
242 // The generic conversion is as good as anything we can write here:
244 ::boost::multiprecision::detail::generic_convert_rational_to_float(*result, backend);
247 template <class R, class IntBackend>
248 inline typename enable_if_c<(number_category<R>::value != number_kind_integer) && (number_category<R>::value != number_kind_floating_point)>::type eval_convert_to(R* result, const rational_adaptor<IntBackend>& backend)
250 typedef typename component_type<number<rational_adaptor<IntBackend> > >::type comp_t;
251 comp_t num(backend.data().numerator());
252 comp_t denom(backend.data().denominator());
253 *result = num.template convert_to<R>();
254 *result /= denom.template convert_to<R>();
257 template <class R, class IntBackend>
258 inline typename enable_if_c<number_category<R>::value == number_kind_integer>::type eval_convert_to(R* result, const rational_adaptor<IntBackend>& backend)
260 typedef typename component_type<number<rational_adaptor<IntBackend> > >::type comp_t;
261 comp_t t = backend.data().numerator();
262 t /= backend.data().denominator();
263 *result = t.template convert_to<R>();
266 template <class IntBackend>
267 inline bool eval_is_zero(const rational_adaptor<IntBackend>& val)
269 using default_ops::eval_is_zero;
270 return eval_is_zero(val.data().numerator().backend());
272 template <class IntBackend>
273 inline int eval_get_sign(const rational_adaptor<IntBackend>& val)
275 using default_ops::eval_get_sign;
276 return eval_get_sign(val.data().numerator().backend());
279 template <class IntBackend, class V>
280 inline void assign_components(rational_adaptor<IntBackend>& result, const V& v1, const V& v2)
282 result.data().assign(v1, v2);
285 template <class IntBackend>
286 inline std::size_t hash_value(const rational_adaptor<IntBackend>& val)
288 std::size_t result = hash_value(val.data().numerator());
289 boost::hash_combine(result, val.data().denominator());
293 } // namespace backends
295 template <class IntBackend>
296 struct expression_template_default<backends::rational_adaptor<IntBackend> > : public expression_template_default<IntBackend>
299 template <class IntBackend>
300 struct number_category<backends::rational_adaptor<IntBackend> > : public mpl::int_<number_kind_rational>
303 using boost::multiprecision::backends::rational_adaptor;
305 template <class Backend, expression_template_option ExpressionTemplates>
306 struct component_type<number<backends::rational_adaptor<Backend>, ExpressionTemplates> >
308 typedef number<Backend, ExpressionTemplates> type;
311 template <class IntBackend, expression_template_option ET>
312 inline number<IntBackend, ET> numerator(const number<rational_adaptor<IntBackend>, ET>& val)
314 return val.backend().data().numerator();
316 template <class IntBackend, expression_template_option ET>
317 inline number<IntBackend, ET> denominator(const number<rational_adaptor<IntBackend>, ET>& val)
319 return val.backend().data().denominator();
322 #ifdef BOOST_NO_SFINAE_EXPR
326 template <class U, class IntBackend>
327 struct is_explicitly_convertible<U, rational_adaptor<IntBackend> > : public is_explicitly_convertible<U, IntBackend>
330 } // namespace detail
334 }} // namespace boost::multiprecision
338 template <class IntBackend, boost::multiprecision::expression_template_option ExpressionTemplates>
339 class numeric_limits<boost::multiprecision::number<boost::multiprecision::rational_adaptor<IntBackend>, ExpressionTemplates> > : public std::numeric_limits<boost::multiprecision::number<IntBackend, ExpressionTemplates> >
341 typedef std::numeric_limits<boost::multiprecision::number<IntBackend> > base_type;
342 typedef boost::multiprecision::number<boost::multiprecision::rational_adaptor<IntBackend> > number_type;
345 BOOST_STATIC_CONSTEXPR bool is_integer = false;
346 BOOST_STATIC_CONSTEXPR bool is_exact = true;
347 BOOST_STATIC_CONSTEXPR number_type(min)() { return (base_type::min)(); }
348 BOOST_STATIC_CONSTEXPR number_type(max)() { return (base_type::max)(); }
349 BOOST_STATIC_CONSTEXPR number_type lowest() { return -(max)(); }
350 BOOST_STATIC_CONSTEXPR number_type epsilon() { return base_type::epsilon(); }
351 BOOST_STATIC_CONSTEXPR number_type round_error() { return epsilon() / 2; }
352 BOOST_STATIC_CONSTEXPR number_type infinity() { return base_type::infinity(); }
353 BOOST_STATIC_CONSTEXPR number_type quiet_NaN() { return base_type::quiet_NaN(); }
354 BOOST_STATIC_CONSTEXPR number_type signaling_NaN() { return base_type::signaling_NaN(); }
355 BOOST_STATIC_CONSTEXPR number_type denorm_min() { return base_type::denorm_min(); }
358 #ifndef BOOST_NO_INCLASS_MEMBER_INITIALIZATION
360 template <class IntBackend, boost::multiprecision::expression_template_option ExpressionTemplates>
361 BOOST_CONSTEXPR_OR_CONST bool numeric_limits<boost::multiprecision::number<boost::multiprecision::rational_adaptor<IntBackend>, ExpressionTemplates> >::is_integer;
362 template <class IntBackend, boost::multiprecision::expression_template_option ExpressionTemplates>
363 BOOST_CONSTEXPR_OR_CONST bool numeric_limits<boost::multiprecision::number<boost::multiprecision::rational_adaptor<IntBackend>, ExpressionTemplates> >::is_exact;