1 ///////////////////////////////////////////////////////////////////////////////
2 // Copyright 2016 John Maddock. Distributed under the Boost
3 // Software License, Version 1.0. (See accompanying file
4 // LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6 #ifndef BOOST_MP_MIN_MAX_HPP
7 #define BOOST_MP_MIN_MAX_HPP
9 #include <boost/multiprecision/traits/is_backend.hpp>
11 namespace boost { namespace multiprecision {
14 // Expression template overloads for (min) and (max):
16 // Introduced in response to https://svn.boost.org/trac/boost/ticket/11149
17 // note that these can not legally be injected into namespace std, and that doing so
18 // may break future enhancements to the standard. None the less adding
19 // namespace std{ using boost::multiprecision::(min); using boost::multiprecision::(max); }
20 // to your code may get some generic code working that wouldn't work otherwise.
22 // The use of enable_if on the return type is to avoid poisoning std::min/max,
23 // otherwise attempting to make an explicit call to min<long>(a, b) when these and std
24 // versions are in scope, will cause the compiler to try to instantiate the signatures
25 // for our versions as well as the std ones, which in turn instantiates number<long>
26 // which fails to compile as "long" is not a valid backend type.
28 template <class Backend>
29 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on>&>::type(min)(const number<Backend, et_on>& a, const number<Backend, et_on>& b)
33 template <class Backend, class tag, class A1, class A2, class A3, class A4>
34 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(min)(const number<Backend, et_on>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
36 number<Backend, et_on> t(b);
39 return BOOST_MP_MOVE(t);
41 template <class tag, class A1, class A2, class A3, class A4, class Backend>
42 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(min)(const detail::expression<tag, A1, A2, A3, A4>& a, const number<Backend, et_on>& b)
44 number<Backend, et_on> t(a);
46 return BOOST_MP_MOVE(t);
49 template <class tag, class A1, class A2, class A3, class A4, class tagb, class A1b, class A2b, class A3b, class A4b>
50 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(min)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tagb, A1b, A2b, A3b, A4b>& b)
52 typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
54 return BOOST_MP_MOVE(t1);
55 return BOOST_MP_MOVE(t2);
57 template <class tag, class A1, class A2, class A3, class A4>
58 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(min)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
60 typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
62 return BOOST_MP_MOVE(t1);
63 return BOOST_MP_MOVE(t2);
66 template <class Backend>
67 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on>&>::type(max)(const number<Backend, et_on>& a, const number<Backend, et_on>& b)
71 template <class Backend, class tag, class A1, class A2, class A3, class A4>
72 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(max)(const number<Backend, et_on>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
74 number<Backend, et_on> t(b);
77 return BOOST_MP_MOVE(t);
79 template <class tag, class A1, class A2, class A3, class A4, class Backend>
80 inline typename boost::enable_if_c<boost::multiprecision::detail::is_backend<Backend>::value, const number<Backend, et_on> >::type(max)(const detail::expression<tag, A1, A2, A3, A4>& a, const number<Backend, et_on>& b)
82 number<Backend, et_on> t(a);
84 return BOOST_MP_MOVE(t);
87 template <class tag, class A1, class A2, class A3, class A4, class tagb, class A1b, class A2b, class A3b, class A4b>
88 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(max)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tagb, A1b, A2b, A3b, A4b>& b)
90 typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
92 return BOOST_MP_MOVE(t1);
93 return BOOST_MP_MOVE(t2);
95 template <class tag, class A1, class A2, class A3, class A4>
96 inline typename detail::expression<tag, A1, A2, A3, A4>::result_type(max)(const detail::expression<tag, A1, A2, A3, A4>& a, const detail::expression<tag, A1, A2, A3, A4>& b)
98 typename detail::expression<tag, A1, A2, A3, A4>::result_type t1(a), t2(b);
100 return BOOST_MP_MOVE(t1);
101 return BOOST_MP_MOVE(t2);
104 }} // namespace boost::multiprecision