261 lines
8.5 KiB
C++
261 lines
8.5 KiB
C++
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// Copyright John Maddock 2007.
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// Copyright Matt Borland 2023.
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// Use, modification and distribution are subject to the
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// Boost Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_MATH_TRUNC_HPP
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#define BOOST_MATH_TRUNC_HPP
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#ifdef _MSC_VER
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#pragma once
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#endif
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#include <type_traits>
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#include <boost/math/special_functions/math_fwd.hpp>
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#include <boost/math/tools/config.hpp>
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#include <boost/math/ccmath/detail/config.hpp>
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#include <boost/math/policies/error_handling.hpp>
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#include <boost/math/special_functions/fpclassify.hpp>
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#include <boost/math/tools/is_constant_evaluated.hpp>
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#if !defined(BOOST_MATH_NO_CCMATH) && !defined(BOOST_MATH_NO_CONSTEXPR_DETECTION)
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#include <boost/math/ccmath/ldexp.hpp>
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# define BOOST_MATH_HAS_CONSTEXPR_LDEXP
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#endif
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namespace boost{ namespace math{ namespace detail{
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template <class T, class Policy>
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inline tools::promote_args_t<T> trunc(const T& v, const Policy& pol, const std::false_type&)
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{
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BOOST_MATH_STD_USING
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using result_type = tools::promote_args_t<T>;
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if(!(boost::math::isfinite)(v))
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{
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return policies::raise_rounding_error("boost::math::trunc<%1%>(%1%)", nullptr, static_cast<result_type>(v), static_cast<result_type>(v), pol);
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}
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return (v >= 0) ? static_cast<result_type>(floor(v)) : static_cast<result_type>(ceil(v));
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}
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template <class T, class Policy>
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inline tools::promote_args_t<T> trunc(const T& v, const Policy&, const std::true_type&)
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{
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return v;
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}
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}
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template <class T, class Policy>
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inline tools::promote_args_t<T> trunc(const T& v, const Policy& pol)
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{
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return detail::trunc(v, pol, std::integral_constant<bool, detail::is_integer_for_rounding<T>::value>());
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}
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template <class T>
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inline tools::promote_args_t<T> trunc(const T& v)
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{
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return trunc(v, policies::policy<>());
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}
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//
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// The following functions will not compile unless T has an
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// implicit conversion to the integer types. For user-defined
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// number types this will likely not be the case. In that case
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// these functions should either be specialized for the UDT in
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// question, or else overloads should be placed in the same
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// namespace as the UDT: these will then be found via argument
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// dependent lookup. See our concept archetypes for examples.
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//
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// Non-standard numeric limits syntax "(std::numeric_limits<int>::max)()"
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// is to avoid macro substiution from MSVC
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// https://stackoverflow.com/questions/27442885/syntax-error-with-stdnumeric-limitsmax
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//
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template <class T, class Policy>
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inline int itrunc(const T& v, const Policy& pol)
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{
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BOOST_MATH_STD_USING
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using result_type = tools::promote_args_t<T>;
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result_type r = boost::math::trunc(v, pol);
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#ifdef BOOST_MATH_HAS_CONSTEXPR_LDEXP
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if constexpr (std::is_arithmetic_v<result_type>
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#ifdef BOOST_MATH_FLOAT128_TYPE
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&& !std::is_same_v<BOOST_MATH_FLOAT128_TYPE, result_type>
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#endif
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)
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{
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constexpr result_type max_val = boost::math::ccmath::ldexp(static_cast<result_type>(1), std::numeric_limits<int>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<int>(boost::math::policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", nullptr, v, static_cast<int>(0), pol));
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}
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}
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else
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{
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static const result_type max_val = ldexp(static_cast<result_type>(1), std::numeric_limits<int>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<int>(boost::math::policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", nullptr, v, static_cast<int>(0), pol));
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}
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}
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#else
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static const result_type max_val = ldexp(static_cast<result_type>(1), std::numeric_limits<int>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<int>(boost::math::policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", nullptr, v, static_cast<int>(0), pol));
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}
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#endif
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return static_cast<int>(r);
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}
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template <class T>
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inline int itrunc(const T& v)
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{
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return itrunc(v, policies::policy<>());
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}
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template <class T, class Policy>
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inline long ltrunc(const T& v, const Policy& pol)
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{
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BOOST_MATH_STD_USING
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using result_type = tools::promote_args_t<T>;
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result_type r = boost::math::trunc(v, pol);
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#ifdef BOOST_MATH_HAS_CONSTEXPR_LDEXP
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if constexpr (std::is_arithmetic_v<result_type>
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#ifdef BOOST_MATH_FLOAT128_TYPE
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&& !std::is_same_v<BOOST_MATH_FLOAT128_TYPE, result_type>
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#endif
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)
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{
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constexpr result_type max_val = boost::math::ccmath::ldexp(static_cast<result_type>(1), std::numeric_limits<long>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<long>(boost::math::policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", nullptr, v, static_cast<long>(0), pol));
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}
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}
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else
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{
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static const result_type max_val = ldexp(static_cast<result_type>(1), std::numeric_limits<long>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<long>(boost::math::policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", nullptr, v, static_cast<long>(0), pol));
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}
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}
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#else
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static const result_type max_val = ldexp(static_cast<result_type>(1), std::numeric_limits<long>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<long>(boost::math::policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", nullptr, v, static_cast<long>(0), pol));
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}
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#endif
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return static_cast<long>(r);
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}
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template <class T>
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inline long ltrunc(const T& v)
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{
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return ltrunc(v, policies::policy<>());
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}
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template <class T, class Policy>
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inline long long lltrunc(const T& v, const Policy& pol)
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{
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BOOST_MATH_STD_USING
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using result_type = tools::promote_args_t<T>;
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result_type r = boost::math::trunc(v, pol);
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#ifdef BOOST_MATH_HAS_CONSTEXPR_LDEXP
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if constexpr (std::is_arithmetic_v<result_type>
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#ifdef BOOST_MATH_FLOAT128_TYPE
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&& !std::is_same_v<BOOST_MATH_FLOAT128_TYPE, result_type>
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#endif
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)
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{
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constexpr result_type max_val = boost::math::ccmath::ldexp(static_cast<result_type>(1), std::numeric_limits<long long>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<long long>(boost::math::policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", nullptr, v, static_cast<long long>(0), pol));
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}
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}
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else
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{
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static const result_type max_val = ldexp(static_cast<result_type>(1), std::numeric_limits<long long>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<long long>(boost::math::policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", nullptr, v, static_cast<long long>(0), pol));
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}
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}
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#else
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static const result_type max_val = ldexp(static_cast<result_type>(1), std::numeric_limits<long long>::digits);
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if (r >= max_val || r < -max_val)
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{
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return static_cast<long long>(boost::math::policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", nullptr, v, static_cast<long long>(0), pol));
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}
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#endif
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return static_cast<long long>(r);
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}
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template <class T>
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inline long long lltrunc(const T& v)
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{
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return lltrunc(v, policies::policy<>());
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}
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template <class T, class Policy>
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inline typename std::enable_if<std::is_constructible<int, T>::value, int>::type
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iconvert(const T& v, const Policy&)
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{
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return static_cast<int>(v);
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}
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template <class T, class Policy>
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inline typename std::enable_if<!std::is_constructible<int, T>::value, int>::type
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iconvert(const T& v, const Policy& pol)
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{
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using boost::math::itrunc;
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return itrunc(v, pol);
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}
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template <class T, class Policy>
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inline typename std::enable_if<std::is_constructible<long, T>::value, long>::type
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lconvert(const T& v, const Policy&)
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{
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return static_cast<long>(v);
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}
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template <class T, class Policy>
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inline typename std::enable_if<!std::is_constructible<long, T>::value, long>::type
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lconvert(const T& v, const Policy& pol)
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{
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using boost::math::ltrunc;
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return ltrunc(v, pol);
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}
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template <class T, class Policy>
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inline typename std::enable_if<std::is_constructible<long long, T>::value, long long>::type
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llconvertert(const T& v, const Policy&)
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{
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return static_cast<long long>(v);
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}
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template <class T, class Policy>
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inline typename std::enable_if<!std::is_constructible<long long, T>::value, long long>::type
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llconvertert(const T& v, const Policy& pol)
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{
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using boost::math::lltrunc;
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return lltrunc(v, pol);
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}
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}} // namespaces
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#endif // BOOST_MATH_TRUNC_HPP
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