| // Copyright John Maddock 2007. |
| // Use, modification and distribution are subject to 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) |
| |
| #ifndef BOOST_MATH_TRUNC_HPP |
| #define BOOST_MATH_TRUNC_HPP |
| |
| #ifdef _MSC_VER |
| #pragma once |
| #endif |
| |
| #include <boost/math/tools/config.hpp> |
| #include <boost/math/policies/error_handling.hpp> |
| #include <boost/math/special_functions/fpclassify.hpp> |
| |
| namespace boost{ namespace math{ |
| |
| template <class T, class Policy> |
| inline T trunc(const T& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| if(!(boost::math::isfinite)(v)) |
| return policies::raise_rounding_error("boost::math::trunc<%1%>(%1%)", 0, v, pol); |
| return (v >= 0) ? static_cast<T>(floor(v)) : static_cast<T>(ceil(v)); |
| } |
| template <class T> |
| inline T trunc(const T& v) |
| { |
| return trunc(v, policies::policy<>()); |
| } |
| // |
| // The following functions will not compile unless T has an |
| // implicit convertion to the integer types. For user-defined |
| // number types this will likely not be the case. In that case |
| // these functions should either be specialized for the UDT in |
| // question, or else overloads should be placed in the same |
| // namespace as the UDT: these will then be found via argument |
| // dependent lookup. See our concept archetypes for examples. |
| // |
| template <class T, class Policy> |
| inline int itrunc(const T& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| T r = boost::math::trunc(v, pol); |
| if(fabs(r) > (std::numeric_limits<int>::max)()) |
| return static_cast<int>(policies::raise_rounding_error("boost::math::itrunc<%1%>(%1%)", 0, v, pol)); |
| return static_cast<int>(r); |
| } |
| template <class T> |
| inline int itrunc(const T& v) |
| { |
| return itrunc(v, policies::policy<>()); |
| } |
| |
| template <class T, class Policy> |
| inline long ltrunc(const T& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| T r = boost::math::trunc(v, pol); |
| if(fabs(r) > (std::numeric_limits<long>::max)()) |
| return static_cast<long>(policies::raise_rounding_error("boost::math::ltrunc<%1%>(%1%)", 0, v, pol)); |
| return static_cast<long>(r); |
| } |
| template <class T> |
| inline long ltrunc(const T& v) |
| { |
| return ltrunc(v, policies::policy<>()); |
| } |
| |
| #ifdef BOOST_HAS_LONG_LONG |
| |
| template <class T, class Policy> |
| inline boost::long_long_type lltrunc(const T& v, const Policy& pol) |
| { |
| BOOST_MATH_STD_USING |
| T r = boost::math::trunc(v, pol); |
| if(fabs(r) > (std::numeric_limits<boost::long_long_type>::max)()) |
| return static_cast<boost::long_long_type>(policies::raise_rounding_error("boost::math::lltrunc<%1%>(%1%)", 0, v, pol)); |
| return static_cast<boost::long_long_type>(r); |
| } |
| template <class T> |
| inline boost::long_long_type lltrunc(const T& v) |
| { |
| return lltrunc(v, policies::policy<>()); |
| } |
| |
| #endif |
| |
| }} // namespaces |
| |
| #endif // BOOST_MATH_TRUNC_HPP |