| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | //====================================================================================================================== | ||
| 2 | /* | ||
| 3 | POLYFLOAT - Extended precision floating points | ||
| 4 | Copyright : POLYFLOAT Contributors & Maintainers | ||
| 5 | SPDX-License-Identifier: BSL-1.0 | ||
| 6 | */ | ||
| 7 | //====================================================================================================================== | ||
| 8 | #pragma once | ||
| 9 | |||
| 10 | #include <polyfloat/details/callable.hpp> | ||
| 11 | #include <polyfloat/types/concepts.hpp> | ||
| 12 | #include <polyfloat/types/traits.hpp> | ||
| 13 | #include <type_traits> | ||
| 14 | #include <polyfloat/module/core/trunc.hpp> | ||
| 15 | #include <polyfloat/module/core/nearest.hpp> | ||
| 16 | #include <polyfloat/module/core/ceil.hpp> | ||
| 17 | #include <polyfloat/module/core/floor.hpp> | ||
| 18 | |||
| 19 | namespace plf | ||
| 20 | { | ||
| 21 | |||
| 22 | template<typename Options> | ||
| 23 | struct sign_alternate_t : eve::callable<sign_alternate_t, | ||
| 24 | Options, | ||
| 25 | raw_option, | ||
| 26 | pedantic_option, | ||
| 27 | to_nearest_option, | ||
| 28 | toward_zero_option, | ||
| 29 | downward_option, | ||
| 30 | upward_option> | ||
| 31 | { | ||
| 32 | 8 | template<concepts::polyfloat_like Z> POLYFLOAT_ABI Z operator()(Z z) const noexcept { return POLYFLOAT_CALL(z); } | |
| 33 | |||
| 34 | 8 | POLYFLOAT_CALLABLE_OBJECT(sign_alternate_t, sign_alternate_); | |
| 35 | }; | ||
| 36 | //====================================================================================================================== | ||
| 37 | //! @addtogroup core | ||
| 38 | //! @{ | ||
| 39 | //! @var sign_alternate | ||
| 40 | //! @brief return the sign_alternateender after division of the values. | ||
| 41 | //! | ||
| 42 | //! @groupheader{Header file} | ||
| 43 | //! | ||
| 44 | //! @code | ||
| 45 | //! #include <polyfloat/core.hpp> | ||
| 46 | //! @endcode | ||
| 47 | //! | ||
| 48 | //! @groupheader{Callable Signatures} | ||
| 49 | //! | ||
| 50 | //! @code | ||
| 51 | //! namespace polyfloat | ||
| 52 | //! { | ||
| 53 | //! template<polyfloat::concepts::polyfloat_like T1, polyfloat_like T2> constexpr auto sign_alternate(T1 x, T2 y) noexcept; //1 | ||
| 54 | //! | ||
| 55 | //! // Semantic exclusive options | ||
| 56 | //! constexpr auto sign_alternate[upward](/*any of the above overloads*/) noexcept; // 2 | ||
| 57 | //! constexpr auto sign_alternate[downward](/*any of the above overloads*/) noexcept; // 2 | ||
| 58 | //! constexpr auto sign_alternate[toward_zero](/*any of the above overloads*/) noexcept; // 2 | ||
| 59 | //! constexpr auto sign_alternate[to_nearest](/*any of the above overloads*/) noexcept; // 2 | ||
| 60 | //! } | ||
| 61 | //! @endcode | ||
| 62 | //! | ||
| 63 | //! **Parameters** | ||
| 64 | //! | ||
| 65 | //! * `z1`: Value to process. | ||
| 66 | //! | ||
| 67 | //! **Return value** | ||
| 68 | //! | ||
| 69 | //! 1. Return \f$(-1)^\tilde n\f$ is returned, where \f$\tilde n\f$ is the truncation of `n`. | ||
| 70 | //! 2. The chosen rounding option is applyied to `n` before computation, instead of truncation. | ||
| 71 | //! | ||
| 72 | //! | ||
| 73 | //! @groupheader{Example} | ||
| 74 | //! | ||
| 75 | //! @godbolt_todo{doc/core/sign_alternate.cpp} | ||
| 76 | //====================================================================================================================== | ||
| 77 | |||
| 78 | inline constexpr auto sign_alternate = eve::functor<sign_alternate_t>; | ||
| 79 | //====================================================================================================================== | ||
| 80 | //! @} | ||
| 81 | //====================================================================================================================== | ||
| 82 | } | ||
| 83 | |||
| 84 | namespace plf::_ | ||
| 85 | { | ||
| 86 | template<typename T, eve::callable_options O> | ||
| 87 | 8 | constexpr auto sign_alternate_(POLYFLOAT_DELAY(), O const& o, T n) noexcept | |
| 88 | { | ||
| 89 | if constexpr (O::contains_any(upward, downward, to_nearest, toward_zero)) | ||
| 90 | return plf::if_else(is_odd(plf::round[o](n)), eve::mone, plf::one(as(n))); | ||
| 91 | 8 | else return plf::if_else(is_odd(plf::trunc(n)), eve::mone, plf::one(as(n))); | |
| 92 | } | ||
| 93 | } | ||
| 94 |