| 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 | |||
| 15 | namespace plf | ||
| 16 | { | ||
| 17 | |||
| 18 | template<typename Options> | ||
| 19 | struct prev_t : plf::elementwise_callable<prev_t, eve::prev_t, Options, raw_option, pedantic_option> | ||
| 20 | { | ||
| 21 | 3762 | template<concepts::polyfloat_like Z> POLYFLOAT_ABI constexpr Z operator()(Z z) const noexcept | |
| 22 | { | ||
| 23 | 3762 | return POLYFLOAT_CALL(z); | |
| 24 | } | ||
| 25 | |||
| 26 | template<concepts::polyfloat_like Z, eve::integral_value N> | ||
| 27 | POLYFLOAT_ABI constexpr Z operator()(Z z, N n) const noexcept | ||
| 28 | requires(eve::same_lanes_or_scalar<Z, N>) | ||
| 29 | { | ||
| 30 | EVE_ASSERT(eve::all(n >= 0), "[plf::prev] : second parameter must be positive"); | ||
| 31 | return POLYFLOAT_CALL(z, n); | ||
| 32 | } | ||
| 33 | |||
| 34 | 3756 | POLYFLOAT_CALLABLE_OBJECT(prev_t, prev_); | |
| 35 | }; | ||
| 36 | //====================================================================================================================== | ||
| 37 | //! @addtogroup core | ||
| 38 | //! @{ | ||
| 39 | //! @var prev | ||
| 40 | //! @brief return the previous representable value. | ||
| 41 | //! | ||
| 42 | //! @groupheader{Header file} | ||
| 43 | //! | ||
| 44 | //! @code | ||
| 45 | //! #include <polyfloat/module/core.hpp> | ||
| 46 | //! @endcode | ||
| 47 | //! | ||
| 48 | //! @groupheader{Callable Signatures} | ||
| 49 | //! | ||
| 50 | //! @code | ||
| 51 | //! namespace polyfloat | ||
| 52 | //! { | ||
| 53 | //! constexpr auto prev(value auto x) noexcept; // 1 | ||
| 54 | //! constexpr auto prev(value auto x, integral_value auto n) noexcept; // 2 | ||
| 55 | //! } | ||
| 56 | //! @endcode | ||
| 57 | //! | ||
| 58 | //! **Parameters** | ||
| 59 | //! | ||
| 60 | //! * `z`: Value to process. | ||
| 61 | //! * `n`: increment | ||
| 62 | //! | ||
| 63 | //! **Return value** | ||
| 64 | //! | ||
| 65 | //! Returns the previous nth representable value. | ||
| 66 | //! | ||
| 67 | //! @groupheader{Example} | ||
| 68 | //! | ||
| 69 | //! @godbolt{doc/core/prev.cpp} | ||
| 70 | //====================================================================================================================== | ||
| 71 | |||
| 72 | inline constexpr auto prev = eve::functor<prev_t>; | ||
| 73 | //====================================================================================================================== | ||
| 74 | //! @} | ||
| 75 | //====================================================================================================================== | ||
| 76 | } | ||
| 77 | |||
| 78 | namespace plf::_ | ||
| 79 | { | ||
| 80 | 3756 | template<typename Z, eve::callable_options O> constexpr auto prev_(POLYFLOAT_DELAY(), O const&, Z const& z) noexcept | |
| 81 | { | ||
| 82 | using c_t = plf::as_component_type_t<Z>; | ||
| 83 | if constexpr (dimension_v<Z> == 2) | ||
| 84 | { | ||
| 85 | 198 | auto [h, l] = z; | |
| 86 | 198 | return plf::_::from_pair<c_t>(h, eve::prev(l)); | |
| 87 | } | ||
| 88 | else if constexpr (dimension_v<Z> == 3) | ||
| 89 | { | ||
| 90 | 3558 | auto [h, m, l] = z; | |
| 91 | 3558 | return plf::_::from_triple<c_t>(h, m, eve::prev(l)); | |
| 92 | } | ||
| 93 | } | ||
| 94 | |||
| 95 | template<typename Z, typename N, eve::callable_options O> | ||
| 96 | constexpr auto prev_(POLYFLOAT_DELAY(), O const&, Z const& z, N n) noexcept | ||
| 97 | { | ||
| 98 | using c_t = plf::as_component_type_t<Z>; | ||
| 99 | if constexpr (dimension_v<Z> == 2) | ||
| 100 | { | ||
| 101 | auto [h, l] = z; | ||
| 102 | return plf::_::from_pair<c_t>(h, eve::prev(l, n)); | ||
| 103 | } | ||
| 104 | else if constexpr (dimension_v<Z> == 3) | ||
| 105 | { | ||
| 106 | auto [h, m, l] = z; | ||
| 107 | return plf::_::from_triple<c_t>(h, m, eve::prev(l, n)); | ||
| 108 | } | ||
| 109 | } | ||
| 110 | } | ||
| 111 |