| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | //====================================================================================================================== | ||
| 2 | /* | ||
| 3 | KUMI - Compact Tuple Tools | ||
| 4 | Copyright : KUMI Project Contributors | ||
| 5 | SPDX-License-Identifier: BSL-1.0 | ||
| 6 | */ | ||
| 7 | //====================================================================================================================== | ||
| 8 | #pragma once | ||
| 9 | |||
| 10 | namespace kumi | ||
| 11 | { | ||
| 12 | namespace _ | ||
| 13 | { | ||
| 14 | template<typename Pred, typename T, std::size_t... I> | ||
| 15 | 36 | KUMI_HIDDEN_ABI constexpr std::size_t locate_(kumi::_::adl_tag_t, Pred p, T&& t, std::index_sequence<I...>) noexcept | |
| 16 | { | ||
| 17 | 36 | std::size_t index = kumi::size_v<T>; | |
| 18 |
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264 | ((kumi::invoke(p, get<I>(KUMI_FWD(t))) && ((index = I), true)) || ...); |
| 19 | 36 | return index; | |
| 20 | } | ||
| 21 | } | ||
| 22 | |||
| 23 | struct locate_t | ||
| 24 | { | ||
| 25 | template<typename Pred, kumi::concepts::product_type T> | ||
| 26 | [[nodiscard]] KUMI_ABI constexpr std::size_t operator()(T&& t, Pred p) const noexcept | ||
| 27 | { | ||
| 28 | if constexpr (kumi::concepts::empty_product_type<T>) return 0; | ||
| 29 | 9 | else if constexpr (kumi::concepts::record_type<T>) return (*this)(kumi::values_of(KUMI_FWD(t)), p); | |
| 30 | 18 | else return locate_(kumi::_::adl_tag, p, KUMI_FWD(t), kumi::function::indexes_for<T>{}); | |
| 31 | } | ||
| 32 | }; | ||
| 33 | |||
| 34 | //==================================================================================================================== | ||
| 35 | /** | ||
| 36 | @ingroup kumi_queries | ||
| 37 | |||
| 38 | @var locate | ||
| 39 | @brief Callable object returning the index of a value whose type satisfies a given predicate | ||
| 40 | |||
| 41 | On record types, this function operates as if the elements are ordered. The considered order is the order of | ||
| 42 | declaration. | ||
| 43 | |||
| 44 | @qualifier nodiscard | ||
| 45 | @qualifier inline | ||
| 46 | @qualifier constexpr | ||
| 47 | @qualifier noexcept | ||
| 48 | |||
| 49 | @groupheader{Header file} | ||
| 50 | @code | ||
| 51 | #include <kumi/algorithm/find.hpp> | ||
| 52 | @endcode | ||
| 53 | |||
| 54 | @groupheader{Call Signature} | ||
| 55 | |||
| 56 | @code | ||
| 57 | template<product_type T, typename Predicate> | ||
| 58 | constexpr auto locate(T && t, Pred p) noexcept; | ||
| 59 | @endcode | ||
| 60 | |||
| 61 | @subgroupheader{Parameters} | ||
| 62 | |||
| 63 | - `t`: Product Type to process | ||
| 64 | - `p`: Unary predicate. p must return a value convertible to `bool` for every element of t. | ||
| 65 | |||
| 66 | @subgroupheader{Return value} | ||
| 67 | |||
| 68 | - The integral index of the element inside `t` that matches the predicate, size_v<T> otherwise. | ||
| 69 | |||
| 70 | @groupheader{Examples} | ||
| 71 | |||
| 72 | @tab_begin | ||
| 73 | |||
| 74 | @tab{Tuple} | ||
| 75 | @godbolt{doc/tuple/algo/locate.cpp} | ||
| 76 | |||
| 77 | @tab{Record} | ||
| 78 | @godbolt{doc/record/algo/locate.cpp} | ||
| 79 | |||
| 80 | @tab_end | ||
| 81 | **/ | ||
| 82 | //==================================================================================================================== | ||
| 83 | KUMI_VARIABLE_ABI constexpr locate_t locate{}; | ||
| 84 | } | ||
| 85 |