File indexing completed on 2024-06-16 05:06:54
0001 /* 0002 SPDX-FileCopyrightText: 2018 Ivan Čukić <ivan.cukic(at)kde.org> 0003 0004 SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL 0005 */ 0006 0007 #ifndef VOY_OPERATIONS_FILTER_H 0008 #define VOY_OPERATIONS_FILTER_H 0009 0010 // STL 0011 #include <functional> 0012 0013 // Self 0014 #include "../utils.h" 0015 #include "../traits.h" 0016 #include "../dsl/node_tags.h" 0017 0018 namespace voy { 0019 0020 using voy::utils::non_copyable; 0021 0022 using voy::dsl::continuator_base, 0023 voy::dsl::transformation_node_tag; 0024 0025 template <typename Pred> 0026 class filter { 0027 public: 0028 using node_category = transformation_node_tag; 0029 0030 explicit filter(Pred predicate) 0031 : m_predicate{std::move(predicate)} 0032 { 0033 } 0034 0035 template <typename Cont> 0036 class node: public continuator_base<Cont>, non_copyable { 0037 using base = continuator_base<Cont>; 0038 0039 public: 0040 node(Pred predicate, Cont&& continuation) 0041 : base{std::move(continuation)} 0042 , m_predicate{std::move(predicate)} 0043 { 0044 } 0045 0046 template <typename T> 0047 void operator() (T&& value) const 0048 { 0049 if (std::invoke(m_predicate, value)) { 0050 base::emit(voy_fwd(value)); 0051 } 0052 } 0053 0054 private: 0055 Pred m_predicate; 0056 }; 0057 0058 template <typename Cont> 0059 auto with_continuation(Cont&& cont) && 0060 { 0061 return node<Cont>(std::move(m_predicate), voy_fwd(cont)); 0062 } 0063 0064 0065 private: 0066 Pred m_predicate; 0067 }; 0068 0069 0070 template <typename Pred> 0071 auto remove_if(Pred&& pred) 0072 { 0073 return filter{std::not_fn(pred)}; 0074 } 0075 0076 0077 } // namespace voy 0078 0079 #endif // include guard 0080