This is an automated email from the ASF dual-hosted git repository. jmalkin pushed a commit to branch patch_for_rc4 in repository https://gitbox.apache.org/repos/asf/incubator-datasketches-cpp.git
commit ef43c5ba50b9a4e901f06159946bb55535834e8e Author: AlexanderSaydakov <[email protected]> AuthorDate: Fri May 29 16:28:09 2020 -0700 conditional back inserter --- theta/include/conditional_back_inserter.hpp | 53 +++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) diff --git a/theta/include/conditional_back_inserter.hpp b/theta/include/conditional_back_inserter.hpp new file mode 100644 index 0000000..f128a3b --- /dev/null +++ b/theta/include/conditional_back_inserter.hpp @@ -0,0 +1,53 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +#ifndef CONDITIONAL_BACK_INSERTER_HPP_ +#define CONDITIONAL_BACK_INSERTER_HPP_ + +#include <iterator> +#include <functional> + +namespace datasketches { + +template <class Container, class Predicate> +class conditional_back_insert_iterator: public std::back_insert_iterator<Container> { +public: + conditional_back_insert_iterator(Container& c, Predicate& p): std::back_insert_iterator<Container>(c), p(p) {} + + conditional_back_insert_iterator& operator=(typename Container::const_reference value) { + if (p(value)) std::back_insert_iterator<Container>::operator=(value); + return *this; + } + + conditional_back_insert_iterator& operator*() { return *this; } + conditional_back_insert_iterator& operator++() { return *this; } + conditional_back_insert_iterator& operator++(int) { return *this; } + +private: + Predicate& p; +}; + +template< class Container, class Predicate> +conditional_back_insert_iterator<Container, Predicate> conditional_back_inserter(Container& c, Predicate& p) { + return conditional_back_insert_iterator<Container, Predicate>(c, p); +} + +} /* namespace datasketches */ + +#endif --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
