226 lines
6.8 KiB
C++
226 lines
6.8 KiB
C++
// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
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#pragma once
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/*! \file rx-any.hpp
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\brief Returns an Observable that emits true if any item emitted by the source Observable satisfies a specified condition, otherwise false. Emits false if the source Observable terminates without emitting any item.
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\tparam Predicate the type of the test function.
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\param p the test function to test items emitted by the source Observable.
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\return An observable that emits true if any item emitted by the source observable satisfies a specified condition, otherwise false.
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Some basic any- operators have already been implemented:
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- rxcpp::operators::exists
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- rxcpp::operators::contains
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\sample
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\snippet exists.cpp exists sample
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\snippet output.txt exists sample
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\sample
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\snippet contains.cpp contains sample
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\snippet output.txt contains sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_ANY_HPP)
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#define RXCPP_OPERATORS_RX_ANY_HPP
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#include "../rx-includes.hpp"
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namespace rxcpp {
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namespace operators {
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namespace detail {
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template<class... AN>
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struct any_invalid_arguments {};
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template<class... AN>
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struct any_invalid : public rxo::operator_base<any_invalid_arguments<AN...>> {
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using type = observable<any_invalid_arguments<AN...>, any_invalid<AN...>>;
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};
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template<class... AN>
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using any_invalid_t = typename any_invalid<AN...>::type;
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template<class T, class Predicate>
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struct any
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{
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typedef rxu::decay_t<T> source_value_type;
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typedef bool value_type;
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typedef rxu::decay_t<Predicate> test_type;
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test_type test;
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any(test_type t)
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: test(std::move(t))
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{
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}
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template<class Subscriber>
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struct any_observer
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{
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typedef any_observer<Subscriber> this_type;
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typedef source_value_type value_type;
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typedef rxu::decay_t<Subscriber> dest_type;
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typedef observer<value_type, this_type> observer_type;
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dest_type dest;
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test_type test;
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mutable bool done;
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any_observer(dest_type d, test_type t)
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: dest(std::move(d))
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, test(std::move(t)),
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done(false)
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{
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}
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void on_next(source_value_type v) const {
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auto filtered = on_exception([&]() {
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return !this->test(v); },
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dest);
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if (filtered.empty()) {
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return;
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}
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if (!filtered.get() && !done) {
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done = true;
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dest.on_next(true);
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dest.on_completed();
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}
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}
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void on_error(rxu::error_ptr e) const {
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dest.on_error(e);
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}
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void on_completed() const {
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if(!done) {
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done = true;
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dest.on_next(false);
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dest.on_completed();
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}
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}
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static subscriber<value_type, observer_type> make(dest_type d, test_type t) {
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return make_subscriber<value_type>(d, this_type(d, std::move(t)));
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}
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};
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template<class Subscriber>
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auto operator()(Subscriber dest) const
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-> decltype(any_observer<Subscriber>::make(std::move(dest), test)) {
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return any_observer<Subscriber>::make(std::move(dest), test);
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}
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};
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}
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/*! @copydoc rx-any.hpp
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*/
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template<class... AN>
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auto any(AN&&... an)
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-> operator_factory<any_tag, AN...> {
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return operator_factory<any_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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/*! \brief Returns an Observable that emits true if any item emitted by the source Observable satisfies a specified condition, otherwise false. Emits false if the source Observable terminates without emitting any item.
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\tparam Predicate the type of the test function.
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\param p the test function to test items emitted by the source Observable.
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\return An observable that emits true if any item emitted by the source observable satisfies a specified condition, otherwise false.
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\sample
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\snippet exists.cpp exists sample
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\snippet output.txt exists sample
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*/
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template<class... AN>
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auto exists(AN&&... an)
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-> operator_factory<exists_tag, AN...> {
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return operator_factory<exists_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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/*! \brief Returns an Observable that emits true if the source Observable emitted a specified item, otherwise false. Emits false if the source Observable terminates without emitting any item.
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\tparam T the type of the item to search for.
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\param value the item to search for.
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\return An observable that emits true if the source Observable emitted a specified item, otherwise false.
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\sample
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\snippet contains.cpp contains sample
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\snippet output.txt contains sample
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*/
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template<class... AN>
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auto contains(AN&&... an)
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-> operator_factory<contains_tag, AN...> {
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return operator_factory<contains_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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}
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template<>
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struct member_overload<any_tag>
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{
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template<class Observable, class Predicate,
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class SourceValue = rxu::value_type_t<Observable>,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class Any = rxo::detail::any<SourceValue, rxu::decay_t<Predicate>>,
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class Value = rxu::value_type_t<Any>>
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static auto member(Observable&& o, Predicate&& p)
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-> decltype(o.template lift<Value>(Any(std::forward<Predicate>(p)))) {
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return o.template lift<Value>(Any(std::forward<Predicate>(p)));
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}
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template<class... AN>
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static operators::detail::any_invalid_t<AN...> member(const AN&...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "any takes (Predicate)");
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}
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};
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template<>
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struct member_overload<exists_tag>
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: member_overload<any_tag>
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{
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using member_overload<any_tag>::member;
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template<class... AN>
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static operators::detail::any_invalid_t<AN...> member(const AN&...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "exists takes (Predicate)");
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}
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};
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template<>
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struct member_overload<contains_tag>
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{
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template<class Observable, class T,
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class SourceValue = rxu::value_type_t<Observable>,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class Predicate = std::function<bool(T)>,
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class Any = rxo::detail::any<SourceValue, rxu::decay_t<Predicate>>,
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class Value = rxu::value_type_t<Any>>
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static auto member(Observable&& o, T&& value)
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-> decltype(o.template lift<Value>(Any(nullptr))) {
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return o.template lift<Value>(Any([value](T n) { return n == value; }));
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}
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template<class... AN>
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static operators::detail::any_invalid_t<AN...> member(const AN&...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "contains takes (T)");
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}
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};
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}
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#endif
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