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-// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
-
-#pragma once
-
-/*! \file rx-all.hpp
-
- \brief Returns an Observable that emits true if every item emitted by the source Observable satisfies a specified condition, otherwise false.
- Emits true if the source Observable terminates without emitting any item.
-
- \tparam Predicate the type of the test function.
-
- \param p the test function to test items emitted by the source Observable.
-
- \return Observable that emits true if every item emitted by the source observable satisfies a specified condition, otherwise false.
-
- \sample
- \snippet all.cpp all sample
- \snippet output.txt all sample
-*/
-
-#if !defined(RXCPP_OPERATORS_RX_ALL_HPP)
-#define RXCPP_OPERATORS_RX_ALL_HPP
-
-#include "../rx-includes.hpp"
-
-namespace rxcpp {
-
-namespace operators {
-
-namespace detail {
-
-template<class... AN>
-struct all_invalid_arguments {};
-
-template<class... AN>
-struct all_invalid : public rxo::operator_base<all_invalid_arguments<AN...>> {
- using type = observable<all_invalid_arguments<AN...>, all_invalid<AN...>>;
-};
-template<class... AN>
-using all_invalid_t = typename all_invalid<AN...>::type;
-
-template<class T, class Predicate>
-struct all
-{
- typedef rxu::decay_t<T> source_value_type;
- typedef rxu::decay_t<Predicate> test_type;
- test_type test;
-
- typedef bool value_type;
-
- all(test_type t)
- : test(std::move(t))
- {
- }
-
- template<class Subscriber>
- struct all_observer
- {
- typedef all_observer<Subscriber> this_type;
- typedef source_value_type value_type;
- typedef rxu::decay_t<Subscriber> dest_type;
- typedef observer<value_type, this_type> observer_type;
- dest_type dest;
- test_type test;
- mutable bool done;
-
- all_observer(dest_type d, test_type t)
- : dest(std::move(d))
- , test(std::move(t)),
- done(false)
- {
- }
- void on_next(source_value_type v) const {
- auto filtered = on_exception([&]() {
- return !this->test(v); },
- dest);
- if (filtered.empty()) {
- return;
- }
- if (filtered.get() && !done) {
- done = true;
- dest.on_next(false);
- dest.on_completed();
- }
- }
- void on_error(rxu::error_ptr e) const {
- dest.on_error(e);
- }
- void on_completed() const {
- if(!done) {
- done = true;
- dest.on_next(true);
- dest.on_completed();
- }
- }
-
- static subscriber<value_type, observer_type> make(dest_type d, test_type t) {
- return make_subscriber<value_type>(d, this_type(d, std::move(t)));
- }
- };
-
- template<class Subscriber>
- auto operator()(Subscriber dest) const
- -> decltype(all_observer<Subscriber>::make(std::move(dest), test)) {
- return all_observer<Subscriber>::make(std::move(dest), test);
- }
-};
-
-}
-
-/*! @copydoc rx-all.hpp
-*/
-template<class... AN>
-auto all(AN&&... an)
- -> operator_factory<all_tag, AN...> {
- return operator_factory<all_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
-}
-
-/*! \brief Returns an Observable that emits true if the source Observable is empty, otherwise false.
-
- \return An observable that emits a boolean value.
-
- \sample
- \snippet is_empty.cpp is_empty sample
- \snippet output.txt is_empty sample
-*/
-template<class... AN>
-auto is_empty(AN&&... an)
--> operator_factory<is_empty_tag, AN...> {
- return operator_factory<is_empty_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
-}
-
-}
-
-template<>
-struct member_overload<all_tag>
-{
- template<class Observable, class Predicate,
- class SourceValue = rxu::value_type_t<Observable>,
- class Enabled = rxu::enable_if_all_true_type_t<
- is_observable<Observable>>,
- class All = rxo::detail::all<SourceValue, rxu::decay_t<Predicate>>,
- class Value = rxu::value_type_t<All>>
- static auto member(Observable&& o, Predicate&& p)
- -> decltype(o.template lift<Value>(All(std::forward<Predicate>(p)))) {
- return o.template lift<Value>(All(std::forward<Predicate>(p)));
- }
-
- template<class... AN>
- static operators::detail::all_invalid_t<AN...> member(const AN&...) {
- std::terminate();
- return {};
- static_assert(sizeof...(AN) == 10000, "all takes (Predicate)");
- }
-};
-
-template<>
-struct member_overload<is_empty_tag>
-{
- template<class Observable,
- class SourceValue = rxu::value_type_t<Observable>,
- class Enabled = rxu::enable_if_all_true_type_t<
- is_observable<Observable>>,
- class Predicate = std::function<bool(SourceValue)>,
- class IsEmpty = rxo::detail::all<SourceValue, rxu::decay_t<Predicate>>,
- class Value = rxu::value_type_t<IsEmpty>>
- static auto member(Observable&& o)
- -> decltype(o.template lift<Value>(IsEmpty(nullptr))) {
- return o.template lift<Value>(IsEmpty([](SourceValue) { return false; }));
- }
-
- template<class... AN>
- static operators::detail::all_invalid_t<AN...> member(AN...) {
- std::terminate();
- return {};
- static_assert(sizeof...(AN) == 10000, "is_empty takes no arguments");
- }
-};
-
-}
-
-#endif