91 lines
2.7 KiB
C++
91 lines
2.7 KiB
C++
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// 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-connect_forever.hpp
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\brief takes a connectable_observable source and calls connect during the construction of the expression.
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This means that the source starts running without any subscribers and continues running after all subscriptions have been unsubscribed.
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\return An observable that emitting the items from its source.
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*/
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#if !defined(RXCPP_OPERATORS_RX_CONNECT_FOREVER_HPP)
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#define RXCPP_OPERATORS_RX_CONNECT_FOREVER_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 connect_forever_invalid_arguments {};
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template<class... AN>
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struct connect_forever_invalid : public rxo::operator_base<connect_forever_invalid_arguments<AN...>> {
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using type = observable<connect_forever_invalid_arguments<AN...>, connect_forever_invalid<AN...>>;
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};
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template<class... AN>
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using connect_forever_invalid_t = typename connect_forever_invalid<AN...>::type;
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template<class T, class ConnectableObservable>
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struct connect_forever : public operator_base<T>
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{
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typedef rxu::decay_t<ConnectableObservable> source_type;
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source_type source;
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explicit connect_forever(source_type o)
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: source(std::move(o))
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{
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source.connect();
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}
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template<class Subscriber>
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void on_subscribe(Subscriber&& o) const {
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source.subscribe(std::forward<Subscriber>(o));
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}
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};
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}
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/*! @copydoc rx-connect_forever.hpp
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*/
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template<class... AN>
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auto connect_forever(AN&&... an)
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-> operator_factory<connect_forever_tag, AN...> {
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return operator_factory<connect_forever_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<connect_forever_tag>
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{
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template<class ConnectableObservable,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_connectable_observable<ConnectableObservable>>,
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class SourceValue = rxu::value_type_t<ConnectableObservable>,
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class ConnectForever = rxo::detail::connect_forever<SourceValue, rxu::decay_t<ConnectableObservable>>,
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class Value = rxu::value_type_t<ConnectForever>,
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class Result = observable<Value, ConnectForever>
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>
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static Result member(ConnectableObservable&& o) {
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return Result(ConnectForever(std::forward<ConnectableObservable>(o)));
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}
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template<class... AN>
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static operators::detail::connect_forever_invalid_t<AN...> member(AN...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "connect_forever takes no arguments");
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}
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};
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}
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#endif
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