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-rw-r--r--Rx/v2/src/rxcpp/operators/rx-take.hpp165
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diff --git a/Rx/v2/src/rxcpp/operators/rx-take.hpp b/Rx/v2/src/rxcpp/operators/rx-take.hpp
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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-take.hpp
-
- \brief For the first count items from this observable emit them from the new observable that is returned.
-
- \tparam Count the type of the items counter.
-
- \param t the number of items to take.
-
- \return An observable that emits only the first t items emitted by the source Observable, or all of the items from the source observable if that observable emits fewer than t items.
-
- \sample
- \snippet take.cpp take sample
- \snippet output.txt take sample
-*/
-
-#if !defined(RXCPP_OPERATORS_RX_TAKE_HPP)
-#define RXCPP_OPERATORS_RX_TAKE_HPP
-
-#include "../rx-includes.hpp"
-
-namespace rxcpp {
-
-namespace operators {
-
-namespace detail {
-
-template<class... AN>
-struct take_invalid_arguments {};
-
-template<class... AN>
-struct take_invalid : public rxo::operator_base<take_invalid_arguments<AN...>> {
- using type = observable<take_invalid_arguments<AN...>, take_invalid<AN...>>;
-};
-template<class... AN>
-using take_invalid_t = typename take_invalid<AN...>::type;
-
-template<class T, class Observable, class Count>
-struct take : public operator_base<T>
-{
- typedef rxu::decay_t<Observable> source_type;
- typedef rxu::decay_t<Count> count_type;
- struct values
- {
- values(source_type s, count_type t)
- : source(std::move(s))
- , count(std::move(t))
- {
- }
- source_type source;
- count_type count;
- };
- values initial;
-
- take(source_type s, count_type t)
- : initial(std::move(s), std::move(t))
- {
- }
-
- struct mode
- {
- enum type {
- taking, // capture messages
- triggered, // ignore messages
- errored, // error occured
- stopped // observable completed
- };
- };
-
- template<class Subscriber>
- void on_subscribe(const Subscriber& s) const {
-
- typedef Subscriber output_type;
- struct state_type
- : public std::enable_shared_from_this<state_type>
- , public values
- {
- state_type(const values& i, const output_type& oarg)
- : values(i)
- , mode_value(mode::taking)
- , out(oarg)
- {
- }
- typename mode::type mode_value;
- output_type out;
- };
- // take a copy of the values for each subscription
- auto state = std::make_shared<state_type>(initial, s);
-
- composite_subscription source_lifetime;
-
- s.add(source_lifetime);
-
- state->source.subscribe(
- // split subscription lifetime
- source_lifetime,
- // on_next
- [state, source_lifetime](T t) {
- if (state->mode_value < mode::triggered) {
- if (--state->count > 0) {
- state->out.on_next(t);
- } else {
- state->mode_value = mode::triggered;
- state->out.on_next(t);
- // must shutdown source before signaling completion
- source_lifetime.unsubscribe();
- state->out.on_completed();
- }
- }
- },
- // on_error
- [state](rxu::error_ptr e) {
- state->mode_value = mode::errored;
- state->out.on_error(e);
- },
- // on_completed
- [state]() {
- state->mode_value = mode::stopped;
- state->out.on_completed();
- }
- );
- }
-};
-
-}
-
-/*! @copydoc rx-take.hpp
-*/
-template<class... AN>
-auto take(AN&&... an)
- -> operator_factory<take_tag, AN...> {
- return operator_factory<take_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
-}
-
-}
-
-template<>
-struct member_overload<take_tag>
-{
- template<class Observable,
- class Count,
- class Enabled = rxu::enable_if_all_true_type_t<
- is_observable<Observable>>,
- class SourceValue = rxu::value_type_t<Observable>,
- class Take = rxo::detail::take<SourceValue, rxu::decay_t<Observable>, rxu::decay_t<Count>>,
- class Value = rxu::value_type_t<Take>,
- class Result = observable<Value, Take>>
- static Result member(Observable&& o, Count&& c) {
- return Result(Take(std::forward<Observable>(o), std::forward<Count>(c)));
- }
-
- template<class... AN>
- static operators::detail::take_invalid_t<AN...> member(AN...) {
- std::terminate();
- return {};
- static_assert(sizeof...(AN) == 10000, "take takes (optional Count)");
- }
-};
-
-}
-
-#endif