diff options
Diffstat (limited to 'Rx/v2/src/rxcpp/operators/rx-take.hpp')
-rw-r--r-- | Rx/v2/src/rxcpp/operators/rx-take.hpp | 165 |
1 files changed, 0 insertions, 165 deletions
diff --git a/Rx/v2/src/rxcpp/operators/rx-take.hpp b/Rx/v2/src/rxcpp/operators/rx-take.hpp deleted file mode 100644 index 1e4da4d..0000000 --- a/Rx/v2/src/rxcpp/operators/rx-take.hpp +++ /dev/null @@ -1,165 +0,0 @@ -// 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 |