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Diffstat (limited to 'Rx/v2/src/rxcpp/operators/rx-element_at.hpp')
-rw-r--r-- | Rx/v2/src/rxcpp/operators/rx-element_at.hpp | 137 |
1 files changed, 0 insertions, 137 deletions
diff --git a/Rx/v2/src/rxcpp/operators/rx-element_at.hpp b/Rx/v2/src/rxcpp/operators/rx-element_at.hpp deleted file mode 100644 index 1d773ac..0000000 --- a/Rx/v2/src/rxcpp/operators/rx-element_at.hpp +++ /dev/null @@ -1,137 +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-element_at.hpp - - \brief Pulls an item located at a specified index location in the sequence of items and emits that item as its own sole emission. - - \param index the index of the element to return. - - \return An observable that emit an item located at a specified index location. - - \sample - \snippet element_at.cpp element_at sample - \snippet output.txt element_at sample -*/ - -#if !defined(RXCPP_OPERATORS_RX_ELEMENT_AT_HPP) -#define RXCPP_OPERATORS_RX_ELEMENT_AT_HPP - -#include "../rx-includes.hpp" - -namespace rxcpp { - -namespace operators { - -namespace detail { - -template<class... AN> -struct element_at_invalid_arguments {}; - -template<class... AN> -struct element_at_invalid : public rxo::operator_base<element_at_invalid_arguments<AN...>> { - using type = observable<element_at_invalid_arguments<AN...>, element_at_invalid<AN...>>; -}; -template<class... AN> -using element_at_invalid_t = typename element_at_invalid<AN...>::type; - -template<class T> -struct element_at { - typedef rxu::decay_t<T> source_value_type; - - struct element_at_values { - element_at_values(int i) - : index(i) - { - } - int index; - }; - - element_at_values initial; - - element_at(int i) - : initial(i) - { - } - - template<class Subscriber> - struct element_at_observer : public element_at_values - { - typedef element_at_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; - mutable int current; - - element_at_observer(dest_type d, element_at_values v) - : element_at_values(v), - dest(d), - current(0) - { - } - void on_next(source_value_type v) const { - if (current++ == this->index) { - dest.on_next(v); - dest.on_completed(); - } - } - void on_error(rxu::error_ptr e) const { - dest.on_error(e); - } - void on_completed() const { - if(current <= this->index) { - dest.on_error(rxu::make_error_ptr(std::range_error("index is out of bounds"))); - } - } - - static subscriber<value_type, observer_type> make(dest_type d, element_at_values v) { - return make_subscriber<value_type>(d, this_type(d, v)); - } - }; - - template<class Subscriber> - auto operator()(Subscriber dest) const - -> decltype(element_at_observer<Subscriber>::make(std::move(dest), initial)) { - return element_at_observer<Subscriber>::make(std::move(dest), initial); - } -}; - -} - -/*! @copydoc rx-element_at.hpp -*/ -template<class... AN> -auto element_at(AN&&... an) - -> operator_factory<element_at_tag, AN...> { - return operator_factory<element_at_tag, AN...>(std::make_tuple(std::forward<AN>(an)...)); -} - -} - -template<> -struct member_overload<element_at_tag> -{ - template<class Observable, - class Enabled = rxu::enable_if_all_true_type_t< - is_observable<Observable> - >, - class SourceValue = rxu::value_type_t<Observable>, - class element_at = rxo::detail::element_at<SourceValue>> - static auto member(Observable&& o, int index) - -> decltype(o.template lift<SourceValue>(element_at(index))) { - return o.template lift<SourceValue>(element_at(index)); - } - - template<class... AN> - static operators::detail::element_at_invalid_t<AN...> member(const AN...) { - std::terminate(); - return {}; - static_assert(sizeof...(AN) == 10000, "element_at takes (required int)"); - } -}; - -} - -#endif |