summaryrefslogtreecommitdiff
path: root/Rx/v2/src/rxcpp/operators/rx-element_at.hpp
diff options
context:
space:
mode:
Diffstat (limited to 'Rx/v2/src/rxcpp/operators/rx-element_at.hpp')
-rw-r--r--Rx/v2/src/rxcpp/operators/rx-element_at.hpp137
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