146 lines
4.2 KiB
C++
146 lines
4.2 KiB
C++
// 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-map.hpp
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\brief For each item from this observable use Selector to produce an item to emit from the new observable that is returned.
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\tparam Selector the type of the transforming function
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\param s the selector function
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\return Observable that emits the items from the source observable, transformed by the specified function.
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\sample
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\snippet map.cpp map sample
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\snippet output.txt map sample
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*/
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#if !defined(RXCPP_OPERATORS_RX_MAP_HPP)
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#define RXCPP_OPERATORS_RX_MAP_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 map_invalid_arguments {};
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template<class... AN>
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struct map_invalid : public rxo::operator_base<map_invalid_arguments<AN...>> {
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using type = observable<map_invalid_arguments<AN...>, map_invalid<AN...>>;
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};
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template<class... AN>
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using map_invalid_t = typename map_invalid<AN...>::type;
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template<class T, class Selector>
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struct map
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{
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typedef rxu::decay_t<T> source_value_type;
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typedef rxu::decay_t<Selector> select_type;
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typedef decltype((*(select_type*)nullptr)(*(source_value_type*)nullptr)) value_type;
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select_type selector;
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map(select_type s)
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: selector(std::move(s))
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{
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}
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template<class Subscriber>
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struct map_observer
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{
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typedef map_observer<Subscriber> this_type;
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typedef decltype((*(select_type*)nullptr)(*(source_value_type*)nullptr)) value_type;
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typedef rxu::decay_t<Subscriber> dest_type;
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typedef observer<source_value_type, this_type> observer_type;
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dest_type dest;
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mutable select_type selector;
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map_observer(dest_type d, select_type s)
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: dest(std::move(d))
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, selector(std::move(s))
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{
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}
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template<class Value>
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void on_next(Value&& v) const {
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auto selected = on_exception(
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[&](){
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return this->selector(std::forward<Value>(v));},
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dest);
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if (selected.empty()) {
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return;
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}
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dest.on_next(std::move(selected.get()));
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}
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void on_error(rxu::error_ptr e) const {
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dest.on_error(e);
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}
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void on_completed() const {
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dest.on_completed();
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}
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static subscriber<source_value_type, observer_type> make(dest_type d, select_type s) {
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auto cs = d.get_subscription();
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return make_subscriber<source_value_type>(std::move(cs), observer_type(this_type(std::move(d), std::move(s))));
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}
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};
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template<class Subscriber>
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auto operator()(Subscriber dest) const
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-> decltype(map_observer<Subscriber>::make(std::move(dest), selector)) {
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return map_observer<Subscriber>::make(std::move(dest), selector);
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}
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};
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}
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/*! @copydoc rx-map.hpp
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*/
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template<class... AN>
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auto map(AN&&... an)
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-> operator_factory<map_tag, AN...> {
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return operator_factory<map_tag, AN...>(std::make_tuple(std::forward<AN>(an)...));
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}
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/*! @copydoc rx-map.hpp
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*/
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template<class... AN>
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auto transform(AN&&... an)
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-> operator_factory<map_tag, AN...> {
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return operator_factory<map_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<map_tag>
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{
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template<class Observable, class Selector,
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class Enabled = rxu::enable_if_all_true_type_t<
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is_observable<Observable>>,
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class ResolvedSelector = rxu::decay_t<Selector>,
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class SourceValue = rxu::value_type_t<Observable>,
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class Map = rxo::detail::map<SourceValue, ResolvedSelector>,
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class Value = rxu::value_type_t<Map>>
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static auto member(Observable&& o, Selector&& s)
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-> decltype(o.template lift<Value>(Map(std::forward<Selector>(s)))) {
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return o.template lift<Value>(Map(std::forward<Selector>(s)));
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}
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template<class... AN>
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static operators::detail::map_invalid_t<AN...> member(const AN...) {
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std::terminate();
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return {};
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static_assert(sizeof...(AN) == 10000, "map takes Selector");
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}
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};
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}
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#endif
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