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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
#if !defined(RXCPP_RX_GROUPED_OBSERVABLE_HPP)
#define RXCPP_RX_GROUPED_OBSERVABLE_HPP
#include "rx-includes.hpp"
namespace rxcpp {
namespace detail {
template<class K, class Source>
struct has_on_get_key_for
{
struct not_void {};
template<class CS>
static auto check(int) -> decltype((*(CS*)nullptr).on_get_key());
template<class CS>
static not_void check(...);
typedef decltype(check<Source>(0)) detail_result;
static const bool value = std::is_same<detail_result, rxu::decay_t<K>>::value;
};
}
template<class K, class T>
class dynamic_grouped_observable
: public dynamic_observable<T>
{
public:
typedef rxu::decay_t<K> key_type;
typedef tag_dynamic_grouped_observable dynamic_observable_tag;
private:
struct state_type
: public std::enable_shared_from_this<state_type>
{
typedef std::function<key_type()> ongetkey_type;
ongetkey_type on_get_key;
};
std::shared_ptr<state_type> state;
template<class U, class V>
friend bool operator==(const dynamic_grouped_observable<U, V>&, const dynamic_grouped_observable<U, V>&);
template<class U, class V>
void construct(const dynamic_grouped_observable<U, V>& o, const tag_dynamic_grouped_observable&) {
state = o.state;
}
template<class U, class V>
void construct(dynamic_grouped_observable<U, V>&& o, const tag_dynamic_grouped_observable&) {
state = std::move(o.state);
}
template<class SO>
void construct(SO&& source, const rxs::tag_source&) {
auto so = std::make_shared<rxu::decay_t<SO>>(std::forward<SO>(source));
state->on_get_key = [so]() mutable {
return so->on_get_key();
};
}
public:
dynamic_grouped_observable()
{
}
template<class SOF>
explicit dynamic_grouped_observable(SOF sof)
: dynamic_observable<T>(sof)
, state(std::make_shared<state_type>())
{
construct(std::move(sof),
typename std::conditional<is_dynamic_grouped_observable<SOF>::value, tag_dynamic_grouped_observable, rxs::tag_source>::type());
}
template<class SF, class CF>
dynamic_grouped_observable(SF&& sf, CF&& cf)
: dynamic_observable<T>(std::forward<SF>(sf))
, state(std::make_shared<state_type>())
{
state->on_connect = std::forward<CF>(cf);
}
using dynamic_observable<T>::on_subscribe;
key_type on_get_key() const {
return state->on_get_key();
}
};
template<class K, class T>
inline bool operator==(const dynamic_grouped_observable<K, T>& lhs, const dynamic_grouped_observable<K, T>& rhs) {
return lhs.state == rhs.state;
}
template<class K, class T>
inline bool operator!=(const dynamic_grouped_observable<K, T>& lhs, const dynamic_grouped_observable<K, T>& rhs) {
return !(lhs == rhs);
}
template<class K, class T, class Source>
grouped_observable<K, T> make_dynamic_grouped_observable(Source&& s) {
return grouped_observable<K, T>(dynamic_grouped_observable<K, T>(std::forward<Source>(s)));
}
/*!
\brief a source of observables which each emit values from one category specified by the key selector.
\ingroup group-observable
*/
template<class K, class T, class SourceOperator>
class grouped_observable
: public observable<T, SourceOperator>
{
typedef grouped_observable<K, T, SourceOperator> this_type;
typedef observable<T, SourceOperator> base_type;
typedef rxu::decay_t<SourceOperator> source_operator_type;
static_assert(detail::has_on_get_key_for<K, source_operator_type>::value, "inner must have on_get_key method key_type()");
public:
typedef rxu::decay_t<K> key_type;
typedef tag_grouped_observable observable_tag;
grouped_observable()
{
}
explicit grouped_observable(const SourceOperator& o)
: base_type(o)
{
}
explicit grouped_observable(SourceOperator&& o)
: base_type(std::move(o))
{
}
// implicit conversion between observables of the same value_type
template<class SO>
grouped_observable(const grouped_observable<K, T, SO>& o)
: base_type(o)
{}
// implicit conversion between observables of the same value_type
template<class SO>
grouped_observable(grouped_observable<K, T, SO>&& o)
: base_type(std::move(o))
{}
///
/// performs type-forgetting conversion to a new grouped_observable
///
grouped_observable<K, T> as_dynamic() const {
return *this;
}
key_type get_key() const {
return base_type::source_operator.on_get_key();
}
};
}
//
// support range() >> filter() >> subscribe() syntax
// '>>' is spelled 'stream'
//
template<class K, class T, class SourceOperator, class OperatorFactory>
auto operator >> (const rxcpp::grouped_observable<K, T, SourceOperator>& source, OperatorFactory&& of)
-> decltype(source.op(std::forward<OperatorFactory>(of))) {
return source.op(std::forward<OperatorFactory>(of));
}
//
// support range() | filter() | subscribe() syntax
// '|' is spelled 'pipe'
//
template<class K, class T, class SourceOperator, class OperatorFactory>
auto operator | (const rxcpp::grouped_observable<K, T, SourceOperator>& source, OperatorFactory&& of)
-> decltype(source.op(std::forward<OperatorFactory>(of))) {
return source.op(std::forward<OperatorFactory>(of));
}
#endif
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