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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_OPERATORS_RX_BUFFER_COUNT_HPP)
#define RXCPP_OPERATORS_RX_BUFFER_COUNT_HPP
#include "../rx-includes.hpp"
namespace rxcpp {
namespace operators {
namespace detail {
template<class T>
struct buffer_count
{
typedef typename std::decay<T>::type source_value_type;
struct buffer_count_values
{
buffer_count_values(int c, int s)
: count(c)
, skip(s)
{
}
int count;
int skip;
};
buffer_count_values initial;
buffer_count(int count, int skip)
: initial(count, skip)
{
}
template<class Subscriber>
struct buffer_count_observer : public buffer_count_values
{
typedef buffer_count_observer<Subscriber> this_type;
typedef std::vector<T> value_type;
typedef typename std::decay<Subscriber>::type dest_type;
typedef observer<value_type, this_type> observer_type;
dest_type dest;
mutable int cursor;
mutable std::deque<value_type> chunks;
buffer_count_observer(dest_type d, buffer_count_values v)
: buffer_count_values(v)
, dest(std::move(d))
, cursor(0)
{
}
void on_next(T v) const {
if (cursor++ % this->skip == 0) {
chunks.emplace_back();
}
for(auto& chunk : chunks) {
chunk.push_back(v);
}
while (!chunks.empty() && int(chunks.front().size()) == this->count) {
dest.on_next(std::move(chunks.front()));
chunks.pop_front();
}
}
void on_error(std::exception_ptr e) const {
dest.on_error(e);
}
void on_completed() const {
auto done = on_exception(
[&](){
while (!chunks.empty()) {
dest.on_next(std::move(chunks.front()));
chunks.pop_front();
}
return true;
},
dest);
if (done.empty()) {
return;
}
dest.on_completed();
}
static subscriber<T, observer<T, this_type>> make(dest_type d, buffer_count_values v) {
auto cs = d.get_subscription();
return make_subscriber<T>(std::move(cs), this_type(std::move(d), std::move(v)));
}
};
template<class Subscriber>
auto operator()(Subscriber dest) const
-> decltype(buffer_count_observer<Subscriber>::make(std::move(dest), initial)) {
return buffer_count_observer<Subscriber>::make(std::move(dest), initial);
}
};
class buffer_count_factory
{
int count;
int skip;
public:
buffer_count_factory(int c, int s) : count(c), skip(s) {}
template<class Observable>
auto operator()(Observable&& source)
-> decltype(source.template lift<std::vector<typename std::decay<Observable>::type::value_type>>(buffer_count<typename std::decay<Observable>::type::value_type>(count, skip))) {
return source.template lift<std::vector<typename std::decay<Observable>::type::value_type>>(buffer_count<typename std::decay<Observable>::type::value_type>(count, skip));
}
};
}
inline auto buffer(int count)
-> detail::buffer_count_factory {
return detail::buffer_count_factory(count, count);
}
inline auto buffer(int count, int skip)
-> detail::buffer_count_factory {
return detail::buffer_count_factory(count, skip);
}
}
}
#endif
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