audio_system_aggregate.hpp

// Copyright Take Vos 2020, 2022.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#include "audio_system.hpp"
#include "../algorithm.hpp"
#include <algorithm>
 
namespace hi::inline v1 {
 
class audio_system_aggregate : public audio_system {
public:
    using super = audio_system;
 
    audio_system_aggregate() = default;
    virtual ~audio_system_aggregate() {}
 
    [[nodiscard]] generator<audio_device &> devices() noexcept override
    {
        for (auto &child : _children) {
            for (auto &device: child.system->devices()) {
                co_yield device;
            }
        }
    }
 
    void add_child(std::unique_ptr<audio_system> new_child)
    {
        auto new_cbt = new_child->subscribe([this] {
            _notifier();
        });
 
        _children.emplace_back(std::move(new_child), std::move(new_cbt));
    }
 
private:
    struct child_type {
        std::unique_ptr<audio_system> system;
        audio_system::callback_token cbt;
    };
 
    std::vector<child_type> _children;
};
 
} // namespace hi::inline v1