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/*
* This source code is released into the public domain.
*/
module;
/*
* The configuration store. There should only be one of these.
*/
#include <coroutine>
#include <expected>
#include <string>
#include <map>
export module nihil.config:store;
import nihil;
import :option;
namespace nihil::config {
struct store final {
/*
* Get the global config store.
*/
[[nodiscard]] static auto get() -> store &;
/*
* Register a new value with the config store.
*/
[[nodiscard]] auto register_option(this store &, option *object)
-> std::expected<void, error>;
/*
* Remove a value from the config store.
*/
[[nodiscard]] auto unregister_option(this store &, option *object)
-> std::expected<void, error>;
/*
* Fetch an existing value in the config store.
*/
[[nodiscard]] auto fetch(this store const &, std::string_view name)
-> std::expected<option const *, error>;
[[nodiscard]] auto fetch(this store &, std::string_view name)
-> std::expected<option *, error>;
/*
* Fetch all values in the configuration store.
*/
[[nodiscard]] auto all(this store const &self)
-> nihil::generator<option const *>;
[[nodiscard]] auto all(this store &self)
-> nihil::generator<option *>;
// Not movable or copyable.
store(store const &) = delete;
store(store &&) = delete;
store& operator=(store const &) = delete;
store& operator=(store &&) = delete;
private:
store();
std::map<std::string_view, option *> m_options;
};
/*
* The public API.
*/
export auto get_option(std::string_view option_name)
-> std::expected<option *, error>;
} // namespace nihil::config
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