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/******************************************************************************
* ____ _ _____ *
* / ___| / \ | ___| C++ *
* | | / _ \ | |_ Actor *
* | |___ / ___ \| _| Framework *
* \____/_/ \_|_| *
* *
* Copyright 2011-2018 Dominik Charousset *
* *
* Distributed under the terms and conditions of the BSD 3-Clause License or *
* (at your option) under the terms and conditions of the Boost Software *
* License 1.0. See accompanying files LICENSE and LICENSE_ALTERNATIVE. *
* *
* If you did not receive a copy of the license files, see *
* http://opensource.org/licenses/BSD-3-Clause and *
* http://www.boost.org/LICENSE_1_0.txt. *
******************************************************************************/
#pragma once
#include <cstdint>
#include <unordered_map>
#include "caf/atom.hpp"
#include "caf/detail/shared_spinlock.hpp"
#include "caf/variant.hpp"
namespace caf {
/// Thread-safe container for mapping atoms to arbitrary settings.
class runtime_settings_map {
public:
// -- member types -----------------------------------------------------------
using mutex_type = detail::shared_spinlock;
using generic_pointer = void*;
using generic_function_pointer = void (*)();
using mapped_type = variant<none_t, int64_t, uint64_t, atom_value,
generic_pointer, generic_function_pointer>;
// -- thread-safe access -----------------------------------------------------
/// Returns the value mapped to `key`.
mapped_type get(atom_value key) const;
/// Returns the value mapped to `key` or `fallback` if no value is mapped to
/// this key.
mapped_type get_or(atom_value key, mapped_type fallback) const;
/// Maps `key` to `value` and returns the previous value.
void set(atom_value key, mapped_type value);
/// Removes `key` from the map.
void erase(atom_value key);
/// Returns the number of key-value entries.
size_t size() const;
/// Returns whether `size()` equals 0.
bool empty() const {
return size() == 0;
}
private:
// -- member variables -------------------------------------------------------
mutable mutex_type mtx_;
std::unordered_map<atom_value, mapped_type> map_;
};
} // namespace caf
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