f3eade2f62
Drop the AGPL license in favor of a source-available license. See the blog post [1] for details. [1] https://www.scylladb.com/2024/12/18/why-were-moving-to-a-source-available-license/
137 lines
3.2 KiB
C++
137 lines
3.2 KiB
C++
#pragma once
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/*
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* Copyright (C) 2024-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: LicenseRef-ScyllaDB-Source-Available-1.0
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*/
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#include <fmt/format.h>
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#include <seastar/util/bool_class.hh>
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#include <seastar/core/sstring.hh>
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#include "enum_set.hh"
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using namespace seastar;
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namespace utils {
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enum class optional_param_flag {
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user_provided,
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force
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};
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using optional_param_flags_set = enum_set<super_enum<optional_param_flag,
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optional_param_flag::user_provided,
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optional_param_flag::force
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>>;
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template <class T = sstring>
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class optional_param_base {
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public:
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using value_type = T;
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using flag = optional_param_flag;
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using flags_set = optional_param_flags_set;
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std::optional<T> _value;
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// or implicitly provided as default by scylla
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flags_set _flags;
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public:
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optional_param_base() = default;
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explicit optional_param_base(sstring value, flags_set opts = {}) noexcept
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: _value(std::move(value))
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, _flags(opts)
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{}
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template <typename... Args>
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optional_param_base& emplace(Args... args) {
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_value.emplace(std::forward<Args>(args)...);
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return *this;
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}
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constexpr explicit operator bool() const noexcept {
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return has_value();
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}
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constexpr const T* operator->() const noexcept {
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return &_value;
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}
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constexpr const T& operator*() const noexcept {
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return *_value;
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}
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constexpr bool has_value() const noexcept {
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return _value.has_value();
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}
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constexpr const T& value() const noexcept {
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return _value.value();
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}
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constexpr T value_or(T&& default_value) const noexcept {
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return _value.value_or(std::forward<T>(default_value));
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}
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flags_set flags() const noexcept {
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return _flags;
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}
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constexpr bool user_provided() const noexcept {
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return _flags.contains(flag::user_provided);
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}
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optional_param_base& set_user_provided(bool value = true) noexcept {
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if (value) {
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_flags.set(flag::user_provided);
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} else {
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_flags.remove(flag::user_provided);
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}
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return *this;
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}
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constexpr bool force() const noexcept {
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return _flags.contains(flag::force);
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}
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optional_param_base& set_force(bool value = true) {
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if (value) {
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_flags.set(flag::force);
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} else {
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_flags.remove(flag::force);
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}
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return *this;
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}
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void reset() noexcept {
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_value.reset();
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_flags = {};
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}
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};
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using optional_param = optional_param_base<sstring>;
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} //namespace utils
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template<>
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struct fmt::formatter<utils::optional_param_flags_set> : fmt::formatter<string_view> {
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auto format(const utils::optional_param_flags_set& flags, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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template<class T>
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struct fmt::formatter<utils::optional_param_base<T>> : fmt::formatter<string_view> {
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auto format(const utils::optional_param_base<T>& p, fmt::format_context& ctx) const -> decltype(ctx.out()) {
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if (p) {
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return fmt::format_to(ctx.out(), "{} ({})", p.value(), p.flags());
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} else {
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return fmt::format_to(ctx.out(), "(none)");
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}
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}
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};
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