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edd537ca2f
PR-URL: https://github.com/nodejs/node/pull/45230 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
81 lines
2.2 KiB
C++
81 lines
2.2 KiB
C++
// Copyright 2019 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_CRDTP_GLUE_H_
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#define V8_CRDTP_GLUE_H_
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#include <cassert>
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#include <memory>
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namespace v8_crdtp {
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namespace glue {
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// =============================================================================
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// glue::detail::PtrMaybe, glue::detail::ValueMaybe, templates for optional
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// pointers / values which are used in ../lib/Forward_h.template.
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// =============================================================================
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namespace detail {
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template <typename T>
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class PtrMaybe {
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public:
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PtrMaybe() = default;
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PtrMaybe(std::unique_ptr<T> value) : value_(std::move(value)) {}
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PtrMaybe(PtrMaybe&& other) noexcept : value_(std::move(other.value_)) {}
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void operator=(std::unique_ptr<T> value) { value_ = std::move(value); }
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T* fromJust() const {
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assert(value_);
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return value_.get();
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}
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T* fromMaybe(T* default_value) const {
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return value_ ? value_.get() : default_value;
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}
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bool isJust() const { return value_ != nullptr; }
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std::unique_ptr<T> takeJust() {
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assert(value_);
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return std::move(value_);
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}
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private:
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std::unique_ptr<T> value_;
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};
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template <typename T>
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class ValueMaybe {
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public:
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ValueMaybe() : is_just_(false), value_() {}
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ValueMaybe(T value) : is_just_(true), value_(std::move(value)) {}
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ValueMaybe(ValueMaybe&& other) noexcept
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: is_just_(other.is_just_), value_(std::move(other.value_)) {}
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void operator=(T value) {
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value_ = value;
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is_just_ = true;
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}
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const T& fromJust() const {
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assert(is_just_);
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return value_;
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}
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const T& fromMaybe(const T& default_value) const {
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return is_just_ ? value_ : default_value;
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}
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bool isJust() const { return is_just_; }
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T takeJust() {
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assert(is_just_);
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is_just_ = false;
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return std::move(value_);
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}
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private:
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bool is_just_;
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T value_;
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};
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} // namespace detail
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} // namespace glue
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} // namespace v8_crdtp
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#define PROTOCOL_DISALLOW_COPY(ClassName) \
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private: \
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ClassName(const ClassName&) = delete; \
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ClassName& operator=(const ClassName&) = delete
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#endif // V8_CRDTP_GLUE_H_
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