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// Copyright 2019 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef V8_CRDTP_GLUE_H_
#define V8_CRDTP_GLUE_H_
#include <cassert>
#include <memory>
namespace v8_crdtp {
namespace glue {
// =============================================================================
// glue::detail::PtrMaybe, glue::detail::ValueMaybe, templates for optional
// pointers / values which are used in ../lib/Forward_h.template.
// =============================================================================
namespace detail {
template <typename T>
class PtrMaybe {
public:
PtrMaybe() = default;
PtrMaybe(std::unique_ptr<T> value) : value_(std::move(value)) {}
PtrMaybe(PtrMaybe&& other) noexcept : value_(std::move(other.value_)) {}
void operator=(std::unique_ptr<T> value) { value_ = std::move(value); }
T* fromJust() const {
assert(value_);
return value_.get();
}
T* fromMaybe(T* default_value) const {
return value_ ? value_.get() : default_value;
}
bool isJust() const { return value_ != nullptr; }
std::unique_ptr<T> takeJust() {
assert(value_);
return std::move(value_);
}
private:
std::unique_ptr<T> value_;
};
template <typename T>
class ValueMaybe {
public:
ValueMaybe() : is_just_(false), value_() {}
ValueMaybe(T value) : is_just_(true), value_(std::move(value)) {}
ValueMaybe(ValueMaybe&& other) noexcept
: is_just_(other.is_just_), value_(std::move(other.value_)) {}
void operator=(T value) {
value_ = value;
is_just_ = true;
}
const T& fromJust() const {
assert(is_just_);
return value_;
}
const T& fromMaybe(const T& default_value) const {
return is_just_ ? value_ : default_value;
}
bool isJust() const { return is_just_; }
T takeJust() {
assert(is_just_);
is_just_ = false;
return std::move(value_);
}
private:
bool is_just_;
T value_;
};
} // namespace detail
} // namespace glue
} // namespace v8_crdtp
#define PROTOCOL_DISALLOW_COPY(ClassName) \
private: \
ClassName(const ClassName&) = delete; \
ClassName& operator=(const ClassName&) = delete
#endif // V8_CRDTP_GLUE_H_
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