d5055bc932
This roll includes one change: "[inspector_protocol] support fall through and moveable Maybe" [1]. [1] https://codereview.chromium.org/2468923002/ BUG=none R=dgozman@chromium.org Review-Url: https://codereview.chromium.org/2469063002 Cr-Commit-Position: refs/heads/master@{#40687}
87 lines
2.6 KiB
Plaintext
87 lines
2.6 KiB
Plaintext
// Copyright 2016 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 {{"_".join(config.protocol.namespace)}}_Maybe_h
|
|
#define {{"_".join(config.protocol.namespace)}}_Maybe_h
|
|
|
|
//#include "Forward.h"
|
|
|
|
{% for namespace in config.protocol.namespace %}
|
|
namespace {{namespace}} {
|
|
{% endfor %}
|
|
|
|
template<typename T>
|
|
class Maybe {
|
|
public:
|
|
Maybe() : m_value() { }
|
|
Maybe(std::unique_ptr<T> value) : m_value(std::move(value)) { }
|
|
Maybe(Maybe&& other) : m_value(std::move(other.m_value)) { }
|
|
void operator=(std::unique_ptr<T> value) { m_value = std::move(value); }
|
|
T* fromJust() const { DCHECK(m_value); return m_value.get(); }
|
|
T* fromMaybe(T* defaultValue) const { return m_value ? m_value.get() : defaultValue; }
|
|
bool isJust() const { return !!m_value; }
|
|
std::unique_ptr<T> takeJust() { DCHECK(m_value); return m_value.release(); }
|
|
private:
|
|
std::unique_ptr<T> m_value;
|
|
};
|
|
|
|
template<typename T>
|
|
class MaybeBase {
|
|
public:
|
|
MaybeBase() : m_isJust(false) { }
|
|
MaybeBase(T value) : m_isJust(true), m_value(value) { }
|
|
MaybeBase(MaybeBase&& other) : m_isJust(other.m_isJust), m_value(std::move(other.m_value)) { }
|
|
void operator=(T value) { m_value = value; m_isJust = true; }
|
|
T fromJust() const { DCHECK(m_isJust); return m_value; }
|
|
T fromMaybe(const T& defaultValue) const { return m_isJust ? m_value : defaultValue; }
|
|
bool isJust() const { return m_isJust; }
|
|
T takeJust() { DCHECK(m_isJust); return m_value; }
|
|
|
|
protected:
|
|
bool m_isJust;
|
|
T m_value;
|
|
};
|
|
|
|
template<>
|
|
class Maybe<bool> : public MaybeBase<bool> {
|
|
public:
|
|
Maybe() { }
|
|
Maybe(bool value) : MaybeBase(value) { }
|
|
Maybe(Maybe&& other) : MaybeBase(std::move(other)) { }
|
|
using MaybeBase::operator=;
|
|
};
|
|
|
|
template<>
|
|
class Maybe<int> : public MaybeBase<int> {
|
|
public:
|
|
Maybe() { }
|
|
Maybe(int value) : MaybeBase(value) { }
|
|
Maybe(Maybe&& other) : MaybeBase(std::move(other)) { }
|
|
using MaybeBase::operator=;
|
|
};
|
|
|
|
template<>
|
|
class Maybe<double> : public MaybeBase<double> {
|
|
public:
|
|
Maybe() { }
|
|
Maybe(double value) : MaybeBase(value) { }
|
|
Maybe(Maybe&& other) : MaybeBase(std::move(other)) { }
|
|
using MaybeBase::operator=;
|
|
};
|
|
|
|
template<>
|
|
class Maybe<String> : public MaybeBase<String> {
|
|
public:
|
|
Maybe() { }
|
|
Maybe(const String& value) : MaybeBase(value) { }
|
|
Maybe(Maybe&& other) : MaybeBase(std::move(other)) { }
|
|
using MaybeBase::operator=;
|
|
};
|
|
|
|
{% for namespace in config.protocol.namespace %}
|
|
} // namespace {{namespace}}
|
|
{% endfor %}
|
|
|
|
#endif // !defined({{"_".join(config.protocol.namespace)}}_Maybe_h)
|