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//
// Copyright (c) 2015 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
// Optional.h:
// Represents a type that may be invalid, similar to std::optional.
//
#ifndef COMMON_OPTIONAL_H_
#define COMMON_OPTIONAL_H_
template <class T>
struct Optional
{
Optional()
: mValid(false),
mValue(T())
{}
Optional(const T &valueIn) : mValid(true), mValue(valueIn) {}
Optional(const Optional &other)
: mValid(other.mValid),
mValue(other.mValue)
{}
Optional &operator=(const Optional &other)
{
this->mValid = other.mValid;
this->mValue = other.mValue;
return *this;
}
Optional &operator=(const T &value)
{
mValue = value;
mValid = true;
return *this;
}
Optional &operator=(T &&value)
{
mValue = std::move(value);
mValid = true;
return *this;
}
void reset()
{
mValid = false;
}
static Optional Invalid() { return Optional(); }
bool valid() const { return mValid; }
const T &value() const { return mValue; }
bool operator==(const Optional &other) const
{
return ((mValid == other.mValid) && (!mValid || (mValue == other.mValue)));
}
bool operator!=(const Optional &other) const
{
return !(*this == other);
}
private:
bool mValid;
T mValue;
};
#endif // COMMON_OPTIONAL_H_
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