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Diffstat (limited to 'src/3rdparty/angle/src/common/Optional.h')
-rw-r--r-- | src/3rdparty/angle/src/common/Optional.h | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/src/3rdparty/angle/src/common/Optional.h b/src/3rdparty/angle/src/common/Optional.h new file mode 100644 index 0000000000..9665b7ddf6 --- /dev/null +++ b/src/3rdparty/angle/src/common/Optional.h @@ -0,0 +1,61 @@ +// +// 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()) + {} + + explicit 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; + } + + static Optional None() + { + 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_ |