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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /gfx/angle/src/common/Optional.h
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'gfx/angle/src/common/Optional.h')
-rwxr-xr-xgfx/angle/src/common/Optional.h74
1 files changed, 74 insertions, 0 deletions
diff --git a/gfx/angle/src/common/Optional.h b/gfx/angle/src/common/Optional.h
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+++ b/gfx/angle/src/common/Optional.h
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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_