serge-sans-paille
ae7a934674
Fallback to spaceship operator when it makes sense. Also default inequality operator when it depends on defaulted equality operator. All cases spotted through the analysis from Bug 2064388. Differential Revision: https://phabricator.services.mozilla.com/D319780
76 lines
2.1 KiB
C++
76 lines
2.1 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_MemoryPressureLevelMac_h
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#define mozilla_MemoryPressureLevelMac_h
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#ifdef XP_DARWIN
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# include "mozilla/Attributes.h"
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namespace mozilla {
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// An internal representation of the Mac memory-pressure level constants.
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class MacMemoryPressureLevel {
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public:
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// Order enum values so that higher integer values represent higher
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// memory pressure levels allowing comparison operators to be used.
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enum class Value {
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eUnset,
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eUnexpected,
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eNormal,
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eWarning,
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eCritical,
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};
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MacMemoryPressureLevel() : mValue(Value::eUnset) {}
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MOZ_IMPLICIT MacMemoryPressureLevel(Value aValue) : mValue(aValue) {}
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bool operator==(const Value& aRhsValue) const { return mValue == aRhsValue; }
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bool operator==(const MacMemoryPressureLevel& aRhs) const = default;
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// Implement '<' and derive the other comparators from it.
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bool operator<(const MacMemoryPressureLevel& aRhs) const {
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return mValue < aRhs.mValue;
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}
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bool operator>(const MacMemoryPressureLevel& aRhs) const {
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return aRhs < *this;
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}
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bool operator<=(const MacMemoryPressureLevel& aRhs) const {
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return !(aRhs < *this);
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}
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bool operator>=(const MacMemoryPressureLevel& aRhs) const {
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return !(*this < aRhs);
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}
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Value GetValue() { return mValue; }
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bool IsNormal() { return mValue == Value::eNormal; }
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bool IsUnsetOrNormal() { return IsNormal() || (mValue == Value::eUnset); }
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bool IsWarningOrAbove() {
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return (mValue == Value::eWarning) || (mValue == Value::eCritical);
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}
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const char* ToString() {
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switch (mValue) {
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case Value::eUnset:
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return "Unset";
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case Value::eUnexpected:
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return "Unexpected";
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case Value::eNormal:
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return "Normal";
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case Value::eWarning:
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return "Warning";
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case Value::eCritical:
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return "Critical";
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}
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}
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private:
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Value mValue;
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};
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} // namespace mozilla
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#endif
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#endif // mozilla_MemoryPressureLevelMac_h
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