71 lines
1.9 KiB
C++
71 lines
1.9 KiB
C++
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <cmath>
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#include <limits>
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#include "Yoga-internal.h"
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struct YGFloatOptional {
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private:
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double value_ = std::numeric_limits<double>::quiet_NaN();
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public:
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explicit constexpr YGFloatOptional(double value) : value_(value) {}
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constexpr YGFloatOptional() = default;
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// returns the wrapped value, or a value x with YGIsUndefined(x) == true
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constexpr double unwrap() const { return value_; }
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bool isUndefined() const { return std::isnan(value_); }
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};
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// operators take YGFloatOptional by value, as it is a 32bit value
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inline bool operator==(YGFloatOptional lhs, YGFloatOptional rhs) {
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return lhs.unwrap() == rhs.unwrap() ||
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(lhs.isUndefined() && rhs.isUndefined());
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}
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inline bool operator!=(YGFloatOptional lhs, YGFloatOptional rhs) {
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return !(lhs == rhs);
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}
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inline bool operator==(YGFloatOptional lhs, double rhs) {
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return lhs == YGFloatOptional{rhs};
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}
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inline bool operator!=(YGFloatOptional lhs, double rhs) {
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return !(lhs == rhs);
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}
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inline bool operator==(double lhs, YGFloatOptional rhs) {
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return rhs == lhs;
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}
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inline bool operator!=(double lhs, YGFloatOptional rhs) {
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return !(lhs == rhs);
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}
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inline YGFloatOptional operator+(YGFloatOptional lhs, YGFloatOptional rhs) {
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return YGFloatOptional{lhs.unwrap() + rhs.unwrap()};
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}
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inline bool operator>(YGFloatOptional lhs, YGFloatOptional rhs) {
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return lhs.unwrap() > rhs.unwrap();
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}
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inline bool operator<(YGFloatOptional lhs, YGFloatOptional rhs) {
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return lhs.unwrap() < rhs.unwrap();
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}
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inline bool operator>=(YGFloatOptional lhs, YGFloatOptional rhs) {
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return lhs > rhs || lhs == rhs;
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}
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inline bool operator<=(YGFloatOptional lhs, YGFloatOptional rhs) {
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return lhs < rhs || lhs == rhs;
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}
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