50ec35575f
Summary:
@public
`YGFloatOptional::getValue()` has the unfortunate property of calling `std::exit` if the wrapped value is undefined.
That forces `x.isUndefined() ? fallback : x.getValue()` as access pattern.
Here, we replace that by introducing `YGFloatOptional::orElse(float)` which encapsulates that pattern. Other additions are `orElseGet([] { … })` and some extra operators.
Reviewed By: SidharthGuglani
Differential Revision: D13209152
fbshipit-source-id: 4e5deceaaaaf8eaed44846a8c152cc8b235e815c
51 lines
1.3 KiB
C++
51 lines
1.3 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 LICENSE
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* file in the root directory of this source tree.
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*/
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#pragma once
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#include <limits>
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struct YGFloatOptional {
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private:
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float value_ = std::numeric_limits<float>::quiet_NaN();
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public:
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explicit constexpr YGFloatOptional(float 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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float unwrap() const {
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return value_;
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}
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constexpr bool isUndefined() const {
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// std::isnan is not constexpr
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return !(value_ == value_);
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}
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constexpr float orElse(float other) const {
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return isUndefined() ? other : value_;
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}
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template <typename Factory>
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constexpr float orElseGet(Factory&& f) const {
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return isUndefined() ? f() : value_;
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}
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YGFloatOptional operator-() const;
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YGFloatOptional operator+(YGFloatOptional op) const;
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YGFloatOptional operator-(YGFloatOptional op) const;
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bool operator>(YGFloatOptional op) const;
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bool operator<(YGFloatOptional op) const;
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bool operator>=(YGFloatOptional op) const;
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bool operator<=(YGFloatOptional op) const;
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bool operator==(YGFloatOptional op) const;
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bool operator!=(YGFloatOptional op) const;
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bool operator==(float val) const;
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bool operator!=(float val) const;
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};
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