9378a7a439
Summary:
@public
Adds `_pt` and `_percent` user defined literals to create `YGValue` instances.
This allows to create `YGValue`s in the following form:
```
use namespace facebook::yoga::literals;
auto a = 123_pt; // == YGValue{123.0f, YGUnitPoint}
auto b = -12.5_percent; // == YGValue{-12.5f, YGUnitPercent}
```
Reviewed By: SidharthGuglani
Differential Revision: D13942100
fbshipit-source-id: ce1e2f9431c3e2a99c6e11896a712539cc535e0d
84 lines
1.7 KiB
C++
84 lines
1.7 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 <math.h>
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#include "YGEnums.h"
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#include "YGMacros.h"
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YG_EXTERN_C_BEGIN
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// Not defined in MSVC++
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#ifndef NAN
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static const uint32_t __nan = 0x7fc00000;
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#define NAN (*(const float*) __nan)
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#endif
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#define YGUndefined NAN
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typedef struct YGValue {
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float value;
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YGUnit unit;
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} YGValue;
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extern const YGValue YGValueAuto;
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extern const YGValue YGValueUndefined;
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extern const YGValue YGValueZero;
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YG_EXTERN_C_END
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#ifdef __cplusplus
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inline bool operator==(const YGValue& lhs, const YGValue& rhs) {
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if (lhs.unit != rhs.unit) {
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return false;
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}
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switch (lhs.unit) {
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case YGUnitUndefined:
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case YGUnitAuto:
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return true;
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case YGUnitPoint:
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case YGUnitPercent:
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return lhs.value == rhs.value;
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}
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return false;
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}
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inline bool operator!=(const YGValue& lhs, const YGValue& rhs) {
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return !(lhs == rhs);
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}
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inline YGValue operator-(const YGValue& value) {
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return {-value.value, value.unit};
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}
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namespace facebook {
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namespace yoga {
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namespace literals {
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inline YGValue operator"" _pt(long double value) {
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return YGValue{static_cast<float>(value), YGUnitPoint};
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}
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inline YGValue operator"" _pt(unsigned long long value) {
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return operator"" _pt(static_cast<long double>(value));
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}
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inline YGValue operator"" _percent(long double value) {
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return YGValue{static_cast<float>(value), YGUnitPercent};
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}
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inline YGValue operator"" _percent(unsigned long long value) {
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return operator"" _percent(static_cast<long double>(value));
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}
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} // namespace literals
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} // namespace yoga
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} // namespace facebook
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#endif
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