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Summary: `SharedFunction` implements a pattern of a shared callable object that contains the same executable inside. It's similar to `std::function` with one important difference: when the object is copied, the stored function (and captured values) are shared between instances (not copied). `SharedFunction` can be stored inside `std::function` because it's callable. It useful in some scenarios, such as: * When captured by `std::function` arguments are not copyable; * When we need to replace the content of the callable later on the go. We will use it in the coming diffs. Reviewed By: mdvacca Differential Revision: D14072078 fbshipit-source-id: 9df4ad2d1b92394e2dfef5c283f35c7c0bd4b500
20 lines
474 B
C++
20 lines
474 B
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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namespace facebook {
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namespace react {
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inline bool floatEquality(float a, float b, float epsilon = 0.005f) {
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return (std::isnan(a) && std::isnan(b)) ||
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(!std::isnan(a) && !std::isnan(b) && fabs(a - b) < epsilon);
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}
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} // namespace react
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} // namespace facebook
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