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66 lines
2.2 KiB
C++
66 lines
2.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* 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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/* Equality operations. */
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#ifndef js_Equality_h
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#define js_Equality_h
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#include "mozilla/FloatingPoint.h"
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#include "jstypes.h" // JS_PUBLIC_API
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#include "js/TypeDecls.h"
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struct JS_PUBLIC_API JSContext;
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namespace JS {
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/**
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* Store |v1 === v2| to |*equal| -- strict equality, which performs no
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* conversions on |v1| or |v2| before comparing.
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*
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* This operation can fail only if an internal error occurs (e.g. OOM while
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* linearizing a string value).
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*/
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extern JS_PUBLIC_API bool StrictlyEqual(JSContext* cx, JS::Handle<JS::Value> v1,
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JS::Handle<JS::Value> v2, bool* equal);
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/**
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* Store |v1 == v2| to |*equal| -- loose equality, which may perform
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* user-modifiable conversions on |v1| or |v2|.
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*
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* This operation can fail if a user-modifiable conversion fails *or* if an
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* internal error occurs. (e.g. OOM while linearizing a string value).
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*/
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extern JS_PUBLIC_API bool LooselyEqual(JSContext* cx, JS::Handle<JS::Value> v1,
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JS::Handle<JS::Value> v2, bool* equal);
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/**
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* Stores |SameValue(v1, v2)| to |*equal| -- using the SameValue operation
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* defined in ECMAScript, initially exposed to script as |Object.is|. SameValue
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* behaves identically to strict equality, except that it equates two NaN values
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* and does not equate differently-signed zeroes. It performs no conversions on
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* |v1| or |v2| before comparing.
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*
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* This operation can fail only if an internal error occurs (e.g. OOM while
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* linearizing a string value).
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*/
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extern JS_PUBLIC_API bool SameValue(JSContext* cx, JS::Handle<JS::Value> v1,
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JS::Handle<JS::Value> v2, bool* same);
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/**
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* Implements |SameValueZero(v1, v2)| for Number values |v1| and |v2|.
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* SameValueZero equates NaNs, equal nonzero values, and zeroes without respect
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* to their signs.
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*/
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static inline bool SameValueZero(double v1, double v2) {
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return mozilla::EqualOrBothNaN(v1, v2);
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}
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} // namespace JS
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#endif /* js_Equality_h */
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