mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-30 16:22:00 +00:00
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 -*- */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
/* Equality operations. */
|
|
|
|
#ifndef js_Equality_h
|
|
#define js_Equality_h
|
|
|
|
#include "mozilla/FloatingPoint.h"
|
|
|
|
#include "jstypes.h" // JS_PUBLIC_API
|
|
|
|
#include "js/TypeDecls.h"
|
|
|
|
struct JS_PUBLIC_API JSContext;
|
|
|
|
namespace JS {
|
|
|
|
/**
|
|
* Store |v1 === v2| to |*equal| -- strict equality, which performs no
|
|
* conversions on |v1| or |v2| before comparing.
|
|
*
|
|
* This operation can fail only if an internal error occurs (e.g. OOM while
|
|
* linearizing a string value).
|
|
*/
|
|
extern JS_PUBLIC_API bool StrictlyEqual(JSContext* cx, JS::Handle<JS::Value> v1,
|
|
JS::Handle<JS::Value> v2, bool* equal);
|
|
|
|
/**
|
|
* Store |v1 == v2| to |*equal| -- loose equality, which may perform
|
|
* user-modifiable conversions on |v1| or |v2|.
|
|
*
|
|
* This operation can fail if a user-modifiable conversion fails *or* if an
|
|
* internal error occurs. (e.g. OOM while linearizing a string value).
|
|
*/
|
|
extern JS_PUBLIC_API bool LooselyEqual(JSContext* cx, JS::Handle<JS::Value> v1,
|
|
JS::Handle<JS::Value> v2, bool* equal);
|
|
|
|
/**
|
|
* Stores |SameValue(v1, v2)| to |*equal| -- using the SameValue operation
|
|
* defined in ECMAScript, initially exposed to script as |Object.is|. SameValue
|
|
* behaves identically to strict equality, except that it equates two NaN values
|
|
* and does not equate differently-signed zeroes. It performs no conversions on
|
|
* |v1| or |v2| before comparing.
|
|
*
|
|
* This operation can fail only if an internal error occurs (e.g. OOM while
|
|
* linearizing a string value).
|
|
*/
|
|
extern JS_PUBLIC_API bool SameValue(JSContext* cx, JS::Handle<JS::Value> v1,
|
|
JS::Handle<JS::Value> v2, bool* same);
|
|
|
|
/**
|
|
* Implements |SameValueZero(v1, v2)| for Number values |v1| and |v2|.
|
|
* SameValueZero equates NaNs, equal nonzero values, and zeroes without respect
|
|
* to their signs.
|
|
*/
|
|
static inline bool SameValueZero(double v1, double v2) {
|
|
return mozilla::EqualOrBothNaN(v1, v2);
|
|
}
|
|
|
|
} // namespace JS
|
|
|
|
#endif /* js_Equality_h */
|