本文整理汇总了C++中js::Handle::isNullOrUndefined方法的典型用法代码示例。如果您正苦于以下问题：C++ Handle::isNullOrUndefined方法的具体用法？C++ Handle::isNullOrUndefined怎么用？C++ Handle::isNullOrUndefined使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类js::Handle的用法示例。
在下文中一共展示了Handle::isNullOrUndefined方法的3个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: obj
// static
nsresult
IDBKeyRange::FromJSVal(JSContext* aCx,
JS::Handle<JS::Value> aVal,
IDBKeyRange** aKeyRange)
{
nsRefPtr<IDBKeyRange> keyRange;
if (aVal.isNullOrUndefined()) {
// undefined and null returns no IDBKeyRange.
keyRange.forget(aKeyRange);
return NS_OK;
}
JS::Rooted<JSObject*> obj(aCx, aVal.isObject() ? &aVal.toObject() : nullptr);
if (aVal.isPrimitive() || JS_IsArrayObject(aCx, obj) ||
JS_ObjectIsDate(aCx, obj)) {
// A valid key returns an 'only' IDBKeyRange.
keyRange = new IDBKeyRange(nullptr, false, false, true);
nsresult rv = GetKeyFromJSVal(aCx, aVal, keyRange->Lower());
if (NS_FAILED(rv)) {
return rv;
}
}
else {
MOZ_ASSERT(aVal.isObject());
// An object is not permitted unless it's another IDBKeyRange.
if (NS_FAILED(UNWRAP_OBJECT(IDBKeyRange, obj, keyRange))) {
return NS_ERROR_DOM_INDEXEDDB_DATA_ERR;
}
}
keyRange.forget(aKeyRange);
return NS_OK;
}示例2: obj
// static
nsresult
IDBKeyRange::FromJSVal(JSContext* aCx,
JS::Handle<JS::Value> aVal,
IDBKeyRange** aKeyRange)
{
MOZ_ASSERT_IF(!aCx, aVal.isUndefined());
RefPtr<IDBKeyRange> keyRange;
if (aVal.isNullOrUndefined()) {
// undefined and null returns no IDBKeyRange.
keyRange.forget(aKeyRange);
return NS_OK;
}
JS::Rooted<JSObject*> obj(aCx, aVal.isObject() ? &aVal.toObject() : nullptr);
bool isValidKey = aVal.isPrimitive();
if (!isValidKey) {
js::ESClass cls;
if (!js::GetBuiltinClass(aCx, obj, &cls)) {
return NS_ERROR_UNEXPECTED;
}
isValidKey = cls == js::ESClass::Array || cls == js::ESClass::Date;
}
if (isValidKey) {
// A valid key returns an 'only' IDBKeyRange.
keyRange = new IDBKeyRange(nullptr, false, false, true);
nsresult rv = GetKeyFromJSVal(aCx, aVal, keyRange->Lower());
if (NS_FAILED(rv)) {
return rv;
}
}
else {
MOZ_ASSERT(aVal.isObject());
// An object is not permitted unless it's another IDBKeyRange.
if (NS_FAILED(UNWRAP_OBJECT(IDBKeyRange, obj, keyRange))) {
return NS_ERROR_DOM_INDEXEDDB_DATA_ERR;
}
}
keyRange.forget(aKeyRange);
return NS_OK;
}示例3: GenerateWarning
NS_IMETHODIMP
WebGLContext::SetContextOptions(JSContext* aCx, JS::Handle<JS::Value> aOptions)
{
if (aOptions.isNullOrUndefined() && mOptionsFrozen) {
return NS_OK;
}
WebGLContextAttributes attributes;
NS_ENSURE_TRUE(attributes.Init(aCx, aOptions), NS_ERROR_UNEXPECTED);
WebGLContextOptions newOpts;
newOpts.stencil = attributes.mStencil;
newOpts.depth = attributes.mDepth;
newOpts.premultipliedAlpha = attributes.mPremultipliedAlpha;
newOpts.antialias = attributes.mAntialias;
newOpts.preserveDrawingBuffer = attributes.mPreserveDrawingBuffer;
if (attributes.mAlpha.WasPassed()) {
newOpts.alpha = attributes.mAlpha.Value();
}
// enforce that if stencil is specified, we also give back depth
newOpts.depth |= newOpts.stencil;
#if 0
GenerateWarning("aaHint: %d stencil: %d depth: %d alpha: %d premult: %d preserve: %d\n",
newOpts.antialias ? 1 : 0,
newOpts.stencil ? 1 : 0,
newOpts.depth ? 1 : 0,
newOpts.alpha ? 1 : 0,
newOpts.premultipliedAlpha ? 1 : 0,
newOpts.preserveDrawingBuffer ? 1 : 0);
#endif
if (mOptionsFrozen && newOpts != mOptions) {
// Error if the options are already frozen, and the ones that were asked for
// aren't the same as what they were originally.
return NS_ERROR_FAILURE;
}
mOptions = newOpts;
return NS_OK;
}