本文整理汇总了C++中wrappermap::Ptr::value方法的典型用法代码示例。如果您正苦于以下问题：C++ Ptr::value方法的具体用法？C++ Ptr::value怎么用？C++ Ptr::value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wrappermap::Ptr的用法示例。
在下文中一共展示了Ptr::value方法的1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: wobj
// Given a cross-compartment wrapper |wobj|, update it to point to
// |newTarget|. This recomputes the wrapper with JS_WrapValue, and thus can be
// useful even if wrapper already points to newTarget.
// This operation crashes on failure rather than leaving the heap in an
// inconsistent state.
void
js::RemapWrapper(JSContext* cx, JSObject* wobjArg, JSObject* newTargetArg)
{
RootedObject wobj(cx, wobjArg);
RootedObject newTarget(cx, newTargetArg);
MOZ_ASSERT(wobj->is<CrossCompartmentWrapperObject>());
MOZ_ASSERT(!newTarget->is<CrossCompartmentWrapperObject>());
JSObject* origTarget = Wrapper::wrappedObject(wobj);
MOZ_ASSERT(origTarget);
Value origv = ObjectValue(*origTarget);
JSCompartment* wcompartment = wobj->compartment();
AutoDisableProxyCheck adpc(cx->runtime());
// If we're mapping to a different target (as opposed to just recomputing
// for the same target), we must not have an existing wrapper for the new
// target, otherwise this will break.
MOZ_ASSERT_IF(origTarget != newTarget,
!wcompartment->lookupWrapper(ObjectValue(*newTarget)));
// The old value should still be in the cross-compartment wrapper map, and
// the lookup should return wobj.
WrapperMap::Ptr p = wcompartment->lookupWrapper(origv);
MOZ_ASSERT(&p->value().unsafeGet()->toObject() == wobj);
wcompartment->removeWrapper(p);
// When we remove origv from the wrapper map, its wrapper, wobj, must
// immediately cease to be a cross-compartment wrapper. Nuke it.
NukeCrossCompartmentWrapper(cx, wobj);
// First, we wrap it in the new compartment. We try to use the existing
// wrapper, |wobj|, since it's been nuked anyway. The wrap() function has
// the choice to reuse |wobj| or not.
RootedObject tobj(cx, newTarget);
AutoCompartment ac(cx, wobj);
if (!wcompartment->wrap(cx, &tobj, wobj))
MOZ_CRASH();
// If wrap() reused |wobj|, it will have overwritten it and returned with
// |tobj == wobj|. Otherwise, |tobj| will point to a new wrapper and |wobj|
// will still be nuked. In the latter case, we replace |wobj| with the
// contents of the new wrapper in |tobj|.
if (tobj != wobj) {
// Now, because we need to maintain object identity, we do a brain
// transplant on the old object so that it contains the contents of the
// new one.
if (!JSObject::swap(cx, wobj, tobj))
MOZ_CRASH();
}
// Before swapping, this wrapper came out of wrap(), which enforces the
// invariant that the wrapper in the map points directly to the key.
MOZ_ASSERT(Wrapper::wrappedObject(wobj) == newTarget);
// Update the entry in the compartment's wrapper map to point to the old
// wrapper, which has now been updated (via reuse or swap).
MOZ_ASSERT(wobj->is<WrapperObject>());
if (!wcompartment->putWrapper(cx, CrossCompartmentKey(newTarget), ObjectValue(*wobj)))
MOZ_CRASH();
}