JS::AutoSaveExceptionState

This article covers features introduced in SpiderMonkey 31

Save and later restore the current exception state of a given JSContext.

JS::AutoSaveExceptionState(JSContext *cx);

Name	Type	Description
`cx`	`JSContext *`	Pointer to a JS context from which to derive runtime information. Requires request. In a `JS_THREADSAFE` build, the caller must be in a request on this `JSContext`.

JS::AutoSaveExceptionState saves and later restores the current exception state of a given JSContext.

This is useful for implementing behavior in C++ that's like try/catch or try/finally in JS.

// Typical usage:
bool ok = JS::Evaluate(cx, ...);
AutoSaveExceptionState savedExc(cx);
... cleanup that might re-enter JS ...
return ok;