'v8::Value::ToNumber': was declared deprecated

问题

I'm trying to access a known object and get one of its properties as a Number

Unfortunately, the following code...

Isolate *isolate = args.GetIsolate();

Local<Object> opts = args[0]->ToObject();

Local<Number> mode = opts->Get(String::NewFromUtf8(isolate, "mode"))->ToNumber();

is giving the following warning:

warning C4996: 'v8::Value::ToNumber': was declared deprecated
....node-gyp\8.5.0\include\node\v8.h(9578): note: see declaration of 'v8::Value::ToNumber'

In the v8.h I noticed the comment on ToNumber: "Use maybe version". I've attempted to convert it to a Maybe but I've not yet been able to get any attempt to compile correctly. What is the correct approach to using Maybe and getting the Number object?

回答1:

Looks like the "Use maybe version" comment in the v8.h led me in the wrong direction. The deprecate notice seems to apply to the method-overload that is missing the isolate. If you pass the isolate...

->ToNumber(isolate);

it works without warning.

来源：https://stackoverflow.com/questions/46807777/v8valuetonumber-was-declared-deprecated