1 | ## Converters
|
2 |
|
3 | NAN contains functions that convert `v8::Value`s to other `v8::Value` types and native types. Since type conversion is not guaranteed to succeed, they return `Nan::Maybe` types. These converters can be used in place of `value->ToX()` and `value->XValue()` (where `X` is one of the types, e.g. `Boolean`) in a way that provides a consistent interface across V8 versions. Newer versions of V8 use the new `v8::Maybe` and `v8::MaybeLocal` types for these conversions, older versions don't have this functionality so it is provided by NAN.
|
4 |
|
5 | - <a href="#api_nan_to"><b><code>Nan::To()</code></b></a>
|
6 |
|
7 | <a name="api_nan_to"></a>
|
8 | ### Nan::To()
|
9 |
|
10 | Converts a `v8::Local<v8::Value>` to a different subtype of `v8::Value` or to a native data type. Returns a `Nan::MaybeLocal<>` or a `Nan::Maybe<>` accordingly.
|
11 |
|
12 | See [maybe_types.md](./maybe_types.md) for more information on `Nan::Maybe` types.
|
13 |
|
14 | Signatures:
|
15 |
|
16 | ```c++
|
17 | // V8 types
|
18 | Nan::MaybeLocal<v8::Boolean> Nan::To<v8::Boolean>(v8::Local<v8::Value> val);
|
19 | Nan::MaybeLocal<v8::Int32> Nan::To<v8::Int32>(v8::Local<v8::Value> val);
|
20 | Nan::MaybeLocal<v8::Integer> Nan::To<v8::Integer>(v8::Local<v8::Value> val);
|
21 | Nan::MaybeLocal<v8::Object> Nan::To<v8::Object>(v8::Local<v8::Value> val);
|
22 | Nan::MaybeLocal<v8::Number> Nan::To<v8::Number>(v8::Local<v8::Value> val);
|
23 | Nan::MaybeLocal<v8::String> Nan::To<v8::String>(v8::Local<v8::Value> val);
|
24 | Nan::MaybeLocal<v8::Uint32> Nan::To<v8::Uint32>(v8::Local<v8::Value> val);
|
25 |
|
26 | // Native types
|
27 | Nan::Maybe<bool> Nan::To<bool>(v8::Local<v8::Value> val);
|
28 | Nan::Maybe<double> Nan::To<double>(v8::Local<v8::Value> val);
|
29 | Nan::Maybe<int32_t> Nan::To<int32_t>(v8::Local<v8::Value> val);
|
30 | Nan::Maybe<int64_t> Nan::To<int64_t>(v8::Local<v8::Value> val);
|
31 | Nan::Maybe<uint32_t> Nan::To<uint32_t>(v8::Local<v8::Value> val);
|
32 | ```
|
33 |
|
34 | ### Example
|
35 |
|
36 | ```c++
|
37 | v8::Local<v8::Value> val;
|
38 | Nan::MaybeLocal<v8::String> str = Nan::To<v8::String>(val);
|
39 | Nan::Maybe<double> d = Nan::To<double>(val);
|
40 | ```
|
41 |
|