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## JavaScript-accessible methods
A _template_ is a blueprint for JavaScript functions and objects in a context. You can use a template to wrap C++ functions and data structures within JavaScript objects so that they can be manipulated from JavaScript. See the V8 Embedders Guide section on [Templates](https://github.com/v8/v8/wiki/Embedder%27s-Guide#templates) for further information.
In order to expose functionality to JavaScript via a template, you must provide it to V8 in a form that it understands. Across the versions of V8 supported by NAN, JavaScript-accessible method signatures vary widely, NAN fully abstracts method declaration and provides you with an interface that is similar to the most recent V8 API but is backward-compatible with older versions that still use the now-deceased `v8::Argument` type.
* **Method argument types**
- <a href="#api_nan_function_callback_info"><b><code>Nan::FunctionCallbackInfo</code></b></a>
- <a href="#api_nan_property_callback_info"><b><code>Nan::PropertyCallbackInfo</code></b></a>
- <a href="#api_nan_return_value"><b><code>Nan::ReturnValue</code></b></a>
* **Method declarations**
- <a href="#api_nan_method"><b>Method declaration</b></a>
- <a href="#api_nan_getter"><b>Getter declaration</b></a>
- <a href="#api_nan_setter"><b>Setter declaration</b></a>
- <a href="#api_nan_property_getter"><b>Property getter declaration</b></a>
- <a href="#api_nan_property_setter"><b>Property setter declaration</b></a>
- <a href="#api_nan_property_enumerator"><b>Property enumerator declaration</b></a>
- <a href="#api_nan_property_deleter"><b>Property deleter declaration</b></a>
- <a href="#api_nan_property_query"><b>Property query declaration</b></a>
- <a href="#api_nan_index_getter"><b>Index getter declaration</b></a>
- <a href="#api_nan_index_setter"><b>Index setter declaration</b></a>
- <a href="#api_nan_index_enumerator"><b>Index enumerator declaration</b></a>
- <a href="#api_nan_index_deleter"><b>Index deleter declaration</b></a>
- <a href="#api_nan_index_query"><b>Index query declaration</b></a>
* Method and template helpers
- <a href="#api_nan_set_method"><b><code>Nan::SetMethod()</code></b></a>
- <a href="#api_nan_set_prototype_method"><b><code>Nan::SetPrototypeMethod()</code></b></a>
- <a href="#api_nan_set_accessor"><b><code>Nan::SetAccessor()</code></b></a>
- <a href="#api_nan_set_named_property_handler"><b><code>Nan::SetNamedPropertyHandler()</code></b></a>
- <a href="#api_nan_set_indexed_property_handler"><b><code>Nan::SetIndexedPropertyHandler()</code></b></a>
- <a href="#api_nan_set_template"><b><code>Nan::SetTemplate()</code></b></a>
- <a href="#api_nan_set_prototype_template"><b><code>Nan::SetPrototypeTemplate()</code></b></a>
- <a href="#api_nan_set_instance_template"><b><code>Nan::SetInstanceTemplate()</code></b></a>
- <a href="#api_nan_set_call_handler"><b><code>Nan::SetCallHandler()</code></b></a>
- <a href="#api_nan_set_call_as_function_handler"><b><code>Nan::SetCallAsFunctionHandler()</code></b></a>
<a name="api_nan_function_callback_info"></a>
### Nan::FunctionCallbackInfo
`Nan::FunctionCallbackInfo` should be used in place of [`v8::FunctionCallbackInfo`](https://v8docs.nodesource.com/node-8.16/dd/d0d/classv8_1_1_function_callback_info.html), even with older versions of Node where `v8::FunctionCallbackInfo` does not exist.
Definition:
```c++
template<typename T> class FunctionCallbackInfo {
public:
ReturnValue<T> GetReturnValue() const;
v8::Local<v8::Function> Callee(); // NOTE: Not available in NodeJS >= 10.0.0
v8::Local<v8::Value> Data();
v8::Local<v8::Object> Holder();
bool IsConstructCall();
int Length() const;
v8::Local<v8::Value> operator[](int i) const;
v8::Local<v8::Object> This() const;
v8::Isolate *GetIsolate() const;
};
```
See the [`v8::FunctionCallbackInfo`](https://v8docs.nodesource.com/node-8.16/dd/d0d/classv8_1_1_function_callback_info.html) documentation for usage details on these. See [`Nan::ReturnValue`](#api_nan_return_value) for further information on how to set a return value from methods.
**Note:** `FunctionCallbackInfo::Callee` is removed in Node.js after `10.0.0` because it is was deprecated in V8. Consider using `info.Data()` to pass any information you need.
<a name="api_nan_property_callback_info"></a>
### Nan::PropertyCallbackInfo
`Nan::PropertyCallbackInfo` should be used in place of [`v8::PropertyCallbackInfo`](https://v8docs.nodesource.com/node-8.16/d7/dc5/classv8_1_1_property_callback_info.html), even with older versions of Node where `v8::PropertyCallbackInfo` does not exist.
Definition:
```c++
template<typename T> class PropertyCallbackInfo : public PropertyCallbackInfoBase<T> {
public:
ReturnValue<T> GetReturnValue() const;
v8::Isolate* GetIsolate() const;
v8::Local<v8::Value> Data() const;
v8::Local<v8::Object> This() const;
v8::Local<v8::Object> Holder() const;
};
```
See the [`v8::PropertyCallbackInfo`](https://v8docs.nodesource.com/node-8.16/d7/dc5/classv8_1_1_property_callback_info.html) documentation for usage details on these. See [`Nan::ReturnValue`](#api_nan_return_value) for further information on how to set a return value from property accessor methods.
<a name="api_nan_return_value"></a>
### Nan::ReturnValue
`Nan::ReturnValue` is used in place of [`v8::ReturnValue`](https://v8docs.nodesource.com/node-8.16/da/da7/classv8_1_1_return_value.html) on both [`Nan::FunctionCallbackInfo`](#api_nan_function_callback_info) and [`Nan::PropertyCallbackInfo`](#api_nan_property_callback_info) as the return type of `GetReturnValue()`.
Example usage:
```c++
void EmptyArray(const Nan::FunctionCallbackInfo<v8::Value>& info) {
info.GetReturnValue().Set(Nan::New<v8::Array>());
}
```
Definition:
```c++
template<typename T> class ReturnValue {
public:
// Handle setters
template <typename S> void Set(const v8::Local<S> &handle);
template <typename S> void Set(const Nan::Global<S> &handle);
// Fast primitive setters
void Set(bool value);
void Set(double i);
void Set(int32_t i);
void Set(uint32_t i);
// Fast JS primitive setters
void SetNull();
void SetUndefined();
void SetEmptyString();
// Convenience getter for isolate
v8::Isolate *GetIsolate() const;
};
```
See the documentation on [`v8::ReturnValue`](https://v8docs.nodesource.com/node-8.16/da/da7/classv8_1_1_return_value.html) for further information on this.
<a name="api_nan_method"></a>
### Method declaration
JavaScript-accessible methods should be declared with the following signature to form a `Nan::FunctionCallback`:
```c++
typedef void(*FunctionCallback)(const FunctionCallbackInfo<v8::Value>&);
```
Example:
```c++
void MethodName(const Nan::FunctionCallbackInfo<v8::Value>& info) {
...
}
```
You do not need to declare a new `HandleScope` within a method as one is implicitly created for you.
**Example usage**
```c++
// .h:
class Foo : public Nan::ObjectWrap {
...
static void Bar(const Nan::FunctionCallbackInfo<v8::Value>& info);
static void Baz(const Nan::FunctionCallbackInfo<v8::Value>& info);
}
// .cc:
void Foo::Bar(const Nan::FunctionCallbackInfo<v8::Value>& info) {
...
}
void Foo::Baz(const Nan::FunctionCallbackInfo<v8::Value>& info) {
...
}
```
A helper macro `NAN_METHOD(methodname)` exists, compatible with NAN v1 method declarations.
**Example usage with `NAN_METHOD(methodname)`**
```c++
// .h:
class Foo : public Nan::ObjectWrap {
...
static NAN_METHOD(Bar);
static NAN_METHOD(Baz);
}
// .cc:
NAN_METHOD(Foo::Bar) {
...
}
NAN_METHOD(Foo::Baz) {
...
}
```
Use [`Nan::SetPrototypeMethod`](#api_nan_set_prototype_method) to attach a method to a JavaScript function prototype or [`Nan::SetMethod`](#api_nan_set_method) to attach a method directly on a JavaScript object.
<a name="api_nan_getter"></a>
### Getter declaration
JavaScript-accessible getters should be declared with the following signature to form a `Nan::GetterCallback`:
```c++
typedef void(*GetterCallback)(v8::Local<v8::String>,
const PropertyCallbackInfo<v8::Value>&);
```
Example:
```c++
void GetterName(v8::Local<v8::String> property,
const Nan::PropertyCallbackInfo<v8::Value>& info) {
...
}
```
You do not need to declare a new `HandleScope` within a getter as one is implicitly created for you.
A helper macro `NAN_GETTER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on [Accessors](https://developers.google.com/v8/embed#accesssors).
<a name="api_nan_setter"></a>
### Setter declaration
JavaScript-accessible setters should be declared with the following signature to form a <b><code>Nan::SetterCallback</code></b>:
```c++
typedef void(*SetterCallback)(v8::Local<v8::String>,
v8::Local<v8::Value>,
const PropertyCallbackInfo<void>&);
```
Example:
```c++
void SetterName(v8::Local<v8::String> property,
v8::Local<v8::Value> value,
const Nan::PropertyCallbackInfo<void>& info) {
...
}
```
You do not need to declare a new `HandleScope` within a setter as one is implicitly created for you.
A helper macro `NAN_SETTER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on [Accessors](https://developers.google.com/v8/embed#accesssors).
<a name="api_nan_property_getter"></a>
### Property getter declaration
JavaScript-accessible property getters should be declared with the following signature to form a <b><code>Nan::PropertyGetterCallback</code></b>:
```c++
typedef void(*PropertyGetterCallback)(v8::Local<v8::String>,
const PropertyCallbackInfo<v8::Value>&);
```
Example:
```c++
void PropertyGetterName(v8::Local<v8::String> property,
const Nan::PropertyCallbackInfo<v8::Value>& info) {
...
}
```
You do not need to declare a new `HandleScope` within a property getter as one is implicitly created for you.
A helper macro `NAN_PROPERTY_GETTER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_property_setter"></a>
### Property setter declaration
JavaScript-accessible property setters should be declared with the following signature to form a <b><code>Nan::PropertySetterCallback</code></b>:
```c++
typedef void(*PropertySetterCallback)(v8::Local<v8::String>,
v8::Local<v8::Value>,
const PropertyCallbackInfo<v8::Value>&);
```
Example:
```c++
void PropertySetterName(v8::Local<v8::String> property,
v8::Local<v8::Value> value,
const Nan::PropertyCallbackInfo<v8::Value>& info);
```
You do not need to declare a new `HandleScope` within a property setter as one is implicitly created for you.
A helper macro `NAN_PROPERTY_SETTER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_property_enumerator"></a>
### Property enumerator declaration
JavaScript-accessible property enumerators should be declared with the following signature to form a <b><code>Nan::PropertyEnumeratorCallback</code></b>:
```c++
typedef void(*PropertyEnumeratorCallback)(const PropertyCallbackInfo<v8::Array>&);
```
Example:
```c++
void PropertyEnumeratorName(const Nan::PropertyCallbackInfo<v8::Array>& info);
```
You do not need to declare a new `HandleScope` within a property enumerator as one is implicitly created for you.
A helper macro `NAN_PROPERTY_ENUMERATOR(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_property_deleter"></a>
### Property deleter declaration
JavaScript-accessible property deleters should be declared with the following signature to form a <b><code>Nan::PropertyDeleterCallback</code></b>:
```c++
typedef void(*PropertyDeleterCallback)(v8::Local<v8::String>,
const PropertyCallbackInfo<v8::Boolean>&);
```
Example:
```c++
void PropertyDeleterName(v8::Local<v8::String> property,
const Nan::PropertyCallbackInfo<v8::Boolean>& info);
```
You do not need to declare a new `HandleScope` within a property deleter as one is implicitly created for you.
A helper macro `NAN_PROPERTY_DELETER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_property_query"></a>
### Property query declaration
JavaScript-accessible property query methods should be declared with the following signature to form a <b><code>Nan::PropertyQueryCallback</code></b>:
```c++
typedef void(*PropertyQueryCallback)(v8::Local<v8::String>,
const PropertyCallbackInfo<v8::Integer>&);
```
Example:
```c++
void PropertyQueryName(v8::Local<v8::String> property,
const Nan::PropertyCallbackInfo<v8::Integer>& info);
```
You do not need to declare a new `HandleScope` within a property query method as one is implicitly created for you.
A helper macro `NAN_PROPERTY_QUERY(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on named property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_index_getter"></a>
### Index getter declaration
JavaScript-accessible index getter methods should be declared with the following signature to form a <b><code>Nan::IndexGetterCallback</code></b>:
```c++
typedef void(*IndexGetterCallback)(uint32_t,
const PropertyCallbackInfo<v8::Value>&);
```
Example:
```c++
void IndexGetterName(uint32_t index, const PropertyCallbackInfo<v8::Value>& info);
```
You do not need to declare a new `HandleScope` within a index getter as one is implicitly created for you.
A helper macro `NAN_INDEX_GETTER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_index_setter"></a>
### Index setter declaration
JavaScript-accessible index setter methods should be declared with the following signature to form a <b><code>Nan::IndexSetterCallback</code></b>:
```c++
typedef void(*IndexSetterCallback)(uint32_t,
v8::Local<v8::Value>,
const PropertyCallbackInfo<v8::Value>&);
```
Example:
```c++
void IndexSetterName(uint32_t index,
v8::Local<v8::Value> value,
const PropertyCallbackInfo<v8::Value>& info);
```
You do not need to declare a new `HandleScope` within a index setter as one is implicitly created for you.
A helper macro `NAN_INDEX_SETTER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_index_enumerator"></a>
### Index enumerator declaration
JavaScript-accessible index enumerator methods should be declared with the following signature to form a <b><code>Nan::IndexEnumeratorCallback</code></b>:
```c++
typedef void(*IndexEnumeratorCallback)(const PropertyCallbackInfo<v8::Array>&);
```
Example:
```c++
void IndexEnumeratorName(const PropertyCallbackInfo<v8::Array>& info);
```
You do not need to declare a new `HandleScope` within a index enumerator as one is implicitly created for you.
A helper macro `NAN_INDEX_ENUMERATOR(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_index_deleter"></a>
### Index deleter declaration
JavaScript-accessible index deleter methods should be declared with the following signature to form a <b><code>Nan::IndexDeleterCallback</code></b>:
```c++
typedef void(*IndexDeleterCallback)(uint32_t,
const PropertyCallbackInfo<v8::Boolean>&);
```
Example:
```c++
void IndexDeleterName(uint32_t index, const PropertyCallbackInfo<v8::Boolean>& info);
```
You do not need to declare a new `HandleScope` within a index deleter as one is implicitly created for you.
A helper macro `NAN_INDEX_DELETER(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_index_query"></a>
### Index query declaration
JavaScript-accessible index query methods should be declared with the following signature to form a <b><code>Nan::IndexQueryCallback</code></b>:
```c++
typedef void(*IndexQueryCallback)(uint32_t,
const PropertyCallbackInfo<v8::Integer>&);
```
Example:
```c++
void IndexQueryName(uint32_t index, const PropertyCallbackInfo<v8::Integer>& info);
```
You do not need to declare a new `HandleScope` within a index query method as one is implicitly created for you.
A helper macro `NAN_INDEX_QUERY(methodname)` exists, compatible with NAN v1 method declarations.
Also see the V8 Embedders Guide documentation on indexed property [Interceptors](https://developers.google.com/v8/embed#interceptors).
<a name="api_nan_set_method"></a>
### Nan::SetMethod()
Sets a method with a given name directly on a JavaScript object where the method has the `Nan::FunctionCallback` signature (see <a href="#api_nan_method">Method declaration</a>).
Signature:
```c++
void Nan::SetMethod(v8::Local<v8::Object> recv,
const char *name,
Nan::FunctionCallback callback,
v8::Local<v8::Value> data = v8::Local<v8::Value>())
void Nan::SetMethod(v8::Local<v8::Template> templ,
const char *name,
Nan::FunctionCallback callback,
v8::Local<v8::Value> data = v8::Local<v8::Value>())
```
<a name="api_nan_set_prototype_method"></a>
### Nan::SetPrototypeMethod()
Sets a method with a given name on a `FunctionTemplate`'s prototype where the method has the `Nan::FunctionCallback` signature (see <a href="#api_nan_method">Method declaration</a>).
Signature:
```c++
void Nan::SetPrototypeMethod(v8::Local<v8::FunctionTemplate> recv,
const char* name,
Nan::FunctionCallback callback,
v8::Local<v8::Value> data = v8::Local<v8::Value>())
```
<a name="api_nan_set_accessor"></a>
### Nan::SetAccessor()
Sets getters and setters for a property with a given name on an `ObjectTemplate` or a plain `Object`. Accepts getters with the `Nan::GetterCallback` signature (see <a href="#api_nan_getter">Getter declaration</a>) and setters with the `Nan::SetterCallback` signature (see <a href="#api_nan_setter">Setter declaration</a>).
Signature:
```c++
void SetAccessor(v8::Local<v8::ObjectTemplate> tpl,
v8::Local<v8::String> name,
Nan::GetterCallback getter,
Nan::SetterCallback setter = 0,
v8::Local<v8::Value> data = v8::Local<v8::Value>(),
v8::AccessControl settings = v8::DEFAULT,
v8::PropertyAttribute attribute = v8::None,
imp::Sig signature = imp::Sig());
bool SetAccessor(v8::Local<v8::Object> obj,
v8::Local<v8::String> name,
Nan::GetterCallback getter,
Nan::SetterCallback setter = 0,
v8::Local<v8::Value> data = v8::Local<v8::Value>(),
v8::AccessControl settings = v8::DEFAULT,
v8::PropertyAttribute attribute = v8::None)
```
See the V8 [`ObjectTemplate#SetAccessor()`](https://v8docs.nodesource.com/node-8.16/db/d5f/classv8_1_1_object_template.html#aca0ed196f8a9adb1f68b1aadb6c9cd77) and [`Object#SetAccessor()`](https://v8docs.nodesource.com/node-8.16/db/d85/classv8_1_1_object.html#ae91b3b56b357f285288c89fbddc46d1b) for further information about how to use `Nan::SetAccessor()`.
<a name="api_nan_set_named_property_handler"></a>
### Nan::SetNamedPropertyHandler()
Sets named property getters, setters, query, deleter and enumerator methods on an `ObjectTemplate`. Accepts:
* Property getters with the `Nan::PropertyGetterCallback` signature (see <a href="#api_nan_property_getter">Property getter declaration</a>)
* Property setters with the `Nan::PropertySetterCallback` signature (see <a href="#api_nan_property_setter">Property setter declaration</a>)
* Property query methods with the `Nan::PropertyQueryCallback` signature (see <a href="#api_nan_property_query">Property query declaration</a>)
* Property deleters with the `Nan::PropertyDeleterCallback` signature (see <a href="#api_nan_property_deleter">Property deleter declaration</a>)
* Property enumerators with the `Nan::PropertyEnumeratorCallback` signature (see <a href="#api_nan_property_enumerator">Property enumerator declaration</a>)
Signature:
```c++
void SetNamedPropertyHandler(v8::Local<v8::ObjectTemplate> tpl,
Nan::PropertyGetterCallback getter,
Nan::PropertySetterCallback setter = 0,
Nan::PropertyQueryCallback query = 0,
Nan::PropertyDeleterCallback deleter = 0,
Nan::PropertyEnumeratorCallback enumerator = 0,
v8::Local<v8::Value> data = v8::Local<v8::Value>())
```
See the V8 [`ObjectTemplate#SetNamedPropertyHandler()`](https://v8docs.nodesource.com/node-8.16/db/d5f/classv8_1_1_object_template.html#a33b3ebd7de641f6cc6414b7de01fc1c7) for further information about how to use `Nan::SetNamedPropertyHandler()`.
<a name="api_nan_set_indexed_property_handler"></a>
### Nan::SetIndexedPropertyHandler()
Sets indexed property getters, setters, query, deleter and enumerator methods on an `ObjectTemplate`. Accepts:
* Indexed property getters with the `Nan::IndexGetterCallback` signature (see <a href="#api_nan_index_getter">Index getter declaration</a>)
* Indexed property setters with the `Nan::IndexSetterCallback` signature (see <a href="#api_nan_index_setter">Index setter declaration</a>)
* Indexed property query methods with the `Nan::IndexQueryCallback` signature (see <a href="#api_nan_index_query">Index query declaration</a>)
* Indexed property deleters with the `Nan::IndexDeleterCallback` signature (see <a href="#api_nan_index_deleter">Index deleter declaration</a>)
* Indexed property enumerators with the `Nan::IndexEnumeratorCallback` signature (see <a href="#api_nan_index_enumerator">Index enumerator declaration</a>)
Signature:
```c++
void SetIndexedPropertyHandler(v8::Local<v8::ObjectTemplate> tpl,
Nan::IndexGetterCallback getter,
Nan::IndexSetterCallback setter = 0,
Nan::IndexQueryCallback query = 0,
Nan::IndexDeleterCallback deleter = 0,
Nan::IndexEnumeratorCallback enumerator = 0,
v8::Local<v8::Value> data = v8::Local<v8::Value>())
```
See the V8 [`ObjectTemplate#SetIndexedPropertyHandler()`](https://v8docs.nodesource.com/node-8.16/db/d5f/classv8_1_1_object_template.html#ac89f06d634add0e890452033f7d17ff1) for further information about how to use `Nan::SetIndexedPropertyHandler()`.
<a name="api_nan_set_template"></a>
### Nan::SetTemplate()
Adds properties on an `Object`'s or `Function`'s template.
Signature:
```c++
void Nan::SetTemplate(v8::Local<v8::Template> templ,
const char *name,
v8::Local<v8::Data> value);
void Nan::SetTemplate(v8::Local<v8::Template> templ,
v8::Local<v8::String> name,
v8::Local<v8::Data> value,
v8::PropertyAttribute attributes)
```
Calls the `Template`'s [`Set()`](https://v8docs.nodesource.com/node-8.16/db/df7/classv8_1_1_template.html#ae3fbaff137557aa6a0233bc7e52214ac).
<a name="api_nan_set_prototype_template"></a>
### Nan::SetPrototypeTemplate()
Adds properties on an `Object`'s or `Function`'s prototype template.
Signature:
```c++
void Nan::SetPrototypeTemplate(v8::Local<v8::FunctionTemplate> templ,
const char *name,
v8::Local<v8::Data> value);
void Nan::SetPrototypeTemplate(v8::Local<v8::FunctionTemplate> templ,
v8::Local<v8::String> name,
v8::Local<v8::Data> value,
v8::PropertyAttribute attributes)
```
Calls the `FunctionTemplate`'s _PrototypeTemplate's_ [`Set()`](https://v8docs.nodesource.com/node-8.16/db/df7/classv8_1_1_template.html#a2db6a56597bf23c59659c0659e564ddf).
<a name="api_nan_set_instance_template"></a>
### Nan::SetInstanceTemplate()
Use to add instance properties on `FunctionTemplate`'s.
Signature:
```c++
void Nan::SetInstanceTemplate(v8::Local<v8::FunctionTemplate> templ,
const char *name,
v8::Local<v8::Data> value);
void Nan::SetInstanceTemplate(v8::Local<v8::FunctionTemplate> templ,
v8::Local<v8::String> name,
v8::Local<v8::Data> value,
v8::PropertyAttribute attributes)
```
Calls the `FunctionTemplate`'s _InstanceTemplate's_ [`Set()`](https://v8docs.nodesource.com/node-8.16/db/df7/classv8_1_1_template.html#a2db6a56597bf23c59659c0659e564ddf).
<a name="api_nan_set_call_handler"></a>
### Nan::SetCallHandler()
Set the call-handler callback for a `v8::FunctionTemplate`.
This callback is called whenever the function created from this FunctionTemplate is called.
Signature:
```c++
void Nan::SetCallHandler(v8::Local<v8::FunctionTemplate> templ, Nan::FunctionCallback callback, v8::Local<v8::Value> data = v8::Local<v8::Value>())
```
Calls the `FunctionTemplate`'s [`SetCallHandler()`](https://v8docs.nodesource.com/node-8.16/d8/d83/classv8_1_1_function_template.html#ab7574b298db3c27fbc2ed465c08ea2f8).
<a name="api_nan_set_call_as_function_handler"></a>
### Nan::SetCallAsFunctionHandler()
Sets the callback to be used when calling instances created from the `v8::ObjectTemplate` as a function.
If no callback is set, instances behave like normal JavaScript objects that cannot be called as a function.
Signature:
```c++
void Nan::SetCallAsFunctionHandler(v8::Local<v8::ObjectTemplate> templ, Nan::FunctionCallback callback, v8::Local<v8::Value> data = v8::Local<v8::Value>())
```
Calls the `ObjectTemplate`'s [`SetCallAsFunctionHandler()`](https://v8docs.nodesource.com/node-8.16/db/d5f/classv8_1_1_object_template.html#a5e9612fc80bf6db8f2da199b9b0bd04e).