v8::PropertyCallbackInfo< T > Class Template Reference

#include <v8.h>

Public Member Functions
V8_INLINE Isolate *	GetIsolate () const
V8_INLINE Local< Value >	Data () const
V8_INLINE Local< Object >	This () const
V8_INLINE Local< Object >	Holder () const
V8_INLINE ReturnValue< T >	GetReturnValue () const
V8_INLINE bool	ShouldThrowOnError () const

Static Public Attributes
static const int	kArgsLength = 7

Protected Member Functions
V8_INLINE	PropertyCallbackInfo (internal::Object **args)

Protected Attributes
internal::Object **	args_

Static Protected Attributes
static const int	kShouldThrowOnErrorIndex = 0
static const int	kHolderIndex = 1
static const int	kIsolateIndex = 2
static const int	kReturnValueDefaultValueIndex = 3
static const int	kReturnValueIndex = 4
static const int	kDataIndex = 5
static const int	kThisIndex = 6

Friends
class	MacroAssembler
class	internal::PropertyCallbackArguments
class	internal::CustomArguments< PropertyCallbackInfo >

Detailed Description

template<typename T>
class v8::PropertyCallbackInfo< T >

The information passed to a property callback about the context of the property access.

Member Function Documentation

Data()

template<typename T >

Local< Value > v8::PropertyCallbackInfo< T >::Data

(

)

const

Returns

The data set in the configuration, i.e., in NamedPropertyHandlerConfiguration or IndexedPropertyHandlerConfiguration.

GetIsolate()

template<typename T >

Isolate * v8::PropertyCallbackInfo< T >::GetIsolate

(

)

const

Returns

The isolate of the property access.

GetReturnValue()

template<typename T >

ReturnValue< T > v8::PropertyCallbackInfo< T >::GetReturnValue

(

)

const

Returns

The return value of the callback. Can be changed by calling Set().

info.GetReturnValue().Set(...)

Holder()

template<typename T >

Local< Object > v8::PropertyCallbackInfo< T >::Holder

(

)

const

Returns

The object in the prototype chain of the receiver that has the interceptor. Suppose you have x and its prototype is y, and y has an interceptor. Then info.This() is x and info.Holder() is y. The Holder() could be a hidden object (the global object, rather than the global proxy).

Note

For security reasons, do not pass the object back into the runtime.

ShouldThrowOnError()

template<typename T >

bool v8::PropertyCallbackInfo< T >::ShouldThrowOnError

(

)

const

Returns

True if the intercepted function should throw if an error occurs. Usually, true corresponds to ‘'use strict’`.

Note

Always false when intercepting Reflect.set() independent of the language mode.

This()

template<typename T >

Local< Object > v8::PropertyCallbackInfo< T >::This

(

)

const

Returns

The receiver. In many cases, this is the object on which the property access was intercepted. When using Reflect.get, Function.prototype.call, or similar functions, it is the object passed in as receiver or thisArg.

void GetterCallback(Local<Name> name,
                    const v8::PropertyCallbackInfo<v8::Value>& info) {
   auto context = info.GetIsolate()->GetCurrentContext();

   v8::Local<v8::Value> a_this =
       info.This()
           ->GetRealNamedProperty(context, v8_str("a"))
           .ToLocalChecked();
   v8::Local<v8::Value> a_holder =
       info.Holder()
           ->GetRealNamedProperty(context, v8_str("a"))
           .ToLocalChecked();

  CHECK(v8_str("r")->Equals(context, a_this).FromJust());
  CHECK(v8_str("obj")->Equals(context, a_holder).FromJust());

  info.GetReturnValue().Set(name);
}

v8::Local<v8::FunctionTemplate> templ =
v8::FunctionTemplate::New(isolate);
templ->InstanceTemplate()->SetHandler(
    v8::NamedPropertyHandlerConfiguration(GetterCallback));
LocalContext env;
env->Global()
    ->Set(env.local(), v8_str("obj"), templ->GetFunction(env.local())
                                         .ToLocalChecked()
                                         ->NewInstance(env.local())
                                         .ToLocalChecked())
    .FromJust();

CompileRun("obj.a = 'obj'; var r = {a: 'r'}; Reflect.get(obj, 'x', r)");

---

The documentation for this class was generated from the following file:

• v8/include/v8.h