如何更新我的function以使用新的v8 FunctionTemplates？

我有一些使用V8 FunctionTemplates的代码。 它是一个较老的Node.js模块的一部分，充当一个C ++库的包装器。

void NNet::PrototypeInit(Local<FunctionTemplate> t) { ... t->InstanceTemplate()->SetAccessor(Nan::New<String>("training_algorithm").ToLocalChecked(), GetTrainingAlgorithm, SetTrainingAlgorithm); t->InstanceTemplate()->SetAccessor(Nan::New<String>("learning_rate").ToLocalChecked(), GetLearningRate, SetLearningRate); t->InstanceTemplate()->SetAccessor(Nan::New<String>("learning_momentum").ToLocalChecked(), GetLearningMomentum, SetLearningMomentum); t->InstanceTemplate()->SetAccessor(Nan::New<String>("layers").ToLocalChecked(), GetLayerArray); } 

但是，当代码运行时，编译器会提供这些错误。

 In static member function 'static void NNet::PrototypeInit(v8::Local<v8::FunctionTemplate>)': error: invalid conversion from 'Nan::NAN_GETTER_RETURN_TYPE (*)(v8::Local<v8::String>, Nan::NAN_GETTER_ARGS_TYPE) {aka void (*)(v8::Local<v8::String>, const Nan::PropertyCallbackInfo<v8::Value>&)}' to 'v8::AccessorGetterCallback {aka void (*)(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>&)}' [-fpermissive] t->InstanceTemplate()->SetAccessor(Nan::New<String>("training_algorithm").ToLocalChecked(), GetTrainingAlgorithm, SetTrainingAlgorithm); ^ error: initializing argument 2 of 'void v8::ObjectTemplate::SetAccessor(v8::Local<v8::String>, v8::AccessorGetterCallback, v8::AccessorSetterCallback, v8::Local<v8::Value>, v8::AccessControl, v8::PropertyAttribute, v8::Local<v8::AccessorSignature>)' [-fpermissive] void SetAccessor( ^ error: invalid conversion from 'Nan::NAN_SETTER_RETURN_TYPE (*)(v8::Local<v8::String>, v8::Local<v8::Value>, Nan::NAN_SETTER_ARGS_TYPE) {aka void (*)(v8::Local<v8::String>, v8::Local<v8::Value>, const Nan::PropertyCallbackInfo<void>&)}' to 'v8::AccessorSetterCallback {aka void (*)(v8::Local<v8::String>, v8::Local<v8::Value>, const v8::PropertyCallbackInfo<void>&)}' [-fpermissive] t->InstanceTemplate()->SetAccessor(Nan::New<String>("training_algorithm").ToLocalChecked(), GetTrainingAlgorithm, SetTrainingAlgorithm); 

V8引擎的文档说

 The following example shows how to use a FunctionTemplate: * * \code * v8::Local<v8::FunctionTemplate> t = v8::FunctionTemplate::New(); * t->Set("func_property", v8::Number::New(1)); * * v8::Local<v8::Template> proto_t = t->PrototypeTemplate(); * proto_t->Set("proto_method", v8::FunctionTemplate::New(InvokeCallback)); * proto_t->Set("proto_const", v8::Number::New(2)); * * v8::Local<v8::ObjectTemplate> instance_t = t->InstanceTemplate(); * instance_t->SetAccessor("instance_accessor", InstanceAccessorCallback); * instance_t->SetNamedPropertyHandler(PropertyHandlerCallback, ...); * instance_t->Set("instance_property", Number::New(3)); * * v8::Local<v8::Function> function = t->GetFunction(); * v8::Local<v8::Object> instance = function->NewInstance(); * \endcode 

但我不知道如何使用这个来解决我的function。 有任何想法吗？

Answer 1

SetTrainingAlgorithm签名是：

 void SetTrainingAlgorithm(v8::Local<v8::String>, const Nan::PropertyCallbackInfo<v8::Value>&); 

但应该是：

 void SetTrainingAlgorithm(v8::Local<v8::String>, const v8::PropertyCallbackInfo<v8::Value>&); 

不一样的命名空间。

Answer 2

解决scheme是使用

  Nan::SetAccessor(t->InstanceTemplate(), Nan::New<String>("training_algorithm").ToLocalChecked(), GetTrainingAlgorithm, SetTrainingAlgorithm); Nan::SetAccessor(t->InstanceTemplate(), Nan::New<String>("learning_rate").ToLocalChecked(), GetLearningRate, SetLearningRate); Nan::SetAccessor(t->InstanceTemplate(), Nan::New<String>("learning_momentum").ToLocalChecked(), GetLearningMomentum, SetLearningMomentum); Nan::SetAccessor(t->InstanceTemplate(), Nan::New<String>("layers").ToLocalChecked(), GetLayerArray); 

代替。 这是从南库1版改为2版。