我如何使用std::string在一个c++插件的Node.js

我试图包装c++对象在javascript中使用按照这里的node.js文档:https://nodejs.org/api/addons.html#addons_wrapping_c_objects

插件将构建没有错误，并正常工作时，我的对象"AnObject"只有数字属性，即"int32_t年龄;"。

当我添加属性"std::string name;"到AnObject， "node-gyp configure"工作，然而"node-gyp build"给出以下错误:

Wills-MacBook-Pro:cppObjectWrapping willalley$ node-gyp build
[...]
In file included from ../personAddon.cc:3:
../AnObject.h:24:21: error: implicit instantiation of undefined template 
'std::basic_string<char, std::char_traits<char>,
      std::allocator<char> >'
        std::string name;
                    ^
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
/MacOSX10.12.sdk/usr/include/c++/4.2.1/bits/stringfwd.h:56:11: note: 
      template is declared here
    class basic_string;
          ^
1 error generated.
[...]
Wills-MacBook-Pro:cppObjectWrapping willalley$

这是抛出错误的对象头文件，AnObject.h:

    #pragma once
    #include <node.h>
    #include <node_object_wrap.h>
    #include <string.h>
    namespace demo {
        class AnObject : public node::ObjectWrap {
        public:
            static void Init(v8::Local<v8::Object> exports);
        private:
            explicit AnObject(int32_t num = 19);
            ~AnObject();
            static void New(const v8::FunctionCallbackInfo<v8::Value>& args);
            static void setAge(const v8::FunctionCallbackInfo<v8::Value>& args);
            static void getAge(const v8::FunctionCallbackInfo<v8::Value>& args);
            static void setName(const v8::FunctionCallbackInfo<v8::Value>& args);
            static void getName(const v8::FunctionCallbackInfo<v8::Value>& args);
            static v8::Persistent<v8::Function> constructor;
            int32_t age;
            std::string name;
        };
    }  // namespace demo

，如果你很好奇，实现文件AnObject.cc:

#include "AnObject.h"
#include <string.h>
namespace demo {
    using v8::Context;
    using v8::Function;
    using v8::FunctionCallbackInfo;
    using v8::FunctionTemplate;
    using v8::Isolate;
    using v8::Local;
    using v8::Number;
    using v8::Object;
    using v8::Persistent;
    using v8::String;
    using v8::Value;
    Persistent<Function> AnObject::constructor;
    AnObject::AnObject(int32_t age_) : age(age_) {
    }
    AnObject::~AnObject() {
    }
    void AnObject::Init(Local<Object> exports) {
        Isolate* isolate = exports->GetIsolate();
        // Prepare constructor template
        Local<FunctionTemplate> tpl = FunctionTemplate::New(isolate, New);
        tpl->SetClassName(String::NewFromUtf8(isolate, "AnObject"));
        tpl->InstanceTemplate()->SetInternalFieldCount(1);
        // Prototype
        NODE_SET_PROTOTYPE_METHOD(tpl, "setAge", setAge);
        NODE_SET_PROTOTYPE_METHOD(tpl, "setName", setName);
        NODE_SET_PROTOTYPE_METHOD(tpl, "getAge", getAge);
        NODE_SET_PROTOTYPE_METHOD(tpl, "getName", getName);
        constructor.Reset(isolate, tpl->GetFunction());
        exports->Set(String::NewFromUtf8(isolate, "AnObject"),
                     tpl->GetFunction());
    }
    void AnObject::New(const FunctionCallbackInfo<Value>& args) {
        Isolate* isolate = args.GetIsolate();
        if (args.IsConstructCall()) {
            // Invoked as constructor: `new AnObject(...)`
            int32_t value = args[0]->IsUndefined() ? 0 : args[0]->Int32Value();;
            AnObject* obj = new AnObject(value);
            obj->Wrap(args.This());
            args.GetReturnValue().Set(args.This());
        } else {
            // Invoked as plain function `AnObject(...)`, turn into construct call.
            const int argc = 1;
            Local<Value> argv[argc] = { args[0] };
            Local<Context> context = isolate->GetCurrentContext();
            Local<Function> cons = Local<Function>::New(isolate, constructor);
            Local<Object> result =
            cons->NewInstance(context, argc, argv).ToLocalChecked();
            args.GetReturnValue().Set(result);
        }
    }
    void AnObject::setAge(const FunctionCallbackInfo<Value>& args) {
        Isolate* isolate = args.GetIsolate();
        AnObject* obj = ObjectWrap::Unwrap<AnObject>(args.Holder());
        if (args[0]->IsInt32()){
            obj->age = args[0]->Int32Value();
            args.GetReturnValue().Set(Number::New(isolate, obj->age));
        }
    }
    void AnObject::setName(const v8::FunctionCallbackInfo<v8::Value>& args) {
        Isolate* isolate = args.GetIsolate();
        AnObject* obj = ObjectWrap::Unwrap<AnObject>(args.Holder());
        if (args[0]->isString()) {
            std::string input(*v8::String::Utf8Value(args[0]->ToString()));
            obj->name = input;
            args.GetReturnValue().Set(Number::New(isolate, obj->name));
        }
    }
    void AnObject::getAge(const FunctionCallbackInfo<Value>& args) {
        Isolate* isolate = args.GetIsolate();
        AnObject* obj = ObjectWrap::Unwrap<AnObject>(args.Holder());
        args.GetReturnValue().Set(Number::New(isolate, obj->age));
    }
    void AnObject::getName(const FunctionCallbackInfo<Value>& args) {
        Isolate* isolate = args.GetIsolate();
        AnObject* obj = ObjectWrap::Unwrap<AnObject>(args.Holder());
        v8::Local<v8::String> output = v8::String::NewFromUtf8(isolate, name.cstr());
        args.GetReturnValue().Set(Number::New(isolate, output));
    }
}  // namespace demo