我正在尝试创建一个 Node.js C++ 插件来生成斐波那契数列以将其速度与普通 Node.js 模块进行比较,但我在设置数组的某个索引时遇到了问题。到目前为止我已经知道了:
#include <node.h>
namespace demo {
using v8::FunctionCallbackInfo;
using v8::Isolate;
using v8::Local;
using v8::Object;
using v8::Value;
using v8::Number;
using v8::Array;
void Method(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
int next, first = 0, second = 0, c = 0, n = args[0]->NumberValue();
Local<Array> arr = Array::New(isolate, n);
for (; c < n; c++) {
if ( c <= 1 ) next = c;
else {
next = first + second;
first = second;
second = next;
}
// How to set arr[c]?????
}
args.GetReturnValue().Set(arr);
}
void init(Local<Object> exports) {
NODE_SET_METHOD(exports, "fib", Method);
}
NODE_MODULE(addon, init)
}
第26行,arr[c]
应该怎么设置? v8:Array
不提供下标运算符。
最佳答案
how should I set arr[c]? v8:Array doesn't provide a subscript operator.
它不是,但是 v8::Array
已经从 v8::Object
继承了函数成员 Set
,带有一个以整数 (uint32_t
) 作为键的重载。用它来填充数组的每个元素:
void Method(const FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
int next, first = 0, second = 0, c = 0, n = args[0]->NumberValue();
Local<Array> arr = Array::New(isolate, n);
int i = 0;
for (; c < n; c++) {
if ( c <= 1 ) next = c;
else {
next = first + second;
first = second;
second = next;
}
arr->Set(i++, Number::New(isolate, next));
}
args.GetReturnValue().Set(arr);
}
关于c++ - Node.js C++ Addon - 设置数组的特定索引,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/43401843/