Question

我正在为nodejs开发C ++插件。这是一个概率过滤器。我需要做的是将现有的c ++库绑定到nodejs。我正在按照https://nodejs.org/docs/latest/api/addons.html#addons_wrapping_c_objects

中文档的说明进行操作

我在github中还有另一个示例，向我展示了c ++中的概率过滤器如何绑定到nodejs：https://github.com/bbondy/bloom-filter-cpp。

我尝试将自己的c ++库转换为nodejs插件。现在我已经完成了编码，我尝试使用binding.gyp单独构建它。但是总会有一个错误： error

但是我确实在该类中包含SimdBlockFilter：这是simd_block_wrap.h的代码：

#ifndef simd_block_wrap_hpp
#define simd_block_wrap_hpp


#include <node.h>
#include <node_object_wrap.h>
#include "SimdBlockFilter.h"


namespace simd_block_wrap {
class simd_block_wrap : public SimdBlockFilter, public node::ObjectWrap {
public:
    static void Init(v8::Local<v8::Object> exports);
    simd_block_wrap(const int log_heap_space);

private:

    virtual ~simd_block_wrap();

    static void Add(const v8::FunctionCallbackInfo<v8::Value>& args);
    static void Find(const v8::FunctionCallbackInfo<v8::Value>& args);

    static v8::Persistent<v8::Function> constructor;
};
}
#endif /* simd_block_wrap_hpp */

这是binding.gyp的代码：

{
"targets": [{
"target_name": "addon",
"sources": [
  "addon.cpp",
  "SimdBlockFilter.h",
  "simd_block_wrap.cpp",
  "simd_block_wrap.h",
  "hashutil.cc",
  "hashutil.h",
],

"xcode_settings": {
  "OTHER_CFLAGS": [ "-ObjC" ],
  "OTHER_CPLUSPLUSFLAGS" : ["-std=c++11","-stdlib=libc++", "-v"],
  "MACOSX_DEPLOYMENT_TARGET": "10.9",
  "GCC_ENABLE_CPP_EXCEPTIONS": "YES",
},
}]
}

，还有c ++库SimdBlockFilter.h的代码

#pragma once

#include <cstdint>
#include <cstdlib>


#include <algorithm>
#include <new>

#include <immintrin.h>

#include "hashutil.h"

using uint32_t = ::std::uint32_t;
using uint64_t = ::std::uint64_t;

template<typename HashFamily =                
::cuckoofilter::TwoIndependentMultiplyShift>
class SimdBlockFilter {
private:
  // The filter is divided up into Buckets:
  using Bucket = uint32_t[8];

  // log2(number of bytes in a bucket):
  static constexpr int LOG_BUCKET_BYTE_SIZE = 5;

  static_assert(
     (1 << LOG_BUCKET_BYTE_SIZE) == sizeof(Bucket) && sizeof(Bucket)     == sizeof(__m256i),
  "Bucket sizing has gone awry.");

  // log_num_buckets_ is the log (base 2) of the number of buckets in the directory:
  const int log_num_buckets_;

  // directory_mask_ is (1 << log_num_buckets_) - 1. It is precomputed in the contructor
  // for efficiency reasons:
  const uint32_t directory_mask_;

  Bucket* directory_;

  HashFamily hasher_;

 public:
  // Consumes at most (1 << log_heap_space) bytes on the heap:
  explicit SimdBlockFilter(const int log_heap_space);
  SimdBlockFilter(SimdBlockFilter&& that)
    : log_num_buckets_(that.log_num_buckets_),
  directory_mask_(that.directory_mask_),
  directory_(that.directory_),
  hasher_(that.hasher_) {}
  ~SimdBlockFilter() noexcept;
  void Add(const uint64_t key) noexcept;
  bool Find(const uint64_t key) const noexcept;
  uint64_t SizeInBytes() const { return sizeof(Bucket) * (1ull << log_num_buckets_); }

 private:
  // A helper function for Insert()/Find(). Turns a 32-bit hash into a 256-bit Bucket
  // with 1 single 1-bit set in each 32-bit lane.
  static __m256i MakeMask(const uint32_t hash) noexcept;

  SimdBlockFilter(const SimdBlockFilter&) = delete;
  void operator=(const SimdBlockFilter&) = delete;
};

谢谢。

Answer 1

这可能意味着您的包含路径未正确设置。尝试将'include_dirs': ["include/path/for/SimdBlockFilter"]添加到您的binding.gyp中。

您的源文件中还应该包含#include "v8.h"。

node.js的C ++插件中的预期类名

1 个答案: