如何在WebAssembly中使用（C ++ STL的）向量

问题描述

#include <iostream>
#include<vector>
using namespace std;

vector<int> ver;

int pushData(int n)
{
    for(int i=0;i<n;i++)
    {
        ver.push_back(i);
    }
}

我想从JS调用pushData函数并推送一些数据矢量 ver，以后再使用。
请解释如何使用WebAssembly。

I want to call pushData function from JS and push some data to vector "ver" and use it later.please explain how to do that using WebAssembly.

推荐答案

我尝试通过使用以下答案回答您的问题：

I tried to answer your question, by using this answer:https://stackoverflow.com/a/46748966/544721

进行求解：

#include<vector>
const int SIZE = 10;
std::vector<int> data(10);

void add(int value) {
  for (int i=0; i<SIZE; i++) {
    data[i] = data[i] + value;
  }
}

int* getData() {
  return &(data[0]);
}

和js：

var wasmModule = new WebAssembly.Module(wasmCode);
var wasmInstance = new WebAssembly.Instance(wasmModule, wasmImports);

var offset = wasmInstance.exports.getData();

var linearMemory = new Uint32Array(wasmInstance.exports.memory.buffer, offset, 10);
for (var i = 0; i < linearMemory.length; i++) {
  linearMemory[i] = i;
}

wasmInstance.exports.add(10);

for (var i = 0; i < linearMemory.length; i++) {
  log(linearMemory[i]);
}

WasmFiddle：

WasmFiddle: https://wasdk.github.io/WasmFiddle//?wuycy

但是似乎有一些链接器错误：

But it looks like there is some linker error:

line 2: Uncaught LinkError: WebAssembly Instantiation: Import #9 module="env" function="__dso_handle" error: global import must be a number

任何人都可以帮助制作此C ++代码以在WasmFiddle中运行？

Can anyone help to make this C++ code to run in WasmFiddle?

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