Embind进阶用法（vector）

最新推荐文章于 2025-11-21 17:34:35 发布

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#c++ #servlet #开发语言

本文介绍如何使用Embind在JavaScript中与C++的std::vector<int>和std::map<int, std::string>进行交互，包括获取大小、修改值、插入元素、检索值以及遍历键值对等操作。" 88123291,8059985,C++ Primer Plus第六版：内联函数、引用与函数模板详解,"['C++编程', '引用', '函数模板', '函数重载', '内联函数']

#include <emscripten.h>
#include <emscripten/bind.h>
#include <string>
#include <vector>

using namespace emscripten;

std::vector<int> returnVectorData () {
std::vector<int> v(10, 1);
return v;
}

std::map<int, std::string> returnMapData () {
std::map<int, std::string> m;
m.insert(std::pair<int, std::string>(10, "This is a string."));
return m;
}

EMSCRIPTEN_BINDINGS(module) {
function("returnVectorData", &returnVectorData);
function("returnMapData", &returnMapData);

// register bindings for std::vector<int> and std::map<int, std::string>.
register_vector<int>("vector<int>");
register_map<int, std::string>("map<int, string>");
}

int main()
{
EM_ASM({
var retVector = Module['returnVectorData']();

// vector size
var vectorSize = retVector.size();

// reset vector value
retVector.set(vectorSize - 1, 11);

// push value into vector
retVector.push_back(12);

       // retrieve value from the vector
       for (var i = 0; i < retVector.size(); i++) {
           console.log("Vector Value: ", retVector.get(i));
       }

// expand vector size
retVector.resize(20, 1);

var retMap = Module['returnMapData']();

// map size
var mapSize = retMap.size();

// retrieve value from map
console.log("Map Value: ", retMap.get(10));

       // figure out which map keys are available
       // NB! You must call `register_vector<key_type>`
       // to make vectors available
       var mapKeys = retMap.keys();
       for (var i = 0; i < mapKeys.size(); i++) {
           var key = mapKeys.get(i);
           console.log("Map key/value: ", key, retMap.get(key));
       }

       // reset the value at the given index position
       retMap.set(10, "OtherValue");
   });
}