lakenen · March 15, 2016 21:05 · May 24, 2013 · May 23, 2013
diff --git a/helloworld-proxy.js b/helloworld-proxy.js
@@ -2,7 +2,7 @@
 var HW_constructor = Module.cwrap('HW_constructor', 'number', []);
 var HW_destructor = Module.cwrap('HW_destructor', null, ['number']);
 var HW_setX = Module.cwrap('HW_setX', null, ['number', 'number']);
-var HW_getX = Module.cwrap('HW_getFoo', 'number', ['number']);
+var HW_getX = Module.cwrap('HW_getX', 'number', ['number']);
 
 function HelloWorld() {
   this.ptr = HW_constructor();

diff --git a/build.sh b/build.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+emcc helloworld.cpp -o helloworld.js \
+  -s EXPORTED_FUNCTIONS="['_HW_constructor','_HW_destructor','_HW_setX','_HW_getX']"
+
+cat helloworld-proxy.js >> helloworld.js
diff --git a/helloworld-proxy.js b/helloworld-proxy.js
@@ -0,0 +1,21 @@
+// get references to the exposed proxy functions
+var HW_constructor = Module.cwrap('HW_constructor', 'number', []);
+var HW_destructor = Module.cwrap('HW_destructor', null, ['number']);
+var HW_setX = Module.cwrap('HW_setX', null, ['number', 'number']);
+var HW_getX = Module.cwrap('HW_getFoo', 'number', ['number']);
+
+function HelloWorld() {
+  this.ptr = HW_constructor();
+}
+
+HelloWorld.prototype.destroy = function () {
+  HW_destructor(this.ptr);
+};
+
+HelloWorld.prototype.setX = function (x) {
+  HW_setX(this.ptr, x);
+};
+
+HelloWorld.prototype.getX = function () {
+  return HW_getX(this.ptr);
+};
diff --git a/helloworld.cpp b/helloworld.cpp
@@ -0,0 +1,30 @@
+class HelloWorld
+{
+    int x;
+  public:
+    HelloWorld() { x = 0; }
+    ~HelloWorld() {}
+    void setX(int v) { x = v; }
+    int getX() { return x; }
+    // ...
+};
+
+//compile using "C" linkage to avoid name obfuscation
+extern "C" {
+  //constructor, returns a pointer to the HelloWorld object
+  void *HW_constructor() {
+    return new HelloWorld();
+  }
+
+  void HW_setX(HelloWorld *hw, int x) {
+    hw->setX(x);
+  }
+
+  int HW_getX(HelloWorld *hw) {
+    return hw->getX();
+  }
+
+  void HW_destructor(HelloWorld *hw) {
+    delete hw;
+  }
+};