Hi,
Firstly, sorry for my bad English, I hope you will understand me clearly.
I search solution for my issues this week without success... It's why i
post here now.
I'm working in a C++ Tree module (very basic) and i need to use it in
Javascript.
I show you the code resume :
Tree.h
#include <vector>
> #include <memory>
> #include <iostream>
> #include <vector>
> #include <string>
> #include <emscripten/bind.h>
>
> class History_Tree : public std::enable_shared_from_this<History_Tree>
> {
> private:
>
> struct Move {
> int move;
> std::shared_ptr<History_Tree> children;
> };
>
> std::weak_ptr<History_Tree> parent;
> std::vector<Move> childrens;
>
> public:
>
> History_Tree()
> {}
>
> History_Tree(std::weak_ptr<History_Tree> parent): parent(parent)
> {}
>
> void append_next_move(int move);
> std::shared_ptr<History_Tree> get_ptr();
>
> };
>
>
Tree.cpp
#include "Tree.h"
>
> //////////////////////////////////////////////////////////////////////////
> void History_Tree::append_next_move(int move)
> //////////////////////////////////////////////////////////////////////////
> {
> Move m;
> m.move = move;
> m.children = std::make_shared<History_Tree>(get_ptr());
>
> childrens.push_back(m);
> }
>
> //////////////////////////////////////////////////////////////////////////
> std::shared_ptr<History_Tree> History_Tree::get_ptr()
> //////////////////////////////////////////////////////////////////////////
> {
> return shared_from_this();
> }
>
> EMSCRIPTEN_BINDINGS(History_Tree) {
> emscripten::class_<History_Tree>("History_Tree")
> .constructor<>()
> .smart_ptr<std::shared_ptr<History_Tree>>("History_TreePtr")
> .function("append_next_move", &History_Tree::append_next_move)
> ;
> }
>
>
As you can see in the bottom of .cpp, I did EMSCRIPTEN_BINDINGS for try to
use my class in .js.
After this i compile with this command :
em++ --bind -o Tree.js Tree.cpp
Seems to work even if i got a warning "unresolved symbol:
throwInternalError". I call my Tree.js in a html file, and try to do this :
var t = new Module.History_Tree();
> t.append_next_move(15);
>
The "append_next_move()" doesn't work. I can read in my browser Javascript
console "uncaught exception: 5271640".
After doing research, I guess that it is a variable address. The bug appear
when he read this line from Tree.cpp in "append_next_move()" :
m.children = std::make_shared<History_Tree>(get_ptr());
I probably misunderstand something... I don't know what is wrong exactly
and how fix this. (In the begin, I was using WebIDL Binder but not work too
haha...)
Maybe I need to say in EMSCRIPTEN_BINDINGS that History_Tree is
enable_shared_from_this ? I don't know...
Hope you will say to me "You're an idiot, the solution is ...". That would
be cool :D
For testing this, you just need to :
- Copy the Tree.cpp and Tree.h
- Compile with the command em++
- Create this .html
<!doctype html>
> <html lang="fr">
> <head>
> <meta charset="utf-8">
> <title>Error test</title>
> <script type="text/javascript" src="test.js"></script>
> </head>
> <body>
>
> <script>
> var t = new Module.History_Tree();
> t.append_next_move(15);
> </script>
>
> </body>
> </html>
>
>
- Open it in your browser and look at console.
Thanks for helping me.
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