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Global Property Singleton

Peter LaDow · 2015-01-02T15:24:39

I'm having a similar problem as in this other post. But I'm not quite understanding how to fix this. I have C++ objects I want to expose to the script as singletons of a particular class. I want these objects to be properties accessible to the script, but not be copyable or otherwise changed. These exposed object would have particular methods. These exposed objects would have application lifetime (they are created at the beginning and kept until the application exists). For example, say I have this class in C++: class MyClass { public: MyClass(const std:string& n) : name(n) { } const std::string& get_name() const { return name; } private: const std::string name; }; I want to expose several instances of MyClass to Angelscript as global properties. I register the class and method doing the following: r = engine->RegisterObjectType("MyClass", 0, asOBJ_REF|asOBJ_NOCOUNT); assert(r >= 0); r = engine->RegisterObjectMethod("MyClass", "const string name() const", asMETHOD(MyClass, get_name), asCALL_THISCALL); assert(r >= 0); And then I create some instances and register them as global properties: std::shared_ptr<MyClass> foo = std::make_shared<MyClass("foo"); std::shared_ptr<MyClass> bar = std::make_shared<MyClass("bar"); r = engine->RegisterGlobalProperty("MyClass foo", foo.get()); assert(r >= 0); r = engine->RegisterGlobalProperty("MyClass bar", bar.get()); assert(r >= 0); Then in Angelscript, whenever I try to invoke MyClass::get_name, 'this' is the wrong value. For example, stepping through with gdb, I get the following: foo.get() = 0x82c6f0 bar.get() = 0x82cd60 And in Angelscript, if I do: void main() { string n = foo.name(); } And setting a breakpoint in MyClass::get_name, 'this' is 0x82fd38, which is clearly something on the heap (perhaps something allocated by AS?). I tried to follow the examples from other posts on singletons, such as this and this. But it doesn't seem to be working. I'm using Angelscript 2.29.2.

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Started by PlayDough December 31, 2014 05:44 PM

9 comments, last by WitchLord 9 years, 6 months ago

WitchLord

4,838

January 02, 2015 03:24 PM

I agree with you that it would be better if the engine could validate and report an error if the given signature is not compatible with the function pointer, but unfortunately I haven't figured out how to do this in an appropriate manner yet.

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🎉 Celebrating 25 Years of GameDev.net! 🎉

Global Property Singleton

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