GreateLord: I want to define stack to save interface; interface base { void enter(); } class b : base { void enter() { } } //////////define a stack/////// stack.push( b ); how can i do it ? in c++, we define std::stack<?> stacker; what datatype "?" must be ? Or, how can i simulate a stack in angelscript to save b?

If all types that will be put on the stack implements the base interface, then you should be able to register the "std::stack<asIScriptStruct*>" type to take a "base@" type. However, the std::stack template won't automatically handle the reference counting, so you might want to register the methods with autohandles, or otherwise write wrapper functions to increment/decrement the reference counter properly.

Example:

engine->RegisterObjectMethod("stackOfBase", "void push(base@+)", asMETHOD(std::stack<asIScriptStruct*>, push), asCALL_THISCALL);