I've made a little test, see source below, that highlight my problem,
here is the output:
--- test 1 ---
Constructor: pointer=0x1 << prototype = new Base
Test: pointer=(nil)
Test: pointer=(nil)
--- test 2 ---
Constructor: pointer=0x2 << prototype = new Base
Constructor: pointer=0x3 << new Derived2
Test: pointer=0x3
Constructor: pointer=0x4 << new Derived2
Test: pointer=0x4
--- test 3 ---
Constructor: pointer=0x5 << prototype = new Base
Constructor: pointer=0x6 << new Derived3
Test: pointer=(nil)
Constructor: pointer=0x7 << new Derived3
Test: pointer=(nil)
Test 1:
If I'd like my native instance (Base) to be inherited as regular built-
in types like Array etc. Where should I
initialize it when the constructor is never called? Where does Array
initialize it's native parts when inherited?
Test 2:
Work. But only because the Base constructor i called. Built-in's don't
require this.
Test 3:
This is really wierd. Why does adding a property to the Derived
instance make the Constructor create/return, and/or the test function
be called with another "this". Bug?
I'm writing a runtime library for v8. I only want the users to be able
to use all the language features, including correct inheritance.
// g++ -m32 -Iinclude -L. test.cc -lpthread -lv8
#include <v8.h>
using namespace v8;
char* pointer = NULL;
Handle<Value> Constructor (const Arguments& args) {
args.This()->SetPointerInInternalField(0, ++pointer);
printf("Constructor: pointer=%p\n", pointer);
return args.This();
}
Handle<Value> Test (const Arguments& args) {
printf("Test: pointer=%p\n", args.This()-
>GetPointerFromInternalField(0));
return Undefined();
}
int main (int argc, char* argv[]) {
HandleScope scope;
Handle<ObjectTemplate> global = ObjectTemplate::New();
Persistent<Context> context = Context::New(NULL, global);
Context::Scope context_scope(context);
// native Base
Handle<String> class_name = String::NewSymbol("Base");
Handle<FunctionTemplate> constructor =
FunctionTemplate::New(Constructor);
constructor->SetClassName(class_name);
Handle<ObjectTemplate> prototype = constructor->PrototypeTemplate();
prototype->Set("test", FunctionTemplate::New(Test));
Handle<ObjectTemplate> instance = constructor->InstanceTemplate();
instance->SetInternalFieldCount(1);
Context::GetCurrent()->Global()->Set(class_name, constructor-
>GetFunction());
puts("--- test 1 ---");
Script::Compile(String::New(
"function Derived1 () {} \n"
"Derived1.prototype = new Base; \n"
"Derived1.prototype.constructor = Derived1; \n"
"(new Derived1).test(); \n"
"(new Derived1).test(); \n"
))->Run();
puts("--- test 2 ---");
Script::Compile(String::New(
"function Derived2 () { \n"
" Base.call(this); \n"
"} \n"
"Derived2.prototype = new Base; \n"
"Derived2.prototype.constructor = Derived2; \n"
"(new Derived2).test(); \n"
"(new Derived2).test(); \n"
))->Run();
puts("--- test 3 ---");
Script::Compile(String::New(
"function Derived3 () { \n"
" Base.call(this); \n"
" this.foo = true; \n"
"} \n"
"Derived3.prototype = new Base; \n"
"Derived3.prototype.constructor = Derived3; \n"
"(new Derived3).test(); \n"
"(new Derived3).test(); \n"
))->Run();
V8::Dispose();
return 0;
}
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