I got Eror(]No matching signatures to ... )with this code.

why it's not working?

class IInt{
...
virtual void regFunctions(asIScriptEngine*_engine)=0;
...
};

class Core:public Iint{
...
virtual void regFunctions(asIScriptEngine*_engine){
        Warning("regFunctions");
        int r;

        //
        //!Logging
        //
        r = _engine->RegisterGlobalFunction("void LogPrintf(const string val)", asFUNCTION(ScriptLogPrintf), asCALL_CDECL); assert( r >= 0 );
        r = _engine->RegisterGlobalFunction("void Warning(const string val)", asFUNCTION(ScriptWarning), asCALL_CDECL); assert( r >= 0 );
        r = _engine->RegisterGlobalFunction("void Debug(const string val)", asFUNCTION(ScriptDebug), asCALL_CDECL); assert( r >= 0 );
        r = _engine->RegisterGlobalFunction("void Error(const string val, bool val)", asFUNCTION(ScriptError), asCALL_CDECL); assert( r >= 0 );
       };
};

class Engine:public Core{
...
virtual void regFunctions(asIScriptEngine*_engine){Core::regFunctions(this->mASEngine)}
}
};

I think you need to provide a little more information. I see nothing wrong with what little you've given.

Post the full error message that the compiler gives, and we may be able to help.