Compiler error:

error: class ‘Gram’ does not have any field named ‘T_Packet’

Change:

Gram :: Gram(string aName,int ns)
: T_Packet(aName, Gram_PACKET_TYPE, Gram_WORDTYPENAME,
Gram_PACKET_DESC, Gram_PACKET_EXT) {
…
}

To:

Gram :: Gram(string aName,int ns)
: T_Packet<Gram_DATATYPE>(aName, Gram_PACKET_TYPE, Gram_WORDTYPENAME,
Gram_PACKET_DESC, Gram_PACKET_EXT) {
…
}