Hi piglet woman,
I went through elective c-section early last month and was under GA. I am pleased to let you know that I have been breastfeeding my boy since then. Caesarean will not affect your milk supply - and mummies who give birth naturally may not have milk supply either.
One thing to note: you will need to take care of your wound when you breastfeed, as I have heard of ladies whose wound open up when the baby kick their wound whilst breastfeeding...
Best of Luck for your delivery!