halving happened this year is not positive impact on the price of bitcoin. even a decline, although not too high. but I am quite optimistic that the halving by 2020 will increase the price of bitcoin significantly.
halving does have an impact on the price of bitcoin,take a look at the price chart ,it is as simple as that,after halving the price went down because of the bitfinex hack.price will increase by the time of next halving if everything goes smoothly.