ai :: SearchProblem :: apply_action
The returned state can be:
== and hash method
are correctly implemented.Remember, this method should not modify its parameters.
REQUIRE: actions(state).has(action)
# The new state when applying a given action
#
# The returned state can be:
# * a completely new state,
# * an existing state,
# * a new state but equals to an existing state
# in this case, ensure that the `==` and `hash` method
# are correctly implemented.
#
# Remember, this method should not modify its parameters.
#
# REQUIRE: `actions(state).has(action)`
fun apply_action(state:S, action:A): S is abstract
lib/ai/search.nit:71,2--83,51
# Return the state where the tile at hole+action has moved
redef fun apply_action(state, action)
do
# Copy the state
var res = new ArrayCmp[Tile].with_capacity(state.length)
res.add_all(state)
# Get the hole and the tile next to it
var h = get_hole(res)
var t = h + action
# Move (by swapping the tile and the hole)
res[h] = res[t]
res[t] = hole
return res
end
lib/ai/examples/puzzle.nit:111,2--127,4