Availability:built-in
[ISO]bagof(+Template,
:Goal, -Bag)+Var^Goal
tells bagof/3
not to bind
Var in Goal. bagof/3
fails if Goal has no solutions.
The example below illustrates bagof/3
and the ^ operator. The variable bindings
are printed together on one line to save paper.
2 ?- listing(foo). foo(a, b, c). foo(a, b, d). foo(b, c, e). foo(b, c, f). foo(c, c, g). true. 3 ?- bagof(C, foo(A, B, C), Cs). A = a, B = b, C = G308, Cs = [c, d] ; A = b, B = c, C = G308, Cs = [e, f] ; A = c, B = c, C = G308, Cs = [g]. 4 ?- bagof(C, A^foo(A, B, C), Cs). A = G324, B = b, C = G326, Cs = [c, d] ; A = G324, B = c, C = G326, Cs = [e, f, g]. 5 ?-