Alias for variables in pattern matching
up vote
0
down vote
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I often have something similar to the following (standard type definition for trees):
match tree with
| Branch(v, Branch(vl, tll, tlr), _) = f Branch(vl, tll, tlr)
In other languages there is the ability to do something like:
match tree with
| Branch(v, tl@Branch(_, _, _), _) = f tl
Does OCaml have something similar?
ocaml
asked Nov 11 at 18:03
Cjen1
8581731
add a comment |
up vote
0
down vote
favorite
I often have something similar to the following (standard type definition for trees):
match tree with
| Branch(v, Branch(vl, tll, tlr), _) = f Branch(vl, tll, tlr)
In other languages there is the ability to do something like:
match tree with
| Branch(v, tl@Branch(_, _, _), _) = f tl
Does OCaml have something similar?
ocaml
asked Nov 11 at 18:03
Cjen1
8581731
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
I often have something similar to the following (standard type definition for trees):
match tree with
| Branch(v, Branch(vl, tll, tlr), _) = f Branch(vl, tll, tlr)
In other languages there is the ability to do something like:
match tree with
| Branch(v, tl@Branch(_, _, _), _) = f tl
Does OCaml have something similar?
ocaml
asked Nov 11 at 18:03
Cjen1
8581731
I often have something similar to the following (standard type definition for trees):
match tree with
| Branch(v, Branch(vl, tll, tlr), _) = f Branch(vl, tll, tlr)
In other languages there is the ability to do something like:
match tree with
| Branch(v, tl@Branch(_, _, _), _) = f tl
Does OCaml have something similar?
ocaml
ocaml
asked Nov 11 at 18:03
Cjen1
8581731
asked Nov 11 at 18:03
Cjen1
8581731
edited Nov 11 at 18:13
asked Nov 11 at 18:03
Cjen1
8581731
asked Nov 11 at 18:03
Cjen1
8581731
asked Nov 11 at 18:03
Cjen1
8581731
8581731
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
up vote
1
down vote
accepted
This is done using the as keyword in OCaml:
match tree with
| Branch(v, (Branch(_, _, _) as tl), _) = f tl
answered Nov 11 at 18:16
sepp2k
291k38593605
This is failing to compile for me, although it works if I surround theBranch(_,_,_) as tlin parenthesis
– Cjen1
Nov 11 at 18:23
1
@Cjen1 Right, my mistake. Without the parentheses it takev, Branch(_,_,_)to be the left operand ofas.
– sepp2k
Nov 11 at 18:31
add a comment |
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
1
down vote
accepted
This is done using the as keyword in OCaml:
match tree with
| Branch(v, (Branch(_, _, _) as tl), _) = f tl
answered Nov 11 at 18:16
sepp2k
291k38593605
This is failing to compile for me, although it works if I surround theBranch(_,_,_) as tlin parenthesis
– Cjen1
Nov 11 at 18:23
1
@Cjen1 Right, my mistake. Without the parentheses it takev, Branch(_,_,_)to be the left operand ofas.
– sepp2k
Nov 11 at 18:31
add a comment |
up vote
1
down vote
accepted
This is done using the as keyword in OCaml:
match tree with
| Branch(v, (Branch(_, _, _) as tl), _) = f tl
answered Nov 11 at 18:16
sepp2k
291k38593605
This is failing to compile for me, although it works if I surround theBranch(_,_,_) as tlin parenthesis
– Cjen1
Nov 11 at 18:23
1
@Cjen1 Right, my mistake. Without the parentheses it takev, Branch(_,_,_)to be the left operand ofas.
– sepp2k
Nov 11 at 18:31
add a comment |
up vote
1
down vote
accepted
up vote
1
down vote
accepted
This is done using the as keyword in OCaml:
match tree with
| Branch(v, (Branch(_, _, _) as tl), _) = f tl
answered Nov 11 at 18:16
sepp2k
291k38593605
This is done using the as keyword in OCaml:
match tree with
| Branch(v, (Branch(_, _, _) as tl), _) = f tl
answered Nov 11 at 18:16
sepp2k
291k38593605
edited Nov 11 at 18:31
answered Nov 11 at 18:16
sepp2k
291k38593605
answered Nov 11 at 18:16
sepp2k
291k38593605
answered Nov 11 at 18:16
sepp2k
291k38593605
291k38593605
This is failing to compile for me, although it works if I surround theBranch(_,_,_) as tlin parenthesis
– Cjen1
Nov 11 at 18:23
1
@Cjen1 Right, my mistake. Without the parentheses it takev, Branch(_,_,_)to be the left operand ofas.
– sepp2k
Nov 11 at 18:31
add a comment |
This is failing to compile for me, although it works if I surround theBranch(_,_,_) as tlin parenthesis
– Cjen1
Nov 11 at 18:23
1
@Cjen1 Right, my mistake. Without the parentheses it takev, Branch(_,_,_)to be the left operand ofas.
– sepp2k
Nov 11 at 18:31
This is failing to compile for me, although it works if I surround the
Branch(_,_,_) as tl in parenthesis– Cjen1
Nov 11 at 18:23
This is failing to compile for me, although it works if I surround the
Branch(_,_,_) as tl in parenthesis– Cjen1
Nov 11 at 18:23
1
1
@Cjen1 Right, my mistake. Without the parentheses it take
v, Branch(_,_,_) to be the left operand of as.– sepp2k
Nov 11 at 18:31
@Cjen1 Right, my mistake. Without the parentheses it take
v, Branch(_,_,_) to be the left operand of as.– sepp2k
Nov 11 at 18:31
add a comment |
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