dest_type

Type.dest_type : hol_type -> string * hol_type list

Breaks apart a non-variable type.

If ty is a type constant, then dest_type ty returns (ty,[]). If ty is a compound type (ty1,...,tyn)tyop, then dest_type ty returns (tyop,[ty1,...,tyn]).

Failure

Fails if ty is a type variable.

Example

- dest_type bool;
> val it = ("bool", []) : string * hol_type list

- dest_type (alpha --> bool);
> val it = ("fun", [`:'a`, `:bool`]) : string * hol_type list

Comments

A more precise alternative is dest_thy_type, which tells which theory the type operator was declared in.

See also

Type.mk_type, Type.dest_thy_type, Type.dest_vartype