11.3.51 current_op/3 [ISO]

Synopsis

current_op(?Precedence, ?Type, ?Name)

Succeeds when the atom Name is currently an operator of type Type and precedence Precedence.

Arguments

Precedence
integer, in the range 1-1200
Type
one of [xfx, xfy, yfx, fx, xf, yf]
Name
atom

Description

None of the arguments need be instantiated at the time of the call; that is, this predicate can be used to find the precedence or type of an operator or to backtrack through all operators.

To add or remove an operator, use op/3.

Exceptions

type_error
Name not an atom or Type not an atom or Precedence not an integer.
domain_error
Precedence not between 1-1200, or Type not one of listed atoms.

Examples

See Also

op/3, ref-syn-ops.


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