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?Term1 @< ?Term2

Succeeds if term Term1 is before term Term2 in the standard ordering.
Term1
An arbitrary term.
Term2
An arbitrary term.

Description

Succeeds if term Term1 precedes term Term2 in the standard ordering of terms.

See compare/3 for the definition of this standard ordering.

Modes and Determinism

Fail Conditions

Fails if Term1 does not precede Term2.

Examples

   Success:
   X @< 1.0.           (gives X = _g68)
   0.0 @< 1.
   2.0 @< 1.
   "a" @< a.
   atoma @< atomb.
   [a|b] @< [a,b].
   b(1) @< a(1,1).
   a(1,2,3,4.0) @< a(1,2,3,0).
   Fail:
   1.0 @< X.
   atomb @< atoma.
   f(1,1) @< f(1).

See Also

compare / 3, @> / 2, @=< / 2, @>= / 2