null-pointer-p

Syntax

Arguments and Values

ptr

A foreign pointer that may be a null pointer.

boolean

T or NIL.

Description

The function null-pointer-p returns true if ptr is a null pointer and false otherwise.

Examples

    CFFI> (null-pointer-p (null-pointer))
    ⇒ T

    (defun contains-str-p (big little)
      (not (null-pointer-p
            (foreign-funcall "strstr" :string big :string little :pointer))))
    
    CFFI> (contains-str-p "Popcorns" "corn")
    ⇒ T
    CFFI> (contains-str-p "Popcorns" "salt")
    ⇒ NIL

See Also

null-pointer
pointerp