Class: FalseClass

Inherits:
Object show all
Defined in:
object.c

Overview

The global value false is the only instance of class FalseClass and represents a logically false value in boolean expressions. The class provides operators allowing false to participate correctly in logical expressions.

Instance Method Summary collapse

Instance Method Details

#&(obj) ⇒ false #&(obj) ⇒ false

And---Returns false. obj is always evaluated as it is the argument to a method call---there is no short-circuit evaluation in this case.

Overloads:

  • #&(obj) ⇒ false

    Returns:

    • (false)
  • #&(obj) ⇒ false

    Returns:

    • (false) 



# File 'object.c'

/*
 *  call-seq:
 *     false & obj   -> false
 *     nil & obj     -> false
 *
 *  And---Returns <code>false</code>. <i>obj</i> is always
 *  evaluated as it is the argument to a method call---there is no
 *  short-circuit evaluation in this case.
 */

static VALUE
false_and(VALUE obj, VALUE obj2)
{
    return Qfalse;
}

#^(obj) ⇒ Boolean #^(obj) ⇒ Boolean

Exclusive Or---If obj is nil or false, returns false; otherwise, returns true.

Overloads:

  • #^(obj) ⇒ Boolean

    Returns:

    • (Boolean)
  • #^(obj) ⇒ Boolean

    Returns:

    • (Boolean) 



# File 'object.c'

/*
 *  call-seq:
 *     false ^ obj    -> true or false
 *     nil   ^ obj    -> true or false
 *
 *  Exclusive Or---If <i>obj</i> is <code>nil</code> or
 *  <code>false</code>, returns <code>false</code>; otherwise, returns
 *  <code>true</code>.
 *
 */

static VALUE
false_xor(VALUE obj, VALUE obj2)
{
    return RTEST(obj2)?Qtrue:Qfalse;
}

#to_s ⇒ Object

'nuf said...




# File 'object.c'

/*
 * call-seq:
 *   false.to_s   ->  "false"
 *
 * 'nuf said...
 */

static VALUE
false_to_s(VALUE obj)
{
    return rb_usascii_str_new2("false");
}

#|(obj) ⇒ Boolean #|(obj) ⇒ Boolean

Or---Returns false if obj is nil or false; true otherwise.

Overloads:

  • #|(obj) ⇒ Boolean

    Returns:

    • (Boolean)
  • #|(obj) ⇒ Boolean

    Returns:

    • (Boolean) 



# File 'object.c'

/*
 *  call-seq:
 *     false | obj   ->   true or false
 *     nil   | obj   ->   true or false
 *
 *  Or---Returns <code>false</code> if <i>obj</i> is
 *  <code>nil</code> or <code>false</code>; <code>true</code> otherwise.
 */

static VALUE
false_or(VALUE obj, VALUE obj2)
{
    return RTEST(obj2)?Qtrue:Qfalse;
}