SYNOPSIS
        int sizeof(mixed * val)
        int sizeof(string  val)
        int sizeof(mapping val)

DESCRIPTION
        Returns the number of elements of an array, the number of characters
        in a string, or the number of keys in a mapping.

        As a special case, the number 0 can be passed, and the function
        will return 0.

        Note: this efun is also available under the name 'm_sizeof(E)'.
        Usage of that name however is deprecated.

HISTORY
        LDMud 3.2.9 added strings to the possible parameters.

SEE ALSO
        strlen(E), allocate(E), pointerp(E),
        mappingp(E), m_allocate(E), widthof(E)