SYNOPSIS
    mixed P_NOBUY  "NoBuy"

    mixed Set(P_NOBUY, mixed value)
    mixed Query(P_NOBUY)
      or
    mixed SetNoBuy(mixed value)
    mixed QueryNoBuy()

DESCRIPTION
    If the value is zero, the thing can be sold to a shop, if it
    is non-zero, it can't be sold.
    If the value is a string, the string is printed as failure message on such
    an attempt.

EXAMPLE
    Set(P_NOBUY, "It's too worthy to be sold.\n");

AVAILABILITY
    Include: <properties.h>

    Availability: /std/thing(/description) and descendants.

SEE ALSO
    thing(S), nosell(P)