SYNOPSIS
    mapping P_NOISES  "Noises"

    mapping Set(P_NOISES, mapping value)
    mapping Query(P_NOISES)
      or
    mapping SetNoises(mapping value)
    mapping QueryNoises()

      Accessible via:
    void AddNoise(string|string * id, string desc)
    void AddNoise(string|string * id, string * desc)
    void AddNoise(string|string * id, closure desc)
    void RemoveNoise(string|string * id)
    string|string* GetNoise(string id)

DESCRIPTION
    This property implements the noises of a room, i.e. things which
    can be listened to, but need not be represented with an own object.

    The value of the property is a mapping of the noise descriptions,
    with the id of each noise indexing its description.
    The description may be:
     - a single string with the description,
     - a closure returning the description string.
       The closure will be called with the id of the noise as
       argument.
    
    The noises cooperate with /std/room/description::DoExplore() to
    implement the explorer facilities.

    The noises should be accessed via AddNoise(), RemoveNoise() and
    GetNoise().

    string|string* GetNoise(string id)
      Return the description for noise <id>, or 0 if it isn't
      defined. This takes care of closure evaluation.

    void AddNoise(string|string * id, string desc)
      Add/redefine a noise <id> with the description <desc>.
      If an array of ids is given, each of the noises gets the same
      description (this is also valid for the other AddNoise()
      forms).

    void AddNoise(string|string * id, string * desc)
      Add/redefine a noise <id> with the description <desc>.
      <desc> is of the form ({ "#call_other", <object>, "functionname", ... }),
      which will be compiled into a closure and stored as such.

    void AddNoise(string|string * id, closure desc)
      Add/redefine a noise <id> with the closure <desc> returning the
      actual description.
	
    void RemoveNoise(string id)
      Remove the noise <id> if existing.

    void RemoveNoise(string * ids)
      Remove the noises <ids> if existing.

EXAMPLE
    // Add a noise to listen to.
    AddNoise("tree", "It's leafs rattle quietly in the wind.\n");

    // Add a noise to resolved by a local function 'theoak()'.
    AddNoise("oak", #'theoak);

    // Remove all the noises added above.
    RemoveNoise(({"tree", "oak"}));

AVAILABILITY
    Include: <properties.h>

    Availability: /std/room/(details), /std/npc and descendants.

SEE ALSO
    room(S), explorable(P), details(P), readmsgs(P), smells(P)