EFUN: m_indices

SYNTAX:
mixed *m_indices( map );
  mapping map;

DESCRIPTION:
This efun extracts from each index:value pair elements of mapping 'map'
the index, and puts those in an array.

RETURN VALUE:
An array containing the indices of mapping 'map' is returned.

SEE ALSO:
mappingp
mkmapping
m_values
m_delete
m_sizeof

EXAMPLE:
mapping mp;
string *str;

mp = ([ "Angela":"female", "Marc":"male", "Maria":female" ]);
str = m_indices( mp );
// str is now ({ "Maria", "Angela", "Marc" }).
