begin()Used to implement the general overall construct--a distributed loop. Begins an enumeration of the elements of the range mapped to the local process. On exit from this member, the Location component of the index represents the first element of the local segment of the range
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If i is the loop index, the idiom for the loop is
for(i.begin() ; i.test() ; i.next())
S
The member test() is inherited from LocBlocksIndex (see section 7.2).
next()Move to next element in enumeration.