[streambuf.reqts] (original) (raw)

Each sequence is characterized by three pointers which, if non-null, all point into the samecharTarray object.

The array object represents, at any moment, a (sub)sequence of characters from the sequence.

Operations performed on a sequence alter the values stored in these pointers, perform reads and writes directly to or from associated sequences, and alter “the stream position” and conversion state as needed to maintain this subsequence relationship.

The three pointers are:

• thebeginning pointer, or lowest element address in the array (called xbeg here);
• thenext pointer, or next element address that is a current candidate for reading or writing (called xnext here);
• theend pointer, or first element address beyond the end of the array (called xend here).