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ios::xalloc

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static int xalloc();

Return Value

Provides extra ios object state variables without the need for class derivation. It does so by returning an index to an unused 32-bit word in an internal array. This index can subsequently be converted into a reference or pointer by using the iword or pword member functions.

Any call to xalloc invalidates values returned by previous calls to iword and pword.

ios Overview |  Abstract Stream Base Class

ios::iword, ios::pword