From Cppreference
Returns an unique index value that can be used to access elements in the two internal extensible arrays that each ios_base object has. One array holds elements of type long and can be accessed by iword(), another array holds elements of type void* and can be accessed by pword().
[edit] Parameters
(none)
[edit] Return value
index of the newly reserved element.
[edit] Example
[edit] See also
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accesses specified element in the internal extensible array of void* elements (public member function)
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accesses specified element in the internal extensible array of long elements (public member function)
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