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Showing content from https://cplusplus.com/reference/ios/ios_base/xalloc/ below:

public static member function

std::ios_base::xalloc

Get new index for extensible array [static]

Returns a new index value to be used with member functions in the internal extensible array.

The internal extensible array is a general-purpose array of objects of type long (if accessed with member iword) or void* (if accessed with member pword).

This is a static member function.

Parameters none

Return Value A new index that can be used with either member iword or member pword.

Data races Concurrently calling this function may introduce data races.

Exception safetyStrong guarantee: if an exception is thrown, there are no changes in any stream.

See also

ios_base::iword: Get integer element of extensible array (public member function)

ios_base::pword: Get pointer element of extensible array (public member function)

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