Talk:cpp/io/ios base/xalloc

In the description: Returns a unique (program-wide) index value that can be used to access one long and one void* elements in the private storage of std::ios_base by calling iword and pword.

Maybe it should be:

Returns a unique index value "operating system process-wide" / "address space-wide" on shared "static storage" ...

I can imagine "program" comprising one "shared object" / "DLL" or more "shared objects" / "DLLS" operating on one "address space" ? "program" is too general term ?

Thank you

vlakov--193.58.194.195 20:31, 4 June 2014 (PDT)


 * "program" is a specific term, it's the result of translation. I suppose this can say 'static' instead. --Cubbi (talk) 21:32, 4 June 2014 (PDT)

Multiple indices in example
I don't understand why, in the example, every template instance of  has its own index. Isn't the whole point of  to return a program-wide value, as mentioned in the first paragraph? Why would you use different indices here? The only reason I can think of is multiple inheritance, but I don't think that would be a good idea anyway (mixing different character or character traits types). Electrolisk (talk) 04:52, 9 March 2020 (PDT)


 * not "every template instance", but "every template specialization". The example demonstrates how to get every mystream use one index and every mystream use another. It's not strictly needed for the specific use demonstrated in the example (which doesn't distinguish between char and wchar_t mystreams), but it's a typical pattern for this construct. --Cubbi (talk) 06:00, 9 March 2020 (PDT)