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Adds wording that makes it clear that usually, replacing `std::endl` with `'\n'` is a good idea, but that there are rare cases, for instance when using `std::cout`, where flushing is important. An example of that encountered in practice that caused a bug when changing from `std::endl` to `'\n'` (not mentioned in the commit changes) is: Flushing `std::cout` (or some other stream that does not always automatically in all configurations flush upon `\n`), as part of checking assumptions and printing the results of checking, just before potentially crashing.
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Adds wording that makes it clear that usually, replacing
std::endlwith'\n'is a good idea, but that there are rare cases, for instance when usingstd::cout, where flushing is important.An example of that encountered in practice that caused a bug when changing from
std::endlto'\n'(not mentioned in the commit changes) is:Flushing
std::cout(or some other stream that does not always automatically in all configurations flush upon\n), as part of checking assumptions and printing the results of checking, just before potentially crashing.