Is TCHAR still relevant?

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The short answer: NO.

Like all the others already wrote, a lot of programmers still use TCHARs and the corresponding functions. In my humble opinion the whole concept was a bad idea. UTF-16 string processing is a lot different than simple ASCII/MBCS string processing. If you use the same algorithms/functions with both of them (this is what the TCHAR idea is based on!), you get very bad performance on the UTF-16 version if you are doing a little bit more than simple string concatenation (like parsing etc.). The main reason are Surrogates.

With the sole exception when you really have to compile your application for a system which doesn’t support Unicode I see no reason to use this baggage from the past in a new application.

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