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...;s no easy way to add compile time checking of format strings until C++14, regardless of whether use UDLs or not. So that doesn't change either way. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20161013/40637f49/attachment.html>

You get compile time checking automatically when we can use c++14 though. If you use it with a string literal, you'll get compile time checking, otherwise you won't. Here's a different example though. Suppose you're writing a tool which prints formatted output, and the field width is specified by the user. Now you NEED to build the format string at runtime, there's no other