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Comment by iainmerrick | Hacker News Reader

What do you do if you really do intend the assignment?

(Assume for the sake of argument it’s some more reasonable example like "if (x = re_match(foo, bar)) {...}")

You wrap it in parens to avoid the warning: if ((x = 7)) { ... }

C++17 has if-statement initializers, so you can do

    if (auto x = re_match(foo, bar); x.has_value()) {

(or x.ok() or whatever the name is of the method that tells you the validity of x)

You do "if (((x = re_match(foo, bar))) {...}".

At least the systems I've seen need a extra (()) around = to disable the warnings and notify the reader that you're not just comparing for equality.