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Post C++11 you can just do (like this:)), no extra space needed before the last parenthesis.

But then it looks like I'm using a double smiley[0] which I do actually use on occasion

[0] :))

You could use a bracket in the smiley (like this :]) as is sometimes used when nesting parentheticals.

I sometimes do the opposite and use brackets for the parentheticals [like this :)]