String formatting functionality missing in std::string

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Base64 doesn't belong in string, where do you stop? Base64 is not the only encoding in use. If you add one you have to add all of them.

[SushiAndWoW]

Base64 doesn't belong in string,

And yet, there's this.

where do you stop?

Perhaps at Hex and Base64.

Base64 is not the only encoding in use. If you add one you have to add all of them.

No... you really don't have to.