[cfe-dev] Is there a string format class which act like DiagnosticBuilder?

[Yafei Liu via cfe-dev]

It's very convenient to define a diagnostic syntax and use operator << to
add parameters.

I'm currently doing some code generation jobs and want to use the grammar
which is used in defining diagnostic errors, some sort like this:
StringStream << "class '%0' : %select{public|private}1 '%2'" << "Foo" << 0
<< "Bar" << std::endl;

Is there any code to do this?
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