[cfe-users] Convert DefaultArg to string

[Wang Qi]

Hi all,

I want to get a function's default parameter value as string. That's to
say, if a function "void func(int a = 5);", I want to get the string "5".
I checked ParmVarDecl, but found it only returns an Expr as the default arg.

So my question is, how to get a default parameter value as string, or how
to convert an Expr to string?

Thanks
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