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diff --git a/libhello/hello.hxx b/libhello/hello.hxx
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+// file: libhello/hello.hxx -*- C++ -*-
+
+#pragma once
+
+#include <string>
+
+#include <libformat/format.hxx>
+
+#include <libhello/export.hxx>
+
+namespace hello
+{
+ // If you compare this interface to version 1.0, then you will notice that
+ // while it is API/source-compatible (the signature of say() is unchanged)
+ // it is not ABI/binary-compatible (say() is now inline).
+ //
+ // Notice also that inline say() calls format() which means libformat is an
+ // interface dependency of libhello.
+
+ LIBHELLO_EXPORT void
+ say_formatted (const std::string& message);
+
+ inline void
+ say (const std::string& name)
+ {
+ say_formatted (format ("Hello", name));
+ }
+}