Explain how make_shared (§ 12.1.1, p. 451) works.
§ 12.1.1 (p. 451)
Exercise 12.1
How many elements do b1 and b2 have at the end of this code?
StrBlob b1;{ StrBlob b2 = {"a", "an", "the"}; b1 = b2; b2.push_back("about");}Exercise 12.2
Write your own version of the StrBlob class including the const versions of front and back.
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