Q:

The begin member returns an iterator that denotes the first element (or first character), if there is one

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The begin member returns an iterator that denotes the first element (or first character), if there is one.

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// the compiler determines the type of b and e; see § 2.5.2 (p. 68)
// b denotes the first element and e denotes one past the last element in v
auto b = v.begin(), e = v.end(); // b and e have the same type

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