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#### Overview <a id="range.enumerate.overview">[[range.enumerate.overview]]</a>
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`enumerate_view` is a view whose elements represent both the position
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and value from a sequence of elements.
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The name `views::enumerate` denotes a range adaptor object. Given a
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subexpression `E`, the expression `views::enumerate(E)` is
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expression-equivalent to
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`enumerate_view<views::all_t<decltype((E))>>(E)`.
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[*Example 1*:
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``` cpp
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vector<int> vec{ 1, 2, 3 };
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for (auto [index, value] : views::enumerate(vec))
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cout << index << ":" << value << ' '; // prints 0:1 1:2 2:3
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```
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— *end example*]
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