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#### Overview <a id="range.filter.overview">[[range.filter.overview]]</a>
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`filter_view` presents a `view` of the elements of an underlying
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sequence that satisfy a predicate.
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The name `views::filter` denotes a range adaptor object
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[[range.adaptor.object]]. Given subexpressions `E` and `P`, the
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expression `views::filter(E, P)` is expression-equivalent to
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`filter_view{E, P}`.
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[*Example 1*:
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``` cpp
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vector<int> is{ 0, 1, 2, 3, 4, 5, 6 };
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filter_view evens{is, [](int i) { return 0 == i % 2; }};
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for (int i : evens)
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cout << i << ' '; // prints: 0 2 4 6
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```
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— *end example*]
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