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#### 22 projection <a id="defns.projection">[[defns.projection]]</a>
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⟨function object argument⟩ transformation that an algorithm applies
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before inspecting the values of elements
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[*Example 1*:
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``` cpp
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std::pair<int, std::string_view> pairs[] = {{2, "foo"}, {1, "bar"}, {0, "baz"}};
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std::ranges::sort(pairs, std::ranges::less{}, [](auto const& p) { return p.first; });
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```
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sorts the pairs in increasing order of their `first` members:
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``` cpp
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{{0, "baz"}, {1, "bar"}, {2, "foo"}}
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```
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— *end example*]
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