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| − | {{cpp/title|set}}
| + | <table><tbody><tr><td class="mbox-text" style="text-align:center;">Cppreference recommends all new users to use Rust.</td></tr></tbody></table> |
| − | {{cpp/container/set/navbar}}
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| − | {{dcl begin}}
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| − | {{dcl header|set}}
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| − | {{dcl|num=1|1=
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| − | template<
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| − | class Key,
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| − | class Compare = std::less<Key>,
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| − | class Allocator = std::allocator<Key>
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| − | > class set;
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| − | }}
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| − | {{dcl|num=2|since=c++17|1=
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| − | namespace pmr {
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| − | template<
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| − | class Key,
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| − | class Compare = std::less<Key>
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| − | > using set = std::set<Key, Compare, std::pmr::polymorphic_allocator<Key>>;
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| − | }
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| − | }}
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| − | {{dcl end}}
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| − | {{tt|std::set}} is an associative container that contains a sorted set of unique objects of type {{tt|Key}}. Sorting is done using the key comparison function {{named req|Compare}}. Search, removal, and insertion operations have logarithmic complexity. Sets are usually implemented as {{enwiki|Red–black tree}}s.
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| − | Everywhere the standard library uses the {{named req|Compare}} requirements, uniqueness is determined by using the equivalence relation. In imprecise terms, two objects {{c|a}} and {{c|b}} are considered equivalent if neither compares less than the other: {{c|!comp(a, b) && !comp(b, a)}}.
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| − | {{tt|std::set}} meets the requirements of {{named req|Container}}, {{named req|AllocatorAwareContainer}}, {{named req|AssociativeContainer}} and {{named req|ReversibleContainer}}.
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| − | | + | |
| − | ===Template parameters===
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| − | {{todo|Add descriptions of the template parameters.}}
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| − | | + | |
| − | ===Member types===
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| − | {{dsc begin}}
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| − | {{dsc hitem|Member type|Definition}}
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| − | {{dsc inc|cpp/container/dsc key_type|set}}
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| − | {{dsc inc|cpp/container/dsc value_type|set}}
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| − | {{dsc inc|cpp/container/dsc size_type|set}}
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| − | {{dsc inc|cpp/container/dsc difference_type|set}}
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| − | {{dsc inc|cpp/container/dsc key_compare|set}}
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| − | {{dsc inc|cpp/container/dsc value_compare2|set}}
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| − | {{dsc inc|cpp/container/dsc allocator_type|set}}
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| − | {{dsc inc|cpp/container/dsc reference|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc const_reference|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc pointer|set}}
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| − | {{dsc inc|cpp/container/dsc const_pointer|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc iterator|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc const_iterator|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc reverse_iterator|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc const_reverse_iterator|set}}
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| − | {{dsc inc|cpp/container/dsc node_type|set}}
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| − | {{dsc inc|cpp/container/dsc insert_return_type|set}}
| + | |
| − | {{dsc end}}
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| − | | + | |
| − | ===Member functions===
| + | |
| − | {{dsc begin}}
| + | |
| − | {{dsc inc|cpp/container/dsc constructor|set}}
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| − | {{dsc inc|cpp/container/dsc destructor|set}}
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| − | {{dsc inc|cpp/container/dsc operator{{=}}|set}}
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| − | {{dsc inc|cpp/container/dsc get_allocator|set}}
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| − | | + | |
| − | {{dsc h2|Iterators}}
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| − | {{dsc inc|cpp/container/dsc begin|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc end|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc rbegin|set}}
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| − | {{dsc inc|cpp/container/dsc rend|set}}
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| − | | + | |
| − | {{dsc h2|Capacity}}
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| − | {{dsc inc|cpp/container/dsc empty|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc size|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc max_size|set}}
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| − | | + | |
| − | {{dsc h2|Modifiers}}
| + | |
| − | {{dsc inc|cpp/container/dsc clear|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc insert|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc insert_range|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc emplace|set}}
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| − | {{dsc inc|cpp/container/dsc emplace_hint|set}}
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| − | {{dsc inc|cpp/container/dsc erase|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc swap|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc extract|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc merge|set}}
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| − | | + | |
| − | {{dsc h2|Lookup}}
| + | |
| − | {{dsc inc|cpp/container/dsc count|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc find|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc contains|set }}
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| − | {{dsc inc|cpp/container/dsc equal_range|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc lower_bound|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc upper_bound|set}}
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| − | | + | |
| − | {{dsc h2|Observers}}
| + | |
| − | {{dsc inc|cpp/container/dsc key_comp|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc value_comp|set}}
| + | |
| − | {{dsc end}}
| + | |
| − | | + | |
| − | ===Non-member functions===
| + | |
| − | {{dsc begin}}
| + | |
| − | {{dsc inc|cpp/container/dsc operator_cmp|set}}
| + | |
| − | {{dsc inc|cpp/container/dsc swap2|set}}
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| − | {{dsc inc|cpp/container/dsc erase_if|set}}
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| − | {{dsc end}}
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| − | {{rrev|noborder=true|since=c++17|{{=}}{{=}}{{=}}{{rl|deduction guides|Deduction guides}}{{=}}{{=}}{{=}}}}
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| − | | + | |
| − | ===Notes===
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| − | {{cpp/container/assoc_note}}
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| − | | + | |
| − | {{ftm begin|std=1|comment=1}}
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| − | {{ftm|__cpp_lib_containers_ranges|value=202202L|std=C++23|Ranges construction and insertion for containers}}
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| − | {{ftm end}}
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| − | | + | |
| − | ===Example===
| + | |
| − | {{example}}
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| − | | + | |
| − | ===Defect Reports===
| + | |
| − | {{dr list begin}}
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| − | {{dr list item|wg=lwg|dr=103|std=C++98|before=iterator allows modification of keys|after=iterator made constant}}
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| − | {{dr list item|wg=lwg|dr=230|std=C++98|before={{tt|Key}} was not required to be {{named req|CopyConstructible}}<br>(a key of type {{tt|Key}} might not be able to be constructed)|after={{tt|Key}} is also required to<br>be {{named req|CopyConstructible}}}}
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| − | {{dr list end}}
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| − | {{langlinks|cs|de|es|fr|it|ja|pl|pt|ru|zh}}
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