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Jul 11, 2024 · Learn how to use std::upper_bound function in C++ to find the first element in a sorted range that is greater than a given value. See syntax, examples, and code snippets for different scenarios.
- Return Value
- Complexity
- Notes
- Defect Reports
Iterator to the first element of the range [first, last) ordered after value, or lastif no such element is found.
Given \(\scriptsize N\)N as std::distance(first, last): However, if ForwardIt is not a LegacyRandomAccessIterator, the number of iterator increments is linear in \(\scriptsize N\)N. Notably, std::map, std::multimap, std::set, and std::multiset iterators are not random access, and so their member upper_boundfunctions should be preferred.
Although std::upper_bound only requires [first, last) to be partitioned, this algorithm is usually used in the case where [first, last) is sorted, so that the binary search is valid for any value. For any iterator iter in [first, last), std::upper_bound requires value < *iter and comp(value, *iter) to be well-formed, while std::lower_bound requires...
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
Dec 13, 2014 · Learn how to use the upper_bound function template to find the first element in a range that compares greater than a given value. See the syntax, parameters, return value, complexity, examples and related functions.
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Mar 2, 2024 · Learn how to use std::upper_bound and std::lower_bound functions to find the first element in a vector that is greater than or equal to a given value. See examples, complexity, and header file for these functions.
Jan 31, 2017 · The simple answer is [ lower_bound, upper_bound ) s.lower_bound(t) will return iterator to the first element v in set such that v >= t s.upper_bound(t) will return iterator to the first element v in set such that v > t. When we often call xxxxx_bound for the STL set or map, we often want to find the data in some range.
Learn how to use std::upper_bound to find the first element in a range that is greater than or equal to a given value. See examples, syntax, and comparison with lower_bound and binary_search.
Nov 29, 2021 · std::map<Key,T,Compare,Allocator>:: upper_bound. 1,2) Returns an iterator pointing to the first element that is greater than key. 3,4) Returns an iterator pointing to the first element that compares greater to the value x. This overload participates in overload resolution only if the qualified-id Compare::is_transparent is valid and denotes a type.
