Return iterator to lower bound (function template ) upper_bound Return iterator to upper bound (function template ) equal_range Get subrange of equal elements (function template )
std::ranges::binary_searchdoesn't return an iterator to the found element when an element whose projection equalsvalueis found. If an iterator is desired,std::ranges::lower_boundshould be used instead. Feature-testmacroValueStdFeature __cpp_lib_algorithm_default_value_type202403(C++26)List-init...
template <classForwardIterator,classT>boolbinary_search ( ForwardIterator first, ForwardIterator last,constT&value ); template<classForwardIterator,classT,classCompare>boolbinary_search ( ForwardIterator first, ForwardIterator last,constT& value, Compare comp ); 可以看到binary_search的迭代器是前向迭代...
template<class InputIt> typename std::iterator_traits<InputIt>::value_type reduce(InputIt first, InputIt last); template<class InputIt, class T> T reduce(InputIt first, InputIt last, T init); template<class InputIt, class T, class BinaryOperation> T reduce(InputIt first, InputIt last,...
std::binary_search 在排序的vector中进行二分查找; std::binary_search(v.begin(),v.end(),v.element_type_obj,compare); std::unique 将排序的vector vector<element_type>::iterator iter = std::unique(v.begin(),v.end(),compare); v.resize(iter-v.begin()); ...
> #include <iomanip> #include <iostream> #include <iterator> #include <string_view> #include <vector> using namespace std::literals; bool contains(const auto& cont, std::string_view s) { // str.find() (or str.contains(), since C++23) can be used as well return std::search(cont...
ptr; } bool operator==(const FaultyIterator& other) const { return ptr == other.ptr; } private: const int* ptr; bool fail_after; int count; }; int main() { int arr[] = {1, 2, 2, 2, 3}; try { auto it = std::search_n( FaultyIterator(arr, true), FaultyIterator(arr +...
std::search_n的两个版本定义如下: 为了使用==比较元素: 语法如下: ForwardIterator search_n (ForwardIterator first, ForwardIterator last, Size count, const T& val); first: Forward iterator to beginning of the container to be searched into. last: Forward iterator to end of the container to be...
#include<string>#include<algorithm>#include<iostream>#include<vector>template<typename Container>boolin_quote(constContainer&cont,conststd::string&s){returnstd::search(cont.begin(),cont.end(),s.begin(),s.end())!=cont.end();}intmain(){std::string str="why waste time learning, when ignora...
然而,对于非遗留随机访问迭代器 (LegacyRandomAccessIterator) ,迭代次自增次数为线性。 可能的实现 版本一 template<class ForwardIt, class T> std::pair<ForwardIt,ForwardIt> equal_range(ForwardIt first, ForwardIt last, const T& value) { return std::make_pair(std::lower_bound(first, last, ...