constexpr bool binary_search( I first, S last, const T& value, Comp comp = {}, Proj proj = {} ); (since C++26) (2) template< ranges::forward_range R, class T, class Proj = std::identity, std::indirect_strict_weak_order <const T*, std::projected<ranges::iterator_t<R>,...
从C++20开始,使用ranges (#include <ranges>)。 //SAMPLE DATA std::vector<int> vecOfElements = { 2,4,6,8 }; //DO SOMETHING IF 8 IN VECTOR if (std::ranges::find(vecOfElements, 8) != vecOfElements.end()) { std::cout << "DO SOMETHING" << std::endl; } - Pavan Chandaka...
ranges::binary_search (C++20) determines if an element exists in a partially-ordered range (niebloid) ranges::includes (C++20) returnstrueif one sequence is a subsequence of another (niebloid) ranges::all_ofranges::any_ofranges::none_of ...
In this article, we are going to see C++ STL function binary_search() which uses the standard binary search algorithm to search an element within a range.
Binary search(operating on partitioned/sorted ranges): lower_bound Return iterator to lower bound (function template ) upper_bound Return iterator to upper bound (function template ) equal_range
= last; ++first) { if (std::invoke(proj, *first) == value) { return first; } } return first; } template< ranges::input_range R, class T, class Proj = std::identity > requires std::indirect_binary_predicate<ranges::equal_to, std::projected<ranges::iterator_t<R>, Proj>, const...
C++ 20ranges libraryさまざまなビューアダプタを含む、さまざまな要素を処理するためのコンポーネントを提供します。 Thestd::views::filter述語に一致する要素の範囲のビューを作成します。 次のコード例は、この関数の呼び出しを示しています。
#include <ranges> #include <vector> intmain(){ std::vector<int>vec{6,3,8,-9,1,-2,8}; inttarget=-9; automatch=vec|std::views::filter([&target](auto&v){ returnv==target; }); std::vector<int>matches{match.begin(),match.end()}; ...
tuple_element<> (std::ranges::subrange) (C++20 起)tuple_element<> (std::tuple) (C++11 起)tuple_element_t<> (C++14 起)tuple_size<> (C++11 起)tuple_size<> (std::array) (C++11 起)tuple_size<> (std::pair) (C++11 起)tuple_size<> (std::ranges::subrange) (C++20 起)tuple_...
与std::binary_search不同,std::lower_bound不要求operator<或comp不对称(即a<b和b<a的结果始终不同)。实际上,它甚至不要求value<*iter或comp(value,*iter)对于[first,last)中的任意迭代器iter良构。 功能特性测试宏值标准功能特性 __cpp_lib_algorithm_default_value_type202403(C++26)算法中的列表初始化(1...