cppreference.com 创建账户 页面 讨论 变换 查看 编辑 历史 std::setC++ 容器库 std::set 在标头 <set> 定义 template< class Key, class Compare = std::less<Key>, class Allocator = std::allocator<Key> > class set; (1) namespace pmr { template< class Key, class Compare = std::...
__cpp_lib_constexpr_set202502L(C++26)constexprstd::set Example Run this code #include <algorithm>#include <iomanip>#include <iostream>#include <iterator>#include <set>#include <string_view>template<typenameT>std::ostream&operator<<(std::ostream&out,conststd::set<T>&set){if(set.empty()...
cppreference.com Create account Page Discussion Standard revision: View Edit History std::erase_if (std::set)C++ Containers library std::set Defined in header <set> template< class Key, class Compare, class Alloc,class Pred > std::set<Key, Compare, Alloc>::size_type erase_if( std::set...
__cpp_lib_containers_ranges202202L(C++23)Ranges-awareconstruction and insertion; overloads(12,13) Example Run this code #include <cmath>#include <iostream>#include <set>#include <string>structPoint{doublex, y;};structPointCmp{booloperator()(constPoint&lhs,constPoint&rhs)const{returnstd::hyp...
(a key of type Key might not be able to be constructed) Key is also required tobe CopyConstructible © cppreference.comLicensed under the Creative Commons Attribution-ShareAlike Unported License v3.0. https://en.cppreference.com/w/cpp/container/set ...
std::set::contains boolcontains(constKey&key)const; (1)(since C++20) template<classK>boolcontains(constK&x)const; (2)(since C++20) 1)Checks if there is an element with key equivalent tokeyin the container. 2)Checks if there is an element with key that comparesequivalentto the valuex...
() << " ms for " << what << '\n'; } } int test_set_cppreference() { { // constructor: constructs the set // (1) Default constructor std::set<std::string> a; a.insert("cat"); a.insert("dog"); a.insert("horse"); for (auto& str : a) std::cout << str << ' ...
从cppreference.com 在std::set::lower_bound: 返回值 指向不 小于 key的第一个元素的迭代器。如果没有找到这样的元素,则返回一个过去的迭代器(参见 end())。 在您的情况下,由于您的集合中没有不小于(即大于或等于)11 的元素,因此返回一个结束迭代器并将其分配给 it_l 。然后在你的行中: std::cout ...
API Reference Document std::setC++ 容器库 std::set 定义于头文件 <set> template< class Key, class Compare = std::less<Key>, class Allocator = std::allocator<Key> > class set; (1) namespace pmr { template <class Key, class Compare = std::less<Key>> using set = std::set<Key...
Allocator::reference (C++11 前) value_type& (C++11 起) const_reference Allocator::const_reference (C++11 前) const value_type& (C++11 起) pointer Allocator::pointer (C++11 前) std::allocator_traits<Allocator>::pointer (C++11 起) const_pointer Allocator::const_pointer (C++11 前) st...