iterator invalidation requirements differ, the complexity of insertion and erasure operations is linear. A flat set supports mostAssociativeContainer's operations that use unique keys. All member functions ofstd
Iterator Invalidation Scenarios Problem: Iterators, pointers, and references to a std::vector might be invalidated after certain operations, leading to undefined behavior. Example: std::vector<int> vec = {1, 2, 3}; auto it = vec.begin(); vec.push_back(4); std::cout << *it; // This...
首先,我们可以对其进行一定程度的简化: vector<string> collect_lines(istream& is) // collect unique lines from input{unordered_set s {from_range,istream_iterator<string>{is}); // initialize s from isreturn vector{from_range,s};}auto lines = collect_lines(cin); istream_iterator{is} 使我们...
ArrayList 的 get/set 函数 ArrayList 的 remove/clear/slice 函数 HashMap 的 get/put/contains 函数 HashMap 的 putAll/remove/clear 函数 HashSet 的 put/iterator/remove 函数 迭代器操作函数 std.collection.concurrent 包 接口 类 示例教程 ConcurrentHashMap 使用示例 NonBlockingQueue 使用示例...
Iterator invalidation Member function table Non-member function table std::flat_set Member types Member functions flat_set::flat_set flat_set::operator= Iterators flat_set::beginflat_set::cbegin flat_set::endflat_set::cend flat_set::rbeginflat_set::crbegin flat_set::rendflat_set::crend Capa...
Information on iterator invalidation is copied fromhere The iteratorposmust be valid and dereferenceable. Thus theend()iterator (which is valid, but is not dereferenceable) cannot be used as a value forpos. Parameters pos-iterator to the element to remove ...
However,std::unordered_setobjects generally cannot beconstexpr, because any dynamically allocated storage must be released in the same evaluation of constant expression. (since C++26) Iterator invalidation OperationsInvalidated All read only operations,swap,std::swapNever ...
vector<string> collect_lines(istream& is) // collect unique lines from input{unordered_set s {from_range,istream_iterator<string>{is}); // initialize s from isreturn vector{from_range,std::move(s)}; // move elements} 仍然存在的冗余拷贝是从输入缓冲区到 set 内部 string 元素的字符拷贝。
voidswap(set&other)noexcept(/* see below */); (since C++17) Exchanges the contents of the container with those ofother. Does not invoke any move, copy, or swap operations on individual elements. All iterators and references remain valid. Theend()iterator is invalidated. TheCompareobjects must...
Information on iterator invalidation is copied fromhere Parameters rg-acontainer compatible range, that is, aninput_rangewhose elements are convertible toT Return value (none) Complexity N+M·log(M), whereNissize()before the operation andMisranges::distance(rg). ...