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std::deque::clear(3) C++ Standard Libary std::deque::clear(3) NAME std::deque::clear - std::deque::clear Synopsis void clear(); (noexcept since C++11) Erases all elements from the container. After this call, size() re- turns zero. Invalidates any references, pointers, and iterators referring to contained elements. Any past-the-end iterators are also invalidated. Parameters (none) Return value (none) Complexity Linear in the size of the container, i.e., the number of elements. Example // Run this code #include <iostream> #include <string_view> #include <deque> void print_info(std::string_view rem, const std::deque<int>& v) { std::cout << rem << "{ "; for (const auto& value : v) std::cout << value << ' '; std::cout << "}\n"; std::cout << "Size=" << v.size() << '\n'; } int main() { std::deque<int> container{1, 2, 3}; print_info("Before clear: ", container); container.clear(); print_info("After clear: ", container); } Output: Before clear: { 1 2 3 } Size=3 After clear: { } Size=0 Defect reports The following behavior-changing defect reports were applied retroac- tively to previously published C++ standards. DR Applied to Behavior as published Cor- rect behavior LWG 2231 C++11 complexity guarantee was mistakenly complex- ity reaffirmed as omitted in C++11 linear See also erase erases elements (public member function) http://cppreference.com 2024.06.10 std::deque::clear(3)
NAME | Synopsis | Parameters | Return value | Complexity | Example | Output: | See also
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