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std::vector::append_range(3) C++ Standard Libary std::vector::append_range(3) NAME std::vector::append_range - std::vector::append_range Synopsis template< container-compatible-range<T> R > (since C++23) constexpr void append_range( R&& rg ); Inserts copies of elements from the range rg before end(), in non- reversing order. If after the operation the new size() is greater than old capacity() a reallocation takes place, in which case all iterators (including the end() itera- tor) and all references to the elements are invalidated. Otherwise only the end() iterator is invalidated. Each iterator in rg is dereferenced exactly once. Parameters rg - a container compatible range, that is, an input_range whose elements are convertible to T Type requirements - T must be EmplaceConstructible into vector from *ranges::begin(rg). Also, T must be MoveInsertable into vector. Otherwise, the behavior is undefined. Return value (none) Complexity If reallocation happens, linear in the number of elements of the re- sulting vector; otherwise, linear in the number of elements inserted plus the dis- tance to the end(). Exceptions If an exception is thrown other than by the copy constructor, move constructor, assignment operator, or move assignment operator of T or by any In- putIterator operation there are no effects. If an exception is thrown while in- serting a single element at the end and T is CopyInsertable or std::is_nothrow_move_constructible_v<T> is true, there are no ef- fects. Otherwise, if an exception is thrown by the move constructor of a non-CopyIn- sertable T, the effects are unspecified. Notes Feature-test macro Value Std Feature __cpp_lib_containers_ranges 202202L (C++23) Ranges-aware construc- tion and insertion Example // Run this code #include <algorithm> #include <cassert> #include <vector> #include <list> int main() { auto head = std::vector{1, 2, 3, 4}; const auto tail = std::list{-5, -6, -7}; #ifdef __cpp_lib_containers_ranges head.append_range(tail); #else head.insert(head.end(), tail.cbegin(), tail.cend()); #endif assert(std::ranges::equal(head, std::vector{1, 2, 3, 4, -5, -6, -7})); } See also insert_range inserts a range of elements (C++23) (public member function) push_back adds an element to the end (public member function) emplace_back constructs an element in-place at the end (C++11) (public member function) http://cppreference.com 2024.06.10 std::vector::append_range(3)
NAME | Synopsis | Parameters | Type requirements | Return value | Complexity | Exceptions | Notes | Example | See also
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