std::forward_list::operator=
From cppreference.com
< cpp | container | forward list
forward_list& operator=( const forward_list& other ); |
(1) | (since C++11) |
forward_list& operator=( forward_list&& other ); |
(2) | (since C++11) |
Replaces the contents of the container.
1) Copy assignment operator. Replaces the contents with a copy of the contents of other.
2) Move assignment operator. Replaces the contents with those of other using move semantics (i.e. the data in other is moved from other into this container).
Contents |
[edit] Parameters
other | - | another container to be used as source |
[edit] Return value
*this
[edit] Complexity
1) Linear in the size of the container.
2) Constant.
[edit] Example
The following code uses to assign one std::forward_list to another:
#include <iterator> #include <forward_list> #include <iostream> void display_sizes(const std::forward_list<int> &nums1, const std::forward_list<int> &nums2, const std::forward_list<int> &nums3) { std::cout << "nums1: " << std::distance(nums1.begin(), nums1.end()) << " nums2: " << std::distance(nums2.begin(), nums2.end()) << " nums3: " << std::distance(nums3.begin(), nums3.end()) << '\n'; } int main() { std::forward_list<int> nums1 {3, 1, 4, 6, 5, 9}; std::forward_list<int> nums2; std::forward_list<int> nums3; std::cout << "Initially:\n"; display_sizes(nums1, nums2, nums3); // copy assignment copies data from nums1 to nums2 nums2 = nums1; std::cout << "After assigment:\n"; display_sizes(nums1, nums2, nums3); // move assignment moves data from nums1 to nums3, // modifying both nums1 and nums3 nums3 = std::move(nums1); std::cout << "After move assigment:\n"; display_sizes(nums1, nums2, nums3); }
Output:
Initially: nums1: 4 nums2: 0 nums3: 0 After assigment: nums1: 4 nums2: 4 nums3: 0 After move assigment: nums1: 0 nums2: 4 nums3: 4
[edit] See also
constructs the forward_list (public member function) | |
assigns values to the container (public member function) |