std::flat_set<Key,Compare,KeyContainer>::operator=
From cppreference.com
flat_set& operator=( const flat_set& other ); |
(1) | (since C++23) (implicitly declared) |
flat_set& operator=( flat_set&& other ); |
(2) | (since C++23) (implicitly declared) |
flat_set& operator=( std::initializer_list<key_type> ilist ); |
(3) | (since C++23) |
Replaces the contents of the container adaptor with the contents of given argument.
1) Copy assignment operator. Replaces the contents with a copy of the contents of
other. Effectively calls c = other.c; comp = other.comp;.2) Move assignment operator. Replaces the contents with those of
other using move semantics. Effectively calls c = std::move(other.c); comp = std::move(other.comp);.3) Replaces the contents with those identified by initializer list
ilist.Parameters
| other | - | another container adaptor to be used as source |
| ilist | - | initializer list to be used as source |
Return value
*this
Complexity
1,2) Equivalent to that of
operator= of the underlying
container.3) Linear in the size of
*this and ilist.Example
Run this code
#include <flat_set>
#include <initializer_list>
#include <print>
int main()
{
std::flat_set<int> x{1, 2, 3}, y, z;
const auto w = {4, 5, 6, 7};
std::println("Initially:");
std::println("x = {}", x);
std::println("y = {}", y);
std::println("z = {}", z);
y = x; // overload (1)
std::println("Copy assignment copies data from x to y:");
std::println("x = {}", x);
std::println("y = {}", y);
z = std::move(x); // overload (2)
std::println("Move assignment moves data from x to z, modifying both x and z:");
std::println("x = {}", x);
std::println("z = {}", z);
z = w; // overload (3)
std::println("Assignment of initializer_list w to z:");
std::println("w = {}", w);
std::println("z = {}", z);
}
Output:
Initially:
x = {1, 2, 3}
y = {}
z = {}
Copy assignment copies data from x to y:
x = {1, 2, 3}
y = {1, 2, 3}
Move assignment moves data from x to z, modifying both x and z:
x = {}
z = {1, 2, 3}
Assignment of initializer_list w to z:
w = {4, 5, 6, 7}
z = {4, 5, 6, 7}
See also
constructs the flat_set (public member function) | |
| replaces the underlying container (public member function) |