C++ <list> size Function
sizeIs one of the most commonly used functions in list, used toGet the number of elements in the linked list。
sizeIs a member function of container classes, used to return the number of elements currently contained in the linked list.
Unlike vector, list'ssize()Usually completes in O(1) time.
Word Definitions： sizeMeans "size", indicating the number of elements in the linked list.
Basic syntax and parameters
Syntax format
size_type size() const;
Function description
- Return Value: returns the number of elements in the linked list (
size_type）。
Example
Example 1: Get the size of the linked list
Example
#include <iostream>
#include <list>
int main() {
std::list<int> empty;
std::cout << "Empty linked list size: " << empty.size() << std::endl;
std::list<int> numbers = {1, 2, 3, 4, 5};
std::cout << 5-element linked list size: << numbers.size() << std::endl;
numbers.push_back(6);
std::cout << size after adding: << numbers.size() << std::endl;
return 0;
}
#include <list>
int main() {
std::list<int> empty;
std::cout << "Empty linked list size: " << empty.size() << std::endl;
std::list<int> numbers = {1, 2, 3, 4, 5};
std::cout << 5-element linked list size: << numbers.size() << std::endl;
numbers.push_back(6);
std::cout << size after adding: << numbers.size() << std::endl;
return 0;
}
Expected execution result:
空链表 size: 0 5元素链表 size: 5 添加后 size: 6
other extensions