C++ - Forward List operator<= Function
The C++ forward_list::operator<= function is used to check whether the first forward_list is less than or equal to the second forward_list or not. It returns true if the first forward_list is less than or equal to the second forward_list, else returns false. forward_list::operator<= compares elements of forward_lists sequentially and stops comparison after first mismatch.
Syntax
template <class T, class Alloc> bool operator<= (const forward_list<T,Alloc>& lhs, const forward_list<T,Alloc>& rhs);
Parameters
lhs |
First forward_list. |
rhs |
Second forward_list. |
Return Value
Returns true if the contents of lhs are lexicographically less than or equal to the contents of rhs, else returns false.
Time Complexity
Linear i.e, Θ(n).
Example:
In the below example, the forward_list::operator<= function is used to check whether the first forward_list is less than or equal to the second forward_list or not.
#include <iostream> #include <forward_list> using namespace std; int main (){ forward_list<int> f_list1 {10, 20, 30}; forward_list<int> f_list2 {10, 20}; forward_list<int> f_list3 {40, 50, 60}; if (f_list1 <= f_list2) cout<<"f_list1 is less than or equal to f_list2.\n"; else cout<<"f_list1 is not less than or equal to f_list2.\n"; if (f_list1 <= f_list3) cout<<"f_list1 is less than or equal to f_list3.\n"; else cout<<"f_list1 is not less than or equal to f_list3.\n"; return 0; }
The output of the above code will be:
f_list1 is not less than or equal to f_list2. f_list1 is less than or equal to f_list3.
❮ C++ - Forward List