array::empty() in C++ STL
Last Updated :
26 Mar, 2018
Array classes are generally more efficient, light-weight and reliable than C-style arrays. The introduction of array class from C++11 has offered a better alternative for C-style arrays.
array::empty()
empty() function is used to check if the array container is empty or not.
Syntax :
arrayname.empty()
Parameters :
No parameters are passed.
Returns :
True, if array is empty
False, Otherwise
Examples:
Input : myarray{1, 2, 3, 4, 5};
myarray.empty();
Output : False
Input : myarray{};
myarray.empty();
Output : True
Errors and Exceptions
1. It has a no exception throw guarantee.
2. Shows error when a parameter is passed.
#include <array>
#include <iostream>
using namespace std;
int main()
{
array< int , 5> myarray{ 1, 2, 3, 4 };
if (myarray.empty()) {
cout << "True" ;
}
else {
cout << "False" ;
}
return 0;
}
|
Output :
False
#include <array>
#include <iostream>
using namespace std;
int main()
{
array< int , 0> myarray;
if (myarray.empty()) {
cout << "True" ;
}
else {
cout << "False" ;
}
return 0;
}
|
Output :
True
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