Test whether container is empty
Returns whether the list container is empty, i.e. whether its size is 0.
This function does not modify the content of the container in any way. To clear the content of a list container, use list::clear.
Parameters
none
Return Value
true if the container size is 0, false otherwise.
Example
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// list::empty
#include <iostream>
#include <list>
using namespace std;
int main ()
{
list<int> mylist;
int sum (0);
for (int i=1;i<=10;i++) mylist.push_back(i);
while (!mylist.empty())
{
sum += mylist.front();
mylist.pop_front();
}
cout << "total: " << sum << endl;
return 0;
}
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The example initializes the content of the container to a sequence of numbers (form 1 to 10). It then pops the elements one by one until it is empty and calculates their sum.
Output:
Complexity
Constant.
See also
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