Question

How to check whether a container is empty in C++ 17

Answer 1

#include <iostream>
#include <vector>
 
template <class T>
void print(const T& container) {
    if ( !std::empty(container) ) {
         for ( const auto& element : container )
             std::cout << element << ", ";
    }
    else  {
        std::cout << "Empty\n";
    }
    std::cout << '\n';
}
 
int main() 
{
    std::vector<int> v = { 5, 3, 1, 8, 2 };
    v.clear();
    print(v);
 
    int arr[] = { 9, 3, 1, 2 };
    print(arr);
 
    auto lst = { 7, 1, 6, 2, 4, 8 };
    print(lst);
}
 


 
/*
run:
 
Empty

9, 3, 1, 2, 
7, 1, 6, 2, 4, 8, 
 
*/

 

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