bool empty() const;
|
||
Checks if the underlying container has no elements. Equivalent to: return c.empty().
Return value
true if the underlying container is empty, false otherwise.
Complexity
Constant.
Example
Run this code
#include <cassert>
#include <stack>
int main()
{
std::stack<int> stack;
assert(stack.empty());
stack.push(42);
assert(!stack.empty());
stack.pop();
assert(stack.empty());
}
See also
| returns the number of elements (public member function) | |
(C++17) |
checks whether the container is empty (function template) |