std::stack<T,Container>::empty
From cppreference.com
bool empty() const;
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Checks if the underlying container has no elements. Equivalent to: return c.empty().
Parameters
(none)
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());
}