std::stack<T,Container>::empty
Min standard notice:
Checks if the underlying container has no elements. Equivalent to: returnc.empty().
# Declarations
bool empty() const;
# Return value
true if the underlying container is empty, false otherwise.
# Example
#include <cassert>
#include <stack>
int main()
{
std::stack<int> stack;
assert(stack.empty());
stack.push(42);
assert(!stack.empty());
stack.pop();
assert(stack.empty());
}