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Showing content from http://en.cppreference.com/w/cpp/language/attributes/../../container/stack/empty.html below:

std::stack<T,Container>::empty - cppreference.com

Checks if the underlying container has no elements. Equivalent to: return c.empty().

[edit] Parameters

(none)

[edit] Return value

true if the underlying container is empty, false otherwise.

[edit] Complexity

Constant.

[edit] 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());
}
[edit] See also returns the number of elements
(public member function) [edit] checks whether the container is empty
(function template) [edit]

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