std::queue<T,Container>::empty
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
#include <cassert>
#include <queue>
int main()
{
std::queue<int> queue;
assert(queue.empty());
queue.push(42);
assert(!queue.empty());
queue.pop();
assert(queue.empty());
}
See also
| returns the number of elements (public member function) |
|
|
(C++17) | checks whether the container is empty (function template) |
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