public member function
<set>
bool empty() const noexcept;
Test whether container is empty
Returns whether the multiset container is empty (i.e. whether its size is 0).
This function does not modify the container in any way. To clear the content of a multiset container, see multiset::clear.
Return Value
true if the container size is 0, false otherwise.
Example
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// multiset::empty
#include <iostream>
#include <set>
int main ()
{
std::multiset<int> mymultiset;
mymultiset.insert(10);
mymultiset.insert(20);
mymultiset.insert(10);
std::cout << "mymultiset contains:";
while (!mymultiset.empty())
{
std::cout << ' ' << *mymultiset.begin();
mymultiset.erase(mymultiset.begin());
}
std::cout << '\n';
return 0;
}
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Output:
mymultiset contains: 10 10 20
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Iterator validity
No changes.
Data races
The container is accessed.
Concurrently accessing the elements of a multiset is safe.
Exception safety
No-throw guarantee: this member function never throws exceptions.