public member function
<unordered_map>
std::unordered_multimap::emptybool empty() const noexcept;
Test whether container is empty
Returns a bool value indicating whether the unordered_multimap container is empty, i.e. whether its size is 0.This function does not modify the content of the container in any way. To clear the content of an array object, member function unordered_multimap::clear exists.
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// unordered_multimap::empty
#include <iostream>
#include <unordered_map>
int main ()
{
std::unordered_multimap<int,int> first;
std::unordered_multimap<int,int> second = {{1,10},{2,20},{1,15}};
std::cout << "first " << (first.empty() ? "is empty" : "is not empty" ) << std::endl;
std::cout << "second " << (second.empty() ? "is empty" : "is not empty" ) << std::endl;
return 0;
}first is empty second is not empty
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