hash_multimap::empty (STL/CLR)
Überprüft, ob keine Elemente vorhanden sind.
bool empty();
Hinweise
Die Memberfunktion gibt true für eine leere gesteuerte Sequenz zurück.Es ist zu hash_multimap::size (STL/CLR)() == 0.Sie verwenden sie, um zu testen, ob das hash_multimap leer ist.
Beispiel
// cliext_hash_multimap_empty.cpp
// compile with: /clr
#include <cliext/hash_map>
typedef cliext::hash_multimap<wchar_t, int> Myhash_multimap;
int main()
{
Myhash_multimap c1;
c1.insert(Myhash_multimap::make_value(L'a', 1));
c1.insert(Myhash_multimap::make_value(L'b', 2));
c1.insert(Myhash_multimap::make_value(L'c', 3));
// display contents " [a 1] [b 2] [c 3]"
for each (Myhash_multimap::value_type elem in c1)
System::Console::Write(" [{0} {1}]", elem->first, elem->second);
System::Console::WriteLine();
System::Console::WriteLine("size() = {0}", c1.size());
System::Console::WriteLine("empty() = {0}", c1.empty());
// clear the container and reinspect
c1.clear();
System::Console::WriteLine("size() = {0}", c1.size());
System::Console::WriteLine("empty() = {0}", c1.empty());
return (0);
}
Anforderungen
Header: <cliext/hash_map>
Namespace: cliext