multimap::empty (STL/CLR)

 

For the latest documentation on Visual Studio 2017 RC, see Visual Studio 2017 RC Documentation.

Tests whether no elements are present.

bool empty();  

The member function returns true for an empty controlled sequence. It is equivalent to multimap::size (STL/CLR)() == 0. You use it to test whether the multimap is empty.

// cliext_multimap_empty.cpp   
// compile with: /clr   
#include <cliext/map>   
  
typedef cliext::multimap<wchar_t, int> Mymultimap;   
int main()   
    {   
    Mymultimap c1;   
    c1.insert(Mymultimap::make_value(L'a', 1));   
    c1.insert(Mymultimap::make_value(L'b', 2));   
    c1.insert(Mymultimap::make_value(L'c', 3));   
  
// display contents " [a 1] [b 2] [c 3]"   
    for each (Mymultimap::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);   
    }  
  

 [a 1] [b 2] [c 3]  
size() = 3  
empty() = False  
size() = 0  
empty() = True  

Header: <cliext/map>

Namespace: cliext

multimap (STL/CLR)
multimap::size (STL/CLR)

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