hash_set::empty (STL/CLR)

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Tests whether no elements are present.

Syntax

bool empty();  

Remarks

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

Example

// cliext_hash_set_empty.cpp   
// compile with: /clr   
#include <cliext/hash_set>   
  
typedef cliext::hash_set<wchar_t> Myhash_set;   
int main()   
    {   
    Myhash_set c1;   
    c1.insert(L'a');   
    c1.insert(L'b');   
    c1.insert(L'c');   
  
// display initial contents " a b c"   
    for each (wchar_t elem in c1)   
        System::Console::Write(" {0}", elem);   
    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 b c  
size
() = 3  
empty
() = False  
size
() = 0  
empty
() = True  

Requirements

Header: <cliext/hash_set>

Namespace: cliext

See Also

hash_set (STL/CLR)
hash_set::size (STL/CLR)