C#

public struct AtomicInt
{
  Int32 m_value;
  public static AtomicInt operator++ (AtomicInt ai) 
  { 
    Interlocked.Increment(ref ai.m_value);
    return ai;
  }
    
  public override string ToString()
  {
    return m_value.ToString();
  }
}

...

AtomicInt ai = new AtomicInt();

Console.WriteLine(ai);    // ->0
Console.WriteLine(++ai);  // ->1
Console.WriteLine(ai++);  // ->1
Console.WriteLine(ai);    // ->2

public struct AtomicInt
{  
  Int32 m_value;  
  
  public AtomicInt(Int32 value)
  {
    m_value = value;
  }
  
  public static AtomicInt operator++ (AtomicInt ai)   
  {     
    int i = Interlocked.Increment(ref ai.m_value);
    return new AtomicInt(i);  
  }
  
  public override string ToString()  
  {    
    return m_value.ToString();  
  }
}

AtomicInt x; <br />
++x;<br />

<br />
AtomicInt x;<br />
x = AtmicInt.op_Increment(x);<br />

Guffa wrote:

A struct should generally be immutable

Kusumasrinivas wrote:

Is it possible to generate the encrypted string(output of maximum 15 characters) of fixed length using Rijndael encryption or any other symmetric algorithm?