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    NS ENSURE TRUE

    Summary

    Macro

    Returns return-value if expr evaluates to false.

    Syntax

    NS_ENSURE_TRUE( expr, return-value );
    


    Usage

    nsresult mozMyClass::MozStringMucking()
    {
      char *foo = new char[123];
      NS_ENSURE_TRUE(foo, NS_ERROR_OUT_OF_MEMORY);
    
      // This is equivalent to doing:
      if (!foo)
        return NS_ERROR_OUT_OF_MEMORY;
    
      // Thou shalt not return NS_ERROR_FAILURE..
      int i = 3;
      NS_ENSURE_TRUE(i == 3, NS_ERROR_FAILURE);
    
      return NS_OK;
    }
    
    char* mozMyClass::DoStuff()
    {
      char* bar = new char[321];
      NS_ENSURE_TRUE(bar, nsnull);
      
      return bar;
    }
    

    Document Tags and Contributors

    Contributors to this page: Bastiaan Jacques
    Last updated by: Bastiaan Jacques,