Unary operators

The following unary operator functions are unsupported:

• Implementing the unary ~ operator as a non-member function with one parameter. Example:

     int operator ~(C &X) { return 1; }
  
     int tilda (C &X)     { return 1; }
  
     if (~c != tilda(c))
  
  ----------^----------------------------ERROR: Integer-operand expected
  

• Implementing the unary ! operator as a non-member function with one parameter. Example:

    class A{};
  
    int operator!(A &X) { return 1; }
  
    int bang_(A &X) { return 1; }
  
    A a;
  
    if ((!a) != (bang_(a))) 
  
  ---------^--------ERROR : Arithmetic type or pointer expected
  

• Logical OR operators are unsupported. Example:

  class X {
  
  public:
  
        operator int() {i = 1; return 1;}
  
  } x;
  
  (void) (0 || x); 
  
  -----------^------------ERROR 
  

• Conditional operators are unsupported. Example:

        int x = 1;
  
        int a = 2;
  
        int b = 3;
  
        x?a:b = 1;
  
  -------------^------------------ERROR
  

• Assignment operators are incorrectly implemented. Example:

        (i = 2) = 3;
  
  -------------^-------- The result of the = operator shall be an lvalue
  
        (i *= 2) = 3;
  
  -------------^-------- The result of the *= operator shall be an lvalue
  
        (i += 5) = 3;
  
  -------------^-------- The result of the += operator shall be an lvalue