CB> There are a few parts of C++ that confuse me, and I was wondering if
CB> 1) the ? : thing
CB> an example I spotted in a message in here: 
CB> regs.x.bx == 0xffff ? 2 : regs.x.bx
This is actually a C thing.
The expression
condition ? e1 : e2
evaluates  to  what  the  sub-expression  e1 evaluates to if condition
evaluates to  non-zero  (true)  and  to  what  the  sub-expression  e2
evaluates to if condition evaluates to zero (false).
The function
int max(int i1, int i2)
{
    return i1>i2 ? i1 : i2;
}
returns i1 if i1>i2 and i2 otherwise.
CB> 2) templates
Templates are used to parametrize functions and classes.
Making  the  above  max  function  a template allows it to be used for
other types of parameters, provided that an appropriate  operator>  is
defined:
template 
T max(T t1, T t2)
{
    return t1>t2 ? t1 : t2;
}
void foo()
{
    int i1 = 3,
        i2 = 17;
    int im = max(i1,i2); 
        // instantiates and calls int max(int,int)
    double d1 = 3.1,
           d2 = 4;
    double dm = max(d1,d2);
        // instantiates and calls double max(double,double)
}
There's  a  lot  more  to  be written about templates. This is not the
appropriate place for that. Read a book.
CB> 3) deriving classes
If you write
class A
{
}
class B : public A
{
};
you define a class B which is (publicly) derived from class A.
There's a lot more to be written about class derivation  and  what  it
allows:  inheritance, polymorphism. This is not thhe appropriate place
for that. Read a book.
Thomas
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 þ MM 1.0 #0113 þ I can't remember if I used to know that.
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