On Sat, May 11, 2013 at 12:54 AM, Roy Smith <[email protected]> wrote:
> In article <[email protected]>,
> Chris Angelico <[email protected]> wrote:
>
>> On Sat, May 11, 2013 at 12:37 AM, Roy Smith <[email protected]> wrote:
>> > I suppose, if I had a class like this, I would write a factory function
>> > which called the constructor and post-construction initializer. And
>> > then I would make the constructor protected.
>>
>> That sounds like a reasonable plan, with the possible exception of
>> protected. Since meeting Python, I've stopped using private and
>> protected anywhere.
>>
>> ChrisA
>
> Each language has its own set of best practices. Trying to write C++
> code using Python patterns is as bad as trying to write Python code
> using C++ patterns.
Agreed, in generality. But what is actually gained by hiding data from
yourself? Compare:
class Foo
{
int asdf;
public:
Foo(int _asdf):asdf(_asdf) {}
int get_asdf() {return asdf;}
void set_asdf(int _asdf) {asdf=_asdf;}
void frob() {printf("Hi, I am %d\n",asdf);}
};
struct Foo
{
int asdf;
Foo(int _asdf):asdf(_asdf) {}
void frob() {printf("Hi, I am %d\n",asdf);}
};
Is there anything worse about the second one? Oh, and by logical
extension, here's something that doesn't (AFAIK) work in C++, but does
in another language that's syntactically similar:
class Foo(int asdf)
{
void frob() {write("Hi, I am %d\n",asdf);}
}
Now that's brevity. Why bother saying what's patently obvious? (Pike's
"class" keyword is like C++'s "struct", members are public by
default.)
ChrisA
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