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Tomás
Guest
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 Posted: Mon May 15, 2006 8:21 pm Post subject: The name of constructors and destructors |
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A good programmer strives to make their code as easily changeable as
possible. For instance, instead of writing:
int * const p = static_cast<int*>( malloc( 500 * sizeof(int) ) );
They will replace "sizeof(int)" with "sizeof(*p)", so that the code can
adapt as effortlessly as possible.
| Quote: | From when I first learned C++, I couldn't see the logic in giving classes'
constructors and destructor the same name as the class. Let's say we have a |
class which has 23 member functions, 7 constructors, and a destructor. If we
have a change of heart and want to rename our class from "Chimpanzee" to
"Chimp", then a lot of "Find and Replace" is necessary.
The following is superior:
class Monkey {
public:
Constructor()
{
}
Destructor()
{
}
};
It also would not result in the peculiarity seen in the following code:
#include <string>
using std::string;
typedef string Monkey;
int main()
{
char mem_block[ sizeof(Monkey) ];
Monkey &monkey = *new(mem_block) Monkey;
monkey.~Monkey();
monkey.~string();
/* Also: */
string str;
str.~Monkey();
}
-Tomás
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Tomás
Guest
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| Posted: Mon May 15, 2006 10:21 pm Post subject: Re: The name of constructors and destructors |
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|
"Tomás" posted:
| Quote: | class Monkey {
public:
Constructor()
|
For even more adaptability, there could have been a "Class" keyword, which
could be a typedef for the class itself. It can implemented manually
though:
class Monkey {
public:
typedef Monkey Class;
Constructor( const Class& original ); /* Copy Constructor */
};
Now if the class's name changes, there's even less maintenance.
-Tomás
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Nevin \":-]\" Liber
Guest
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| Posted: Tue May 16, 2006 6:21 am Post subject: Re: The name of constructors and destructors |
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In article <m94ag.9208$j7.305481 (AT) news (DOT) indigo.ie>,
NULL (AT) NULL (DOT) NULL ("Tom?s") wrote:
| Quote: | A good programmer strives to make their code as easily changeable as
possible. For instance, instead of writing:
int * const p = static cast<int*>( malloc( 500 * sizeof(int) ) );
They will replace "sizeof(int)" with "sizeof(*p)", so that the code can
adapt as effortlessly as possible.
|
And if the type changes to something with non-trivial construction or
destruction, this construct allows you to introduce a bug "as
effortlessly as possible."
Unless you have special requirements, there are better alternatives to
malloc. Consider:
int p[500];
std::vector<int> const vi(500);
int* const p = &vi[0];
int* const p = new int[500];
| Quote: | From when I first learned C++, I couldn't see the logic in giving classes'
constructors and destructor the same name as the class. Let's say we have a
class which has 23 member functions, 7 constructors, and a destructor. If we
have a change of heart and want to rename our class from "Chimpanzee" to
"Chimp", then a lot of "Find and Replace" is necessary.
|
Unless this class is totally unused, you'll have a lot of "Find and
Replace" necessary at all the call sites. With seven different
constructors declared, I'd expect a class like this to already have been
used a lot.
| Quote: | It also would not result in the peculiarity seen in the following code:
#include <string
using std::string;
typedef string Monkey;
int main()
{
char mem block[ sizeof(Monkey) ];
Monkey &monkey = *new(mem block) Monkey;
monkey.~Monkey();
monkey.~string();
/* Also: */
string str;
str.~Monkey();
}
|
In most code, placement new is a rare thing. Do you observe otherwise?
--
Nevin " " Liber <mailto:nevin (AT) eviloverlord (DOT) com> (773) 961-1620
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