const objects (like in C++) in C#
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Is there any better way to have C++-like const objects in C# than coding all checks by yourself?
I know, I can do this:
readonly Whatever a = new Whatever();
But that just stops you from reassigning a, it doesnt stop you from changing a:
a = new Whatever(); // nope
a.some_property = 5; // still possible, if property exists and has a setter
I dont want all Whatevers be constant (in the c-meaning), I just want some ones.
The tedious approach would be this:
public class Whatever
{
private bool _isConst;
private int _some_property = 0;
public Whatever(isConst = false)
{
_isConst = isConst;
}
public int some_property
{
get {return _some_property;}
set
{
if (_isConst)
Debug.Assert(" ... ");
_some_property = value;
}
}
}
Is there any better way to do this?
As the comments suggest that I didnt make myself very clear:
In C++ and in C#:
*const -> readonly
#DEFINE -> const
const(*) -> ???
c# c++ const readonly
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
|
show 8 more comments
0
Is there any better way to have C++-like const objects in C# than coding all checks by yourself?
I know, I can do this:
readonly Whatever a = new Whatever();
But that just stops you from reassigning a, it doesnt stop you from changing a:
a = new Whatever(); // nope
a.some_property = 5; // still possible, if property exists and has a setter
I dont want all Whatevers be constant (in the c-meaning), I just want some ones.
The tedious approach would be this:
public class Whatever
{
private bool _isConst;
private int _some_property = 0;
public Whatever(isConst = false)
{
_isConst = isConst;
}
public int some_property
{
get {return _some_property;}
set
{
if (_isConst)
Debug.Assert(" ... ");
_some_property = value;
}
}
}
Is there any better way to do this?
As the comments suggest that I didnt make myself very clear:
In C++ and in C#:
*const -> readonly
#DEFINE -> const
const(*) -> ???
c# c++ const readonly
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
1
@preciousbetine: no, you cant doconst Whatever a = new Whatever();
– rhavin
Nov 23 '18 at 18:39
2
With properties you can declare public get {} private set {}. Is that good enough?
– Wyck
Nov 23 '18 at 19:01
1
@Wyck No: "I dont want all Whatevers be constant (in the c-meaning), I just want some ones."
– rhavin
Nov 23 '18 at 19:05
1
Just stop treating C# like it is C++, it doesn't get you very far. const in C++ has awful warts with const_cast<> and mutable and no actual enforcement at runtime and a significant number of programmers that gave up on it because they couldn't figure it out. It was intentionally left out of the CLR and C#. Lots of C# programmers live happily without out. Well, all of them :)
– Hans Passant
Nov 23 '18 at 19:56
1
@HansPassant A surprising statement to me, but coming from you it must have merit. In my book const was a good thing, enforceability or not, because it states the programmer's intention. "FYI only." It's all the more important in a language like C# that passes almost everything (sans atomic and other trivial types) by reference, and lacks proper "copy constructor" support at the same time.
– Peter A. Schneider
Nov 23 '18 at 20:08
|
show 8 more comments
0
0
0
Is there any better way to have C++-like const objects in C# than coding all checks by yourself?
I know, I can do this:
readonly Whatever a = new Whatever();
But that just stops you from reassigning a, it doesnt stop you from changing a:
a = new Whatever(); // nope
a.some_property = 5; // still possible, if property exists and has a setter
I dont want all Whatevers be constant (in the c-meaning), I just want some ones.
The tedious approach would be this:
public class Whatever
{
private bool _isConst;
private int _some_property = 0;
public Whatever(isConst = false)
{
_isConst = isConst;
}
public int some_property
{
get {return _some_property;}
set
{
if (_isConst)
Debug.Assert(" ... ");
_some_property = value;
}
}
}
Is there any better way to do this?
As the comments suggest that I didnt make myself very clear:
In C++ and in C#:
*const -> readonly
#DEFINE -> const
const(*) -> ???
c# c++ const readonly
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
Is there any better way to have C++-like const objects in C# than coding all checks by yourself?
I know, I can do this:
readonly Whatever a = new Whatever();
But that just stops you from reassigning a, it doesnt stop you from changing a:
a = new Whatever(); // nope
a.some_property = 5; // still possible, if property exists and has a setter
I dont want all Whatevers be constant (in the c-meaning), I just want some ones.
The tedious approach would be this:
public class Whatever
{
private bool _isConst;
private int _some_property = 0;
public Whatever(isConst = false)
{
_isConst = isConst;
}
public int some_property
{
get {return _some_property;}
set
{
if (_isConst)
Debug.Assert(" ... ");
_some_property = value;
}
}
}
Is there any better way to do this?
As the comments suggest that I didnt make myself very clear:
In C++ and in C#:
*const -> readonly
#DEFINE -> const
const(*) -> ???
c# c++ const readonly
c# c++ const readonly
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
edited Nov 23 '18 at 19:02
rhavin
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
asked Nov 23 '18 at 18:25
rhavinrhavin
6741627
6741627
1
@preciousbetine: no, you cant doconst Whatever a = new Whatever();
– rhavin
Nov 23 '18 at 18:39
2
With properties you can declare public get {} private set {}. Is that good enough?
– Wyck
Nov 23 '18 at 19:01
1
@Wyck No: "I dont want all Whatevers be constant (in the c-meaning), I just want some ones."
– rhavin
Nov 23 '18 at 19:05
1
Just stop treating C# like it is C++, it doesn't get you very far. const in C++ has awful warts with const_cast<> and mutable and no actual enforcement at runtime and a significant number of programmers that gave up on it because they couldn't figure it out. It was intentionally left out of the CLR and C#. Lots of C# programmers live happily without out. Well, all of them :)
– Hans Passant
Nov 23 '18 at 19:56
1
@HansPassant A surprising statement to me, but coming from you it must have merit. In my book const was a good thing, enforceability or not, because it states the programmer's intention. "FYI only." It's all the more important in a language like C# that passes almost everything (sans atomic and other trivial types) by reference, and lacks proper "copy constructor" support at the same time.
– Peter A. Schneider
Nov 23 '18 at 20:08
|
show 8 more comments
1
@preciousbetine: no, you cant doconst Whatever a = new Whatever();
– rhavin
Nov 23 '18 at 18:39
2
With properties you can declare public get {} private set {}. Is that good enough?
– Wyck
Nov 23 '18 at 19:01
1
@Wyck No: "I dont want all Whatevers be constant (in the c-meaning), I just want some ones."
– rhavin
Nov 23 '18 at 19:05
1
Just stop treating C# like it is C++, it doesn't get you very far. const in C++ has awful warts with const_cast<> and mutable and no actual enforcement at runtime and a significant number of programmers that gave up on it because they couldn't figure it out. It was intentionally left out of the CLR and C#. Lots of C# programmers live happily without out. Well, all of them :)
– Hans Passant
Nov 23 '18 at 19:56
1
@HansPassant A surprising statement to me, but coming from you it must have merit. In my book const was a good thing, enforceability or not, because it states the programmer's intention. "FYI only." It's all the more important in a language like C# that passes almost everything (sans atomic and other trivial types) by reference, and lacks proper "copy constructor" support at the same time.
– Peter A. Schneider
Nov 23 '18 at 20:08
1
1
@preciousbetine: no, you cant do
const Whatever a = new Whatever();– rhavin
Nov 23 '18 at 18:39
@preciousbetine: no, you cant do
const Whatever a = new Whatever();– rhavin
Nov 23 '18 at 18:39
2
2
With properties you can declare public get {} private set {}. Is that good enough?
– Wyck
Nov 23 '18 at 19:01
With properties you can declare public get {} private set {}. Is that good enough?
– Wyck
Nov 23 '18 at 19:01
1
1
@Wyck No: "I dont want all Whatevers be constant (in the c-meaning), I just want some ones."
– rhavin
Nov 23 '18 at 19:05
@Wyck No: "I dont want all Whatevers be constant (in the c-meaning), I just want some ones."
– rhavin
Nov 23 '18 at 19:05
1
1
Just stop treating C# like it is C++, it doesn't get you very far. const in C++ has awful warts with const_cast<> and mutable and no actual enforcement at runtime and a significant number of programmers that gave up on it because they couldn't figure it out. It was intentionally left out of the CLR and C#. Lots of C# programmers live happily without out. Well, all of them :)
– Hans Passant
Nov 23 '18 at 19:56
Just stop treating C# like it is C++, it doesn't get you very far. const in C++ has awful warts with const_cast<> and mutable and no actual enforcement at runtime and a significant number of programmers that gave up on it because they couldn't figure it out. It was intentionally left out of the CLR and C#. Lots of C# programmers live happily without out. Well, all of them :)
– Hans Passant
Nov 23 '18 at 19:56
1
1
@HansPassant A surprising statement to me, but coming from you it must have merit. In my book const was a good thing, enforceability or not, because it states the programmer's intention. "FYI only." It's all the more important in a language like C# that passes almost everything (sans atomic and other trivial types) by reference, and lacks proper "copy constructor" support at the same time.
– Peter A. Schneider
Nov 23 '18 at 20:08
@HansPassant A surprising statement to me, but coming from you it must have merit. In my book const was a good thing, enforceability or not, because it states the programmer's intention. "FYI only." It's all the more important in a language like C# that passes almost everything (sans atomic and other trivial types) by reference, and lacks proper "copy constructor" support at the same time.
– Peter A. Schneider
Nov 23 '18 at 20:08
|
show 8 more comments
0
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1
@preciousbetine: no, you cant do
const Whatever a = new Whatever();– rhavin
Nov 23 '18 at 18:39
2
With properties you can declare public get {} private set {}. Is that good enough?
– Wyck
Nov 23 '18 at 19:01
1
@Wyck No: "I dont want all Whatevers be constant (in the c-meaning), I just want some ones."
– rhavin
Nov 23 '18 at 19:05
1
Just stop treating C# like it is C++, it doesn't get you very far. const in C++ has awful warts with const_cast<> and mutable and no actual enforcement at runtime and a significant number of programmers that gave up on it because they couldn't figure it out. It was intentionally left out of the CLR and C#. Lots of C# programmers live happily without out. Well, all of them :)
– Hans Passant
Nov 23 '18 at 19:56
1
@HansPassant A surprising statement to me, but coming from you it must have merit. In my book const was a good thing, enforceability or not, because it states the programmer's intention. "FYI only." It's all the more important in a language like C# that passes almost everything (sans atomic and other trivial types) by reference, and lacks proper "copy constructor" support at the same time.
– Peter A. Schneider
Nov 23 '18 at 20:08