C# Language Proposal for 'out' Parameters
From: C# Learner (csharp_at_learner.here)
Date: 04/10/04
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Date: Sat, 10 Apr 2004 08:04:15 +0100
Note
----
Please use a fixed-width font to view this, such as Courier New.
Problem
-------
When passing a parameter with the modifier 'out', it is necessary to
write two statements:
- one for the declaration of the variable due to receive the value; and
- one for the method call, where the variable is passed as a parameter.
Example:
static void Main()
{
int i;
if (TryGetValue(out i)) {
Console.WriteLine("Value is: {0}.", i);
}
}
This is inconsistent with the traditional way of returning values from a
method.
Example:
static void Main()
{
int i = GetValue();
Console.WriteLine("Value is: {0}.", i);
}
Solution
--------
The solution to this problem would be to allow the declaration of the
variable to appear within the statment where it's being passed as an
'out' parameter.
Example:
static void Main()
{
if (TryGetValue(out int i)) {
Console.WriteLine("Value is: {0}.", i);
}
}
Benefits
--------
(a) Method bodies can benefit from one less statement for each time this
technique is used, promoting readability.
(b) C# becomes more consistent since returning values using both the
traditional way, and using 'out' parameters, is uniform. Again,
this promotes readability.
Example:
// traditional way
static void Main()
{
int i = GetANumber();
DoSomethingWith(i);
}
// using an 'out' parameter, with the aforementioned syntax
static void Main()
{
if (TryGetANumber(out int i)) {
DoSomethingWith(i);
}
}
End
---
Comments?
Regards,
C. S. Learner
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- Maybe reply: Bruno Jouhier [MVP]: "Re: C# Language Proposal for 'out' Parameters"
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