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Why are mutable structs “evil”?
...d not any other copies which might be around.
If your struct is immutable then all automatic copies resulting from being passed by value will be the same.
If you want to change it you have to consciously do it by creating a new instance of the struct with the modified data. (not a copy)
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jQuery set radio button
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If there are multiple radios with the cols name then $('input:radio[name="cols"]').attr('checked', 'checked'); will select just the last one. It will run the code on each, but every-time you set the checked property, the previously set element gets unset. Here's a demo: js...
How to negate a method reference predicate
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@SaintHill but then you have to write it out, giving the parameter a name
– flup
Feb 28 '15 at 15:50
21
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Changing git commit message after push (given that no one pulled from remote)
... if you want to wipe out the old message and use a new one.)
Pushing
And then when you push, do this:
git push --force-with-lease <repository> <branch>
Or you can use "+":
git push <repository> +<branch>
Or you can use --force:
git push --force <repository> <...
Java ResultSet how to check if there are any results
...ointing to before the first row, if the first call to next() returns false then there was no data in the ResultSet.
If you use this method, you may have to call beforeFirst() immediately after to reset it, since it has positioned itself past the first row now.
It should be noted however, that Seif...
Xcode iOS project only shows “My Mac 64-bit” but not simulator or device
... project :
Go to "Product" from upper menu
Select "Scheme" from the list
Then select "Manage Scheme"
Now no matter your "Project Name" is listed here or not just click on "Autocreate Schemes Now" from the upper-right side of the window.
Press "ok", now your project rebuild and you can find the "Si...
How to use onSavedInstanceState example please
...r started for the first time is:
if (savedInstanceState != null) {
// Then the application is being reloaded
}
To get the data back out, use the get* functions just like the put* functions. The data is stored as a name-value pair. This is like a hashmap. You provide a key and the value, then ...
Why do we need boxing and unboxing in C#?
... So, what you do is this: you make a new object that can store the int and then you assign a reference to that object to o. We call this process "boxing."
So, if you don't care about having a unified type system (i.e., reference types and value types have very different representations and you don...
GetManifestResourceStream returns NULL
...lad to have helped! If you feel that this post has answered your question, then please don't forget to mark this as the accepted answer.
– Jay
Feb 8 '14 at 8:26
1
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Parse v. TryParse
...ely implemented is that internally the Parse method will call TryParse and then throw an exception if it returns false.
In a nutshell, use Parse if you are sure the value will be valid; otherwise use TryParse.
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