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What is a serialVersionUID and why should I use it?
... read
Unnecessary code: Redundant null check
Unnecessary code: Unnecessary cast or 'instanceof'
and many more.
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Why does an overridden function in the derived class hide other overloads of the base class?
... interface. So maybe d->foo() won't get you the "Is-a Base", but static_cast<Base*>(d)->foo() will, including dynamic dispatch.
– Kerrek SB
Jan 9 '14 at 13:36
12
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SQL WHERE.. IN clause multiple columns
...te that if your columns are numeric, some SQL dialects will require you to cast them to strings first. I believe SQL server will do this automatically.
To wrap things up: As usual there are many ways to do this in SQL, using safe choices will avoid suprises and save you time and headaces in the l...
GSON throwing “Expected BEGIN_OBJECT but was BEGIN_ARRAY”?
...u don't. You have an array of objects of your type. You can't just try and cast the result like that and expect it to magically work ;)
The User guide for Gson Explains how to deal with this:
https://github.com/google/gson/blob/master/UserGuide.md
This will work:
ChannelSearchEnum[] enums = gson...
Is there a wikipedia API just for retrieve content summary?
...
@LaurynasG You can cast the object to an array and then grab it like this: $extract = current((array)$json_query->query->pages)->extract
– MarcGuay
Mar 15 '16 at 21:57
...
Just what is an IntPtr exactly?
...sic pointer arithmetic.
In order to dereference an IntPtr, you can either cast it to a true pointer (an operation which can only be performed in "unsafe" contexts) or you can pass it to a helper routine such as those provided by the InteropServices.Marshal class. Using the Marshal class gives the i...
How to create id with AUTO_INCREMENT on Oracle?
...r replace trigger FOO_trg
before insert on FOO
for each row
begin
select cast(sys_guid() as varchar2(32)) into :new.x from dual; -- string version
-- select sys_guid() into :new.x from dual; -- raw version
end;
/
update:
Oracle 12c introduces these two variants that don't...
What is the difference between gravity and layout_gravity in Android?
...y;
...
Button button = (Button) findViewById(R.id.MyButtonId);
// need to cast to LinearLayout.LayoutParams to access the gravity field
LayoutParams params = (LayoutParams)button.getLayoutParams();
params.gravity = Gravity.BOTTOM;
button.setLayoutParams(params);
For horizontal LinearLayout conta...
Populate data table from data reader
...lumn. lines in the dtSchema foreach loop because it said it was an illegal cast to bool on (bool)drow["IsUnique"]. I didn't need them, getting the column names in order to populate the new DataTable is enough. This managed to help me overcome a ds.Fill(adapter) issue where I could not load a large t...
What is the equivalent of the C# 'var' keyword in Java?
...), don't forget that non-virtual methods are affected by the Type they are cast as.
I can't imagine a real world scenario where this is indicative of good design, but this may not work as you expect:
class Foo {
public void Non() {}
public virtual void Virt() {}
}
class Bar : Foo {
pu...