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What is an “unwrapped value” in Swift?
...pe basically means that the variable can be nil.
Example:
var canBeNil : Int? = 4
canBeNil = nil
The question mark indicates the fact that canBeNil can be nil.
This would not work:
var cantBeNil : Int = 4
cantBeNil = nil // can't do this
To get the value from your variable if it is optional,...
What's the point of const pointers?
I'm not talking about pointers to const values, but const pointers themselves.
17 Answers
...
private final static attribute vs private final attribute
...new Test();
x.instanceVariable = 10;
y.instanceVariable = 20;
System.out.println(x.instanceVariable);
prints out 10: y.instanceVariable and x.instanceVariable are separate, because x and y refer to different objects.
You can refer to static members via references, although it's a bad idea to do s...
Android TextWatcher.afterTextChanged vs TextWatcher.onTextChanged
...nts are called in the following order:
beforeTextChanged(CharSequence s, int start, int count, int after).
This means that the characters are about to be replaced with some new text. The text is uneditable.
Use: when you need to take a look at the old text which is about to change.
onTextChanged(C...
How to pick an image from gallery (SD Card) for my app?
...ter solution is to simply use context.getContentResolver().openInputStream(intent.getData()), as that will return an InputStream that you can handle as you choose.
For example, BitmapFactory.decodeStream() works perfectly in this situation, as you can also then use the Options and inSampleSize fie...
Android: I am unable to have ViewPager WRAP_CONTENT
...of the biggest child it currently has.
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
int height = 0;
for(int i = 0; i < getChildCount(); i++) {
View child = getChildAt(i);
child.measure(widthMeasureSpec, MeasureSpec.makeMeasureSpec(0, ...
How do I sort one vector based on values of another
...for each x
sort(order(y)[x]) #sorts by that order
y[sort(order(y)[x])] #converts orders back to numbers from orders
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Is int[] a reference type or a value type?
I know an int is a value type, but what are arrays of value types? Reference types? Value types? I want to pass an array to a function to check something. Should I just pass the array, as it will just pass the reference of it, or should I pass it as ref?
...
汇编语言超浓缩教程（汇编入门必备） - C/C++ - 清泛网 - 专注C/C++及内核技术
...前面所提的寄存器外，还有一些特殊功能的寄存器：IP（Intruction Pointer）：指令指针寄存器，与CS配合使用，可跟踪程序的执行过程；SP（Stack Pointer）：堆栈指针，与SS配合使用，可指向目前的堆栈位置。BP（Base Pointer）：基址指...
程序员之网络安全系列（三）：数据加密之对称加密算法 - 更多技术 - 清泛网...
...ed = AES_Encrypt(bytesToBeEncrypted, passwordBytes);
string result = Convert.ToBase64String(bytesEncrypted);
return result;
}
public static string DecryptText(string input, string password)
{
// Get the bytes of the string
byte[] bytesToBeDecrypted = Convert.FromBase64...