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difference between foldLeft and reduceLeft in Scala
...ere is the signature of foldLeft (could also have been foldRight for the point I'm going to make):
def foldLeft [B] (z: B)(f: (B, A) => B): B
And here is the signature of reduceLeft (again the direction doesn't matter here)
def reduceLeft [B >: A] (f: (B, A) => B): B
These two look ve...
Inspecting standard container (std::map) contents with gdb
... Note: the std::map functionality in these scripts assumes 32-bit pointer types. For 64-bit machines, replace "+ 4" to "+ 8" everywhere in the file.
– Kyle Simek
May 20 '12 at 20:22
...
Remove Fragment Page from ViewPager in Android
...ted by this answer, I found that the solution is to override the getItemId(int position) method of FragmentPagerAdapter to give a new unique ID whenever there has been a change in the expected position of a Fragment.
Source Code:
private class MyPagerAdapter extends FragmentPagerAdapter {
pri...
Why does this code using random strings print “hello world”?
The following print statement would print "hello world".
Could anyone explain this?
15 Answers
...
How to lock orientation during runtime
...nfiguration returns and what setRequestedOrientation wants - they are both int, but they are coming from different constant definitions.
Here's how to lock the current orientation, while allowing 180 degree flips
int currentOrientation = getResources().getConfiguration().orientation;
if (currentOr...
Sorting a vector of custom objects
...
A simple example using std::sort
struct MyStruct
{
int key;
std::string stringValue;
MyStruct(int k, const std::string& s) : key(k), stringValue(s) {}
};
struct less_than_key
{
inline bool operator() (const MyStruct& struct1, const MyStruct& struct2)...
How to insert a character in a string at a certain position?
I'm getting in an int with a 6 digit value. I want to display it as a String with a decimal point (.) at 2 digits from the end of int . I wanted to use a float but was suggested to use String for a better display output (instead of 1234.5 will be 1234.50 ). Therefore, I need a function t...
Is String.Format as efficient as StringBuilder
...may no longer apply to later versions.
String.Format uses a StringBuilder internally:
public static string Format(IFormatProvider provider, string format, params object[] args)
{
if ((format == null) || (args == null))
{
throw new ArgumentNullException((format == null) ? "format" :...
To ARC or not to ARC? What are the pros and cons? [closed]
...W, make sure to use of Xcode to do the transition (Edit > Refactor > Convert to Objective-C ARC). During the process Xcode would do a lot of validation to make sure your code would work and figure out any codes that violates those designing guidelines.
– ZhangChn
...
When is assembly faster than C?
...
Here is a real world example: Fixed point multiplies on old compilers.
These don't only come handy on devices without floating point, they shine when it comes to precision as they give you 32 bits of precision with a predictable error (float only has 23 bit and ...