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std::unique_lock or std::lock_guard?
...ricted version with a limited interface.
A lock_guard always holds a lock from its construction to its destruction. A unique_lock can be created without immediately locking, can unlock at any point in its existence, and can transfer ownership of the lock from one instance to another.
So you always...
How to get the list of files in a directory in a shell script?
...lain me a bit? In particular what is the -i echo "{}" part do? Also I read from the man page that -i is deprecated now and we should use -I insted.
– drkg4b
Oct 5 '15 at 17:27
1
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How to add dividers and spaces between items in RecyclerView?
...lication to add a special drawing and layout offset to specific item views from the adapter's data set. This can be useful for drawing dividers between items, highlights, visual grouping boundaries and more.
All ItemDecorations are drawn in the order they were added, before the item views (in onDraw...
Why is processing a sorted array faster than processing an unsorted array?
...less.
Further reading: "Branch predictor" article on Wikipedia.
As hinted from above, the culprit is this if-statement:
if (data[c] >= 128)
sum += data[c];
Notice that the data is evenly distributed between 0 and 255. When the data is sorted, roughly the first half of the iterations will no...
What are the complexity guarantees of the standard containers?
... O(n)
vector<T> v(begin, end); Make a vector and copy the elements from begin to end. O(n)
Accessors
v[i] Return (or set) the I'th element. O(1)
v.at(i) Return (or set) the I'th element, with bounds checking. O(1)
v.size() Return current numb...
C++ unordered_map using a custom class type as the key
...p; third == other.third);
}
};
Here is a simple hash function (adapted from the one used in the cppreference example for user-defined hash functions):
namespace std {
template <>
struct hash<Key>
{
std::size_t operator()(const Key& k) const
{
using std::size...
What are forward declarations in C++?
...tise to always forward declare and include headers as needed in .cpp file? From reading your answer it would appear it should be so, but I'm wondering if there's any caveats?
– Zepee
Feb 11 '15 at 19:28
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Should I put #! (shebang) in Python scripts, and what form should it take?
...thon 2 and Python 3. Otherwise, it should point to the appropriate choice from python2 and python3.
– amiller27
Jan 19 '17 at 3:50
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Checking for NULL pointer in C/C++ [closed]
...e language is much simpler and reliance on the pre-processor more common.
From this perspective I'd probably recommend using the NULL macro definition in C.
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What is the purpose of a self executing function in javascript?
...ght solve our problem. Everything is now enclosed and can only be accessed from within our opening and closing braces.
We have a function in a function... which is weird to look at, but totally legal.
Only one problem. Our code doesn't work.
Our userName variable is never echoed into the console! ...