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Fastest hash for non-cryptographic uses?
...e others.
<?php
set_time_limit(720);
$begin = startTime();
$scores = array();
foreach(hash_algos() as $algo) {
$scores[$algo] = 0;
}
for($i=0;$i<10000;$i++) {
$number = rand()*100000000000000;
$string = randomString(500);
foreach(hash_algos() as $algo) {
$start =...
How do I choose grid and block dimensions for CUDA kernels?
...nGridSize, &blockSize, MyKernel, 0, N);
// Round up according to array size
gridSize = (N + blockSize - 1) / blockSize;
cudaEventRecord(stop, 0);
cudaEventSynchronize(stop);
cudaEventElapsedTime(&time, start, stop);
printf("Occupancy calculator elapsed time: %3....
List changes unexpectedly after assignment. How do I clone or copy it to prevent this?
...y
[['foo'], [], []]
>>> l
[['foo'], [], []]
The list is just an array of pointers to the contents, so a shallow copy just copies the pointers, and so you have two different lists, but they have the same contents. To make copies of the contents, you need a deep copy.
Deep copies
To make ...
How to access property of anonymous type in C#?
...s type too. The easiest way to do this is to project a sequence such as an array into a list, e.g.
var nodes = (new[] { new { Checked = false, /* etc */ } }).ToList();
Then you'll be able to access it like:
nodes.Any(n => n.Checked);
Because of the way the compiler works, the following then...
Integrating the ZXing library directly into my Android application
...final String NOTE_KEY = "NOTE_KEY";
// When using Type.CONTACT, these arrays provide the keys for adding or retrieving multiple phone numbers and addresses.
public static final String[] PHONE_KEYS = {
ContactsContract.Intents.Insert.PHONE, ContactsContract.Intents.Insert.SECONDA...
What is uint_fast32_t and why should it be used instead of the regular int and uint32_t?
...d be aligned and the like: but, it will use more memory. If you have large arrays of these your program will be slower due to more memory cache hits and bandwidth.
I don't think modern CPUS will benefit from fast_int32, since generally the sign extending of 32 to 64 bit can happen during the load ...
Why does calling a method in my derived class call the base class method?
...al methods, the compiler will generate
a v-table. This is essentially an array that contains the addresses of
the virtual methods. Every object that has a virtual method will
contain a hidden member generated by the compiler that is the address
of the v-table. When a virtual function is call...
Is a `=default` move constructor equivalent to a member-wise move constructor?
...d/moved in the manner appropriate to its type:
if the member is an array, each element is direct-initialized with the corresponding subobject of x;
if a member m has rvalue reference type T&&, it is direct-initialized with static_cast(x.m);
otherwise, the base or member is direct...
What is hashCode used for? Is it unique?
...(thus constraining the value within a range) and uses it as an index to an array of "buckets".
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What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...f Home with ID=1, Address="22 Valley St" and then populate the Inhabitants array with People instances for Dave, John, and Mike with just one query.
A N+1 query for the same address used above would result in:
Id Address
1 22 Valley St
with a separate query like
SELECT * FROM Person WHERE Hous...