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Coding Practices which enable the compiler/optimizer to make a faster program
...ovide an example of loop unrolling
Before:
unsigned int sum = 0;
for (size_t i; i < BYTES_TO_CHECKSUM; ++i)
{
sum += *buffer++;
}
After unrolling:
unsigned int sum = 0;
size_t i = 0;
**const size_t STATEMENTS_PER_LOOP = 8;**
for (i = 0; i < BYTES_TO_CHECKSUM; **i = i / STATEMENTS_PER_L...
How to download image using requests
...flate). You can force it to decompress for you anyway by setting the decode_content attribute to True (requests sets it to False to control decoding itself). You can then use shutil.copyfileobj() to have Python stream the data to a file object:
import requests
import shutil
r = requests.get(settin...
What is the best way to concatenate two vectors?
...
Based on Kiril V. Lyadvinsky answer, I made a new version. This snippet use template and overloading. With it, you can write vector3 = vector1 + vector2 and vector4 += vector3. Hope it can help.
template <typename T>
...
Mapping over values in a python dictionary
...ch function; the easiest way to do this is to use a dict comprehension:
my_dictionary = {k: f(v) for k, v in my_dictionary.items()}
In python 2.7, use the .iteritems() method instead of .items() to save memory. The dict comprehension syntax wasn't introduced until python 2.7.
Note that there is ...
How to do what head, tail, more, less, sed do in Powershell? [closed]
...txt | more # or less if you have it installed
gc log.txt | %{ $_ -replace '\d+', '($0)' } # sed
This works well enough for small files, larger ones (more than a few MiB) are probably a bit slow.
The PowerShell Community Extensions include some cmdlets for specialised file stuf...
How to query SOLR for empty fields?
...ou need to change QueryParameter.cs (Create a new parameter)
private bool _negativeQuery = false;
public QueryParameter(string field, string value, ParameterJoin parameterJoin = ParameterJoin.AND, bool negativeQuery = false)
{
this._field = field;
this._value = value.Trim();
this._para...
Convert hyphens to camel case (camelCase)
...and have it included in your project.
var str = 'my-hyphen-string';
str = _.camelCase(str);
// results in 'myHyphenString'
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Explain the concept of a stack frame in a nutshell
...k with it's stack frame. It means that whenever any recursive function get base condition satisfied and we put a return after base condition, the base condition will not wait to load local variables which are located in the “else” part of program. It will immediately return the current frame fro...
How much does it cost to develop an iPhone application? [closed]
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@Philippe I'm also one of the owners of the business that built the product. Who would have a better view on accurate project costs? And th...
When should I make explicit use of the `this` pointer?
...T> {
using A<T>::i; // explicitly refer to a variable in the base class
int foo() {
return i; // i is now known to exist
}
};
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