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How to disallow temporaries
...too.
Any constructor you want to guard needs a default argument on which set(guard) is called.
struct Guard {
Guard()
:guardflagp()
{ }
~Guard() {
assert(guardflagp && "Forgot to call guard?");
*guardflagp = 0;
}
void *set(Guard const *&guardflag) {
if(guar...
C default arguments
...per function, and a macro
around the wrapper function. In my work I have a set of macros to automate all this; once
you understand the flow it'll be easy for you to do the same.
I've written this up elsewhere, so here's a detailed external link to supplement the summary here: http://modelingwithdat...
How to make Twitter Bootstrap tooltips have multiple lines?
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What is Scala's yield?
...nerators, where you may use yield too).
It is applied in combination with for and writes a new element into the resulting sequence.
Simple example (from scala-lang)
/** Turn command line arguments to uppercase */
object Main {
def main(args: Array[String]) {
val res = for (a <- args) yie...
JavaScript + Unicode regexes
....
Unicode's website provides a way to translate Unicode categories into a set of code points. Since it's Unicode's website, the information from it should be accurate.
Note that you will need to exclude the high-end characters, as JavaScript can only handle characters less than FFFF (hex). I sugge...
How does Google Instant work?
...ems to just be AJAX calls to the old search, but it's pretty hard to simplify Google that much. Anybody have speculations?
...
Reduce, fold or scan (Left/Right)?
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string.IsNullOrEmpty(string) vs. string.IsNullOrWhiteSpace(string)
Is use of string.IsNullOrEmpty(string) when checking a string considered as bad practice when there is string.IsNullOrWhiteSpace(string) in .NET 4.0 and above?
...
Is there a short contains function for lists?
...myItem not in list:
# do something
It's work fine for lists, tuples, sets and dicts (check keys).
Note that this is an O(n) operation in lists and tuples, but an O(1) operation in sets and dicts.
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...
Split (explode) pandas dataframe string entry to separate rows
...lit(','))
for _, row in a.iterrows()]).reset_index()
Out[55]:
index 0
0 a 1
1 b 1
2 c 1
3 d 2
4 e 2
5 f 2
Then you just have to rename the columns
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