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#define macro for debug printing in C?
...ich deletes the comma preceding the notation if, but only if, the previous token is a comma:
#define debug_print(fmt, ...) \
do { if (DEBUG) fprintf(stderr, fmt, ##__VA_ARGS__); } while (0)
This solution retains the benefit of requiring the format argument while accepting optional arg...
Why doesn't the example compile, aka how does (co-, contra-, and in-) variance work?
... so counter-intuitive, though it does have one very important application: functions.
trait Function1[-P, +R] {
def apply(p: P): R
}
Notice the "-" variance annotation on the P type parameter. This declaration as a whole means that Function1 is contravariant in P and covariant in R. Thus, we ...
ReSharper warns: “Static field in generic type”
...
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What is the most efficient/elegant way to parse a flat table into a tree?
...g with this data to display a tree, I created a tree_item_iterator utility function which, for each node, should give you sufficient information to generate whatever kind of display you want.
More info about MPTT:
Trees in SQL
Storing Hierarchical Data in a Database
Managing Hierarchical Data in ...
Best approach for designing F# libraries for use from both F# and C#
...
Daniel already explained how to define a C#-friendly version of the F# function that you wrote, so I'll add some higher-level comments. First of all, you should read the F# Component Design Guidelines (referenced already by gradbot). This is a document that explains how to design F# and .NET lib...
Why / when would it be appropriate to override ToString?
...
Yes. Also this is very useful in MVC or ASP.Net development where @yourObject and <%=yourObject%> are going to be "ToString-ed".
– Ben Lesh
Apr 23 '12 at 14:23
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An example of how to use getopts in bash
...ptional arguments" with getopts. The parser simply cannot know if the next token is an argument to the current option or an option by itself since -p might be the intended value. You can hack around this if you absolutely know that an option parameter cannot look like another valid option, yes, but ...
How to generate a random number in C++?
... generating symmetric keys, asymmetric private keys, salt values, security tokens, etc.
However security-grade random numbers is a separate industry worth a separate article.
In most cases Pseudo-Random Number Generator is sufficient - e.g. for scientific simulations or games. In some cases consiste...
Design Patterns web based applications [closed]
...em onto the browser to be handled in the presentation layer. For .Net, the ASP.NET MVC pattern is very good in terms of keeping the layers separated. Look into the MVC pattern.
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Build an ASCII chart of the most commonly used words in a given text [closed]
...76-length$w);$b="_"x($f/$q*$x);$_="|$b| $w ";$.>1or$_=" $b\n$_"'
for fun, here's a perl-only version (much faster):
~ % wc -c pgolf
204 pgolf
~ % cat pgolf
perl -lne'$1=~/^(the|and|o[fr]|to|.|i[tns])$/i||$f{lc$1}++while/\b([a-z]+)/gi}{@w=(sort{$f{$b}<=>$f{$a}}keys%f)[0..21];$Q=$f{$_=$w[...