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How expensive is RTTI?
...ame refers to the original development architecture, though the ABI specification works on lots of architectures including i686/x86_64. Comments in GCC's internal source and STL code refer to Itanium as the "new" ABI in contrast to the "old" one they used before. Worse, the "new"/Itanium ABI refers ...
Why should text files end with a newline?
... Unix tools expect this convention and work with it. For instance, when concatenating files with cat, a file terminated by newline will have a different effect than one without:
$ more a.txt
foo
$ more b.txt
bar$ more c.txt
baz
$ cat {a,b,c}.txt
foo
barbaz
And, as the previous example also demonst...
When should I use the Visitor Design Pattern? [closed]
...rarchy of animals
class Animal { };
class Dog: public Animal { };
class Cat: public Animal { };
(Suppose it is a complex hierarchy with a well-established interface.)
Now we want to add a new operation to the hierarchy, namely we want each animal to make its sound. As far as the hierarchy is ...
How to assign a heredoc value to a variable in Bash?
...
You can avoid a useless use of cat and handle mismatched quotes better with this:
$ read -r -d '' VAR <<'EOF'
abc'asdf"
$(dont-execute-this)
foo"bar"''
EOF
If you don't quote the variable when you echo it, newlines are lost. Quoting it preserves t...
What is the rationale behind having companion objects in Scala?
...me = "dog"
}
class Dog extends Animal
{
def companion = Dog
}
object Cat extends AnimalCounter
{
val name = "cat"
}
class Cat extends Animal
{
def companion = Cat
}
Which produces this output:
scala> new Dog
1 dogs created so far
scala> new Cat
1 cats created so far
scala&g...
How to send data to local clipboard from a remote SSH session
...kind of solution, and I've found one that works for me. It's a minor modification to a suggestion from OSX Daily.
In my case, I use Terminal on my local OSX machine to connect to a linux server via SSH. Like the OP, I wanted to be able to transfer small bits of text from terminal to my local clipbo...
How to split a comma-separated string?
... Keep in mind this won't trim the values so strings.get(1) will be " cat" not "cat"
– Alb
Jun 28 '13 at 15:33
46
...
Writing Unicode text to a text file?
...m __future__ import print_function
import io
from unicodedata import name, category
from curses.ascii import controlnames
from collections import Counter
try: # use these if Python 2
unicode_chr, range = unichr, xrange
except NameError: # Python 3
unicode_chr = chr
exclude_categories = set...
Using braces with dynamic variable names in PHP
..., please take a look at this question.
– Marcio Mazzucato
Jul 6 '14 at 0:54
Jut a warning if you are using this to inc...
Why should the “PIMPL” idiom be used? [duplicate]
...
Because you want Purr() to be able to use private members of CatImpl. Cat::Purr() would not be allowed such an access without a friend declaration.
Because you then don't mix responsibilities: one class implements, one class forwards.
...