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Why does C++ not allow inherited friendship?
...e to change Foo as doing so would introduce breaking changes into the code base (as I could not modify all class derived from Bar).
Thus if friendship was inherited you are inadvertently introducing a restriction on the ability to modify a class. This is undesirable as you basically render useless ...
Ubuntu running `pip install` gives error 'The following required packages can not be built: * freety
... system-level dependencies. This means pip will not install RPM(s) (Redhat based systems) or DEB(s) (Debian based systems).
To install system dependencies you will need to use one of the following methods depending on your system.
Ubuntu/Debian:
apt-get install libfreetype6-dev
To search for pa...
What are the use cases of Graph-based Databases (http://neo4j.org/)? [closed]
...
I used a graph database in a previous job. We weren't using neo4j, it was an in-house thing built on top of Berkeley DB, but it was similar. It was used in production (it still is).
The reason we used a graph database was that the data being s...
Dictionary returning a default value if the key does not exist [duplicate]
...ctionaries when I need default values.
I wish this were just part of the base Dictionary class.
public class DictionaryWithDefault<TKey, TValue> : Dictionary<TKey, TValue>
{
TValue _default;
public TValue DefaultValue {
get { return _default; }
set { _default = value; }
...
How to see what will be updated from repository before issuing “svn update” command?
...ated (without actually updating), run
command:
$ svn merge --dry-run -r BASE:HEAD .
if you want to know what content of a particular file has been changed in svn
server repository compared with your working copy, run command:
$ svn diff -r BASE:HEAD ./pathToYour/file
if you want to know wh...
How to add -Xlint:unchecked to my Android Gradle based project?
...d developers. Which is a problem for a thread entitled "... Android gradle based project".
– Robin Davies
May 23 '18 at 22:40
|
show 1 more ...
When should I use C++ private inheritance?
...ples off the top of my head:
When I want to expose some but not all of a base class's interface. Public inheritance would be a lie, as Liskov substitutability is broken, whereas composition would mean writing a bunch of forwarding functions.
When I want to derive from a concrete class without a v...
Kill a postgresql session/connection
...d <> pg_backend_pid()
-- don't kill the connections to other databases
AND datname = 'database_name'
;
Before executing this query, you have to REVOKE the CONNECT privileges to avoid new connections:
REVOKE CONNECT ON DATABASE dbname FROM PUBLIC, username;
If you're using P...
How do you parse and process HTML/XML in PHP?
... and modifying real world (broken) HTML and it can do XPath queries. It is based on libxml.
It takes some time to get productive with DOM, but that time is well worth it IMO. Since DOM is a language-agnostic interface, you'll find implementations in many languages, so if you need to change your pro...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...2、12 和 2.12），以及带前缀的其他机制数字，包括：
Base-2（二进制）数字，例如 0b10（等于十进制 2）
Base-8（八进制）数字，例如 0o14（等于十进制 12）
Base-16（十六进制）数字，例如 0xd4（等于十进制 212）
进制数字块 ( ...