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Why is argc not a constant?
...ntain pointers to strings, which are given
implementation-defined values by the host environment prior to program startup. The
intent is to supply to the program information determined prior to program startup
from elsewhere in the hosted environment. If the host environment is not capable of
...
Pinging servers in Python
... in any OS (Unix, Linux, macOS, and Windows)
Python 2 and Python 3
EDITS:
By @radato os.system was replaced by subprocess.call. This avoids shell injection vulnerability in cases where your hostname string might not be validated.
import platform # For getting the operating system name
import su...
What is the GAC in .NET?
...> GAC_MSIL
...snip...
0 File(s) 0 bytes
9 Dir(s) 90,538,311,680 bytes free
C:\Windows\assembly>cd GAC_64
C:\Windows\assembly\GAC_64>dir
Directory of C:\Windows\assembly\GAC_64
06/17/2009 04:22 PM <DIR> .
06/17/200...
What is compiler, linker, loader?
...ror because the equation is not
balanced. This unit checks this internally by generating the parser tree as
follows:
=
/ \
d -
/ \
+ *
...
Setting JDK in Eclipse
...you Georgie! Websters defines default as, "a selection automatically used by a program in the absence of a choice made by the user". Yet Eclipse's "Workspace Default JRE" is not selected by default.
– JohnC
Dec 4 '17 at 21:03
...
“Unknown class in Interface Builder file” error at runtime
...class, it can't find the code associated with it, and prints the warning.
By default, Objective-C targets will have -all_load -ObjC flags set by default, which will keep all of the symbols. But I had started with a C++ target, and didn't have that. Nevertheless, I found a way around this, which k...
What is the meaning of “… …” token? i.e. double ellipsis operator on parameter pack
... meaning to _ArgTypes..., ..., i.e. a variadic template expansion followed by a C-style varargs list.
Here's a test supporting that theory… I think we have a new winner for worst pseudo-operator ever.
Edit: This does appear to be conformant. §8.3.5/3 describes one way to form the parameter list...
Change private static final field using Java reflection
... the public static final Boolean.FALSE to refer to the Boolean referred to by Boolean.TRUE
As a result, subsequently whenever a false is autoboxed to Boolean.FALSE, it refers to the same Boolean as the one refered to by Boolean.TRUE
Everything that was "false" now is "true"
Related questions
Using...
Connect Java to a MySQL database
...rly old way of doing things. The better way is to get a DataSource, either by looking one up that your app server container already configured for you:
Context context = new InitialContext();
DataSource dataSource = (DataSource) context.lookup("java:comp/env/jdbc/myDB");
or instantiating and conf...
Structs versus classes
... reason about.
Are objects on the heap and the stack processed equally by the garbage collector?
No, they are not the same because objects on the stack are the roots of the collection. The garbage collector does not need to ever ask "is this thing on the stack alive?" because the answer to tha...