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What is an undefined reference/unresolved external symbol error and how do I fix it?
... the syntax rules of translation is specified by the following phases [see footnote].
Physical source file characters are mapped, in an implementation-defined manner, to the basic source character set
(introducing new-line characters for end-of-line indicators) if
necessary. [SNIP]
Each instance of...
Any reason why scala does not explicitly support dependent types?
...ector path through an object- (ie. value-) graph like so,
scala> class Foo { class Bar }
defined class Foo
scala> val foo1 = new Foo
foo1: Foo = Foo@24bc0658
scala> val foo2 = new Foo
foo2: Foo = Foo@6f7f757
scala> implicitly[foo1.Bar =:= foo1.Bar] // OK: equal types
res0: =:=[foo1.B...
Best Practice: Access form elements by HTML id or name attribute?
...input a name only:
<form id="myform">
<input type="text" name="foo">
Then the most standards-compliant and least problematic way to access your input element is via:
document.getElementById("myform").elements["foo"]
using .elements["foo"] instead of just .foo is preferable becaus...
Is it better to use C void arguments “void foo(void)” or not “void foo()”? [duplicate]
What is better: void foo() or void foo(void) ?
With void it looks ugly and inconsistent, but I've been told that it is good. Is this true?
...
Getting the name of a variable as a string
...wang/python-varname
In your case, you can do:
from varname import Wrapper
foo = Wrapper(dict())
# foo.name == 'foo'
# foo.value == {}
foo.value['bar'] = 2
For list comprehension part, you can do:
n_jobs = Wrapper(<original_value>)
users = Wrapper(<original_value>)
queues = Wrapper(&...
Easiest way to check for an index or a key in an array?
...ariable varname is set (has been assigned a value).
example:
declare -A foo
foo[bar]="this is bar"
foo[baz]=""
if [[ -v "foo[bar]" ]] ; then
echo "foo[bar] is set"
fi
if [[ -v "foo[baz]" ]] ; then
echo "foo[baz] is set"
fi
if [[ -v "foo[quux]" ]] ; then
echo "foo[quux] is set"
fi
This wil...
Make an existing Git branch track a remote branch?
...
Given a branch foo and a remote upstream:
As of Git 1.8.0:
git branch -u upstream/foo
Or, if local branch foo is not the current branch:
git branch -u upstream/foo foo
Or, if you like to type longer commands, these are equivalent to the a...
Can I mix Swift with C++? Like the Objective-C .mm files
...Header.h.
The following example returns a pointer to a C++ object (struct Foo) so Swift can store in a COpaquePointer instead of having struct Foo defined in the global space.
Foo.h file (seen by Swift - included in the bridging file)
#ifndef FOO_H
#define FOO_H
// Strictly C code here.
// 'str...
RRSet of type CNAME with DNS name foo.com. is not permitted at apex in zone bar.com
I own foo.com and bar.com . I am managing both in Route53. foo.com hosts my site, and I'd like to direct traffic from bar.com to foo.com . I tried to set up a CNAME record for bar.com pointing to foo.com , but I got the error message:
...
How do I escape the wildcard/asterisk character in bash?
...
Quoting when setting $FOO is not enough. You need to quote the variable reference as well:
me$ FOO="BAR * BAR"
me$ echo "$FOO"
BAR * BAR
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