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What's the scope of the “using” declaration in C++?
...Writing using std::string is never OK. Writing using ImplementationDetail::Foo in your own header, when that header declares ImplementationDetail::Foo can be OK, moreso if the using declaration happens in your namespace. E.g.
namespace MyNS {
namespace ImplementationDetail {
int Foo;
...
Why is “final” not allowed in Java 8 interface methods?
...ementors. For example, suppose you have:
interface A {
default void foo() { ... }
}
interface B {
}
class C implements A, B {
}
Here, everything is good; C inherits foo() from A. Now supposing B is changed to have a foo method, with a default:
interface B {
default void foo() { .....
How to build query string with Javascript
...nd return the query parameters, eg: "var1=value&var2=value2&arr[]=foo&arr[]=bar..."
20 Answers
...
Git Alias - Multiple Commands and Parameters
...
No it won't. Git will transform git chs foo into git checkout && git status foo
– Lily Ballard
Sep 23 '11 at 20:13
...
What does $@ mean in a shell script?
...rameters passed to the script.
For instance, if you call ./someScript.sh foo bar then $@ will be equal to foo bar.
If you do:
./someScript.sh foo bar
and then inside someScript.sh reference:
umbrella_corp_options "$@"
this will be passed to umbrella_corp_options with each individual paramet...
How to execute IN() SQL queries with Spring's JDBCTemplate effectivly?
...s = new MapSqlParameterSource();
parameters.addValue("ids", ids);
List<Foo> foo = getJdbcTemplate().query("SELECT * FROM foo WHERE a IN (:ids)",
parameters, getRowMapper());
This only works if getJdbcTemplate() returns an instance of type NamedParameterJdbcTemplate
...
How do I run two commands in one line in Windows CMD?
...is on all Microsoft OSes since 2000, and still good today:
dir & echo foo
If you want the second command to execute only if the first exited successfully:
dir && echo foo
The single ampersand (&) syntax to execute multiple commands on one line goes back to Windows XP, Windows 2...
How to access a dictionary element in a Django template?
...s the following lookups, in
this order:
Dictionary lookup (e.g., foo["bar"])
Attribute lookup (e.g., foo.bar)
Method call (e.g., foo.bar())
List-index lookup (e.g., foo[2])
The system uses the first lookup type
that works. It’s short-circuit logic.
...
'any' vs 'Object'
... of these functions, but it's a type error to call d with a primitive:
b("foo"); //Okay
c("foo"); //Okay
d("foo"); //Error: "foo" is a primitive
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How to insert a newline in front of a pattern?
...ch is awkward, but it works:
$ sed 's/regexp/\
&/'
Example:
$ echo foo | sed 's/.*/\
&/'
foo
See here for details. If you want something slightly less awkward you could try using perl -pe with match groups instead of sed:
$ echo foo | perl -pe 's/(.*)/\n$1/'
foo
$1 refers to the ...