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What are copy elision and return value optimization?
... Thing {
public:
Thing();
~Thing();
Thing(const Thing&);
};
void foo(Thing t);
foo(Thing());
or when an exception is thrown and caught by value:
struct Thing{
Thing();
Thing(const Thing&);
};
void foo() {
Thing c;
throw c;
}
int main() {
try {
foo();
}
catch(Thi...
Turn off textarea resizing
...to a single textarea by name (where the textarea HTML is ):
textarea[name=foo] {
resize: none;
}
Or by id (where the textarea HTML is ):
#foo {
resize: none;
}
Taken from:
http://www.electrictoolbox.com/disable-textarea-resizing-safari-chrome/
...
Hibernate lazy-load application design
...osing session context in my own application caches. Typical case:
object foo is loaded and put into a map;
another thread takes this object from the map and calls foo.getBar() (something that was never called before and is lazy evaluated);
boom!
So, to address this we have a number of rules:
w...
SQLite - UPSERT *not* INSERT or REPLACE
...D=1:
INSERT OR REPLACE INTO Employee (id, name, role)
VALUES (1, 'John Foo', 'CEO');
BAD: This will insert or replace 2 of the columns... the NAME column will be set to NULL or the default value:
INSERT OR REPLACE INTO Employee (id, role)
VALUES (1, 'code monkey');
GOOD: Use SQLite O...
find -exec cmd {} + vs | xargs
... etc. This can be a security vulnerability as if there is a filename like "foo -o index.html" then -o will be treated as an option. Try in empty directory: "touch -- foo\ -o\ index.html; find . | xargs cat". You'll get: "cat: invalid option -- 'o'"
– Tometzky
M...
Why does Google prepend while(1); to their JSON responses?
...bject, when not enclosed by anything, is not valid in Javascript:
eval('{"foo":"bar"}')
// SyntaxError: Unexpected token :
This is however valid JSON:
JSON.parse('{"foo":"bar"}')
// Object {foo: "bar"}
So, make sure you always return an Object at the top level of the response makes sure that t...
How to exclude file only from root folder in Git
...ash at the ends limits the match to folders only. If you had a file named 'foo' in the root directory, /foo/ would not ignore it, but /foo would.
– tehDorf
Jun 20 '17 at 0:19
...
Private setters in Json.Net
...e a constructor that has a parameter matching your property:
public class Foo
{
public string Bar { get; }
public Foo(string bar)
{
Bar = bar;
}
}
Now this works:
string json = "{ \"bar\": \"Stack Overflow\" }";
var deserialized = JsonConvert.DeserializeObject<Foo>...
Skip the headers when editing a csv file using Python
...hich "skips" the header row and uses it to allowed named indexing.
Given "foo.csv" as follows:
FirstColumn,SecondColumn
asdf,1234
qwer,5678
Use DictReader like this:
import csv
with open('foo.csv') as f:
reader = csv.DictReader(f, delimiter=',')
for row in reader:
print(row['Fir...
Spring Boot Rest Controller how to return different HTTP status codes?
...reate(@RequestBody String data) {
int customHttpStatusValue = 499;
Foo foo = bar();
return ResponseEntity.status(customHttpStatusValue).body(foo);
}
The CustomHttpStatusValue could be any integer within or outside of standard HTTP Status Codes.
...