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make_unique and perfect forwarding
..._ptr<A> &&, std::unique_ptr<B> &&). Having two raw news that are unsequenced with respect to one another means that if one new expression fails with an exception, the other may leak resources. As for why there's no make_unique in the standard: It was just forgotten. (This...
Mean per group in a data.frame [duplicate]
...
@FabianHabersack You’d ?merge the result with the raw data, but you need to use different names for the aggregated object. It’s easier to do what you’re after with dplyr: d %>% group_by(Name) %>% mutate(mean1=mean(Rate1), mean2=mean(Rate2))
– ...
How to print to console in pytest?
... out in that particular test.
For example,
def test_good():
for i in range(1000):
print(i)
def test_bad():
print('this should fail!')
assert False
Results in the following output:
>>> py.test tmp.py
============================= test session starts ================...
What is the difference between JSF, Servlet and JSP?
... templating in JSF, so that you're forced to create custom components with raw Java code (which is a bit opaque and a lot of tedious work) when you want to replace a repeated group of components with a single component. Since JSF 2.0, JSP has been deprecated as view technology in favor of Facelets....
Format a date using the new date time API
...field mapping is only the first step. The second step is then parsing to a raw object of type TemporalAccessor. And finally parsing delegates to the target type (here: LocalDate) and let it decide if it accepts all the field values in parsed intermediate object.
...
Search an Oracle database for tables with specific column names?
... data_type || ' (' ||
decode(data_type,'LONG',null,'LONG RAW',null,
'BLOB',null,'CLOB',null,'NUMBER',
decode(data_precision,null,to_char(data_length),
data_precision||','||data_scale
...
Returning JSON from PHP to JavaScript?
...back ; callback({});
$Json = new json('callback', 'name');
// Just send a raw JSON ; {}
$Json = new json();
// Build data
$object = new stdClass();
$object->test = 'OK';
$arraytest = array('1','2','3');
$jsonOnly = '{"Hello" : "darling"}';
// Add some content
$Json->add('width', '565px');
$...
How do you design object oriented projects? [closed]
...nswers. Nothing about reputation, voting, or the community wiki, just the raw essence of what you're shooting for.
As you come up with potential classes, don't think of them only in terms of what noun they represent, but what responsibilities they have. I've found this to be the biggest aid in fig...
When do you use POST and when do you use GET?
... an If-Modified-Since, If-Unmodified-Since, If-Match, If-None-Match, or If-Range header field. A conditional GET method requests that the entity be transferred only under the circumstances described by the conditional header field(s). The conditional GET method is intended to reduce unnecessary netw...
How is set() implemented?
... they do take constant time to look up items: python -m timeit -s "s = set(range(10))" "5 in s" 10000000 loops, best of 3: 0.0642 usec per loop <--> python -m timeit -s "s = set(range(10000000))" "5 in s" 10000000 loops, best of 3: 0.0634 usec per loop ... and that's the largest set that doesn...