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STL or Qt containers?
...s
are streamable with QDataStream
are used extensively in Qt's API
have a stable implementation across operating systems. A STL implementation must obey the C++ standard, but
is otherwise free to do as it pleases (see the std::string COW controversy). Some STL implementations are especially
bad.
pro...
What is the difference between a port and a socket?
..., W. Richard Stevens)
In most C-derived languages, TCP connections are established and manipulated using methods on an instance of a Socket class. Although it is common to operate on a higher level of abstraction, typically an instance of a NetworkStream class, this generally exposes a reference t...
Strings are objects in Java, so why don't we use 'new' to create them?
... yes, this optimization is possible because strings are immutable and therefore can be shared without problems. the shared "asdf" handling is an implementation of the 'Flyweight' design pattern.
– manuel aldana
Jan 6 '10 at 2:51
...
Using ECMAScript 6
...le using classes
ES6 is a fast moving target. Refer to the Compatibility Table to find features supported by transpilers such as Traceur and Babel and browser support. You can even expand the chart to see the test used to verify compatibility:
To try out bleeding edge ES6 in a browser try the ...
Should you choose the MONEY or DECIMAL(x,y) datatypes in SQL Server?
...) - square(avg(t2.monret))))),
current_timestamp,@MaxDate
from Table1 t1 join Table1 t2 on t1.Date = traDate
group by t1.index_id,t2.index_id
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Invoke-WebRequest, POST with parameters
...
Put your parameters in a hash table and pass them like this:
$postParams = @{username='me';moredata='qwerty'}
Invoke-WebRequest -Uri http://example.com/foobar -Method POST -Body $postParams
...
Why do you have to link the math library in C?
... in libc.so (or libc.a for static linking), which is linked into your executable by default (as if -lc were specified). GCC can be instructed to avoid this automatic link with the -nostdlib or -nodefaultlibs options.
The math functions in math.h have implementations in libm.so (or libm.a for stati...
How much of a git sha is *generally* considered necessary to uniquely identify a change in a given c
... Exactly the question I was trying to solve, thank you! The probability table linked in @Messa's answer is also helpful.
– Kyle Chadha
Jun 16 '17 at 15:36
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Using CSS :before and :after pseudo-elements with inline CSS?
...r(data-content); display: inline-block; width: 100%; }
</style>
<table><tr><td data-content="post"></td></tr></table>
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Storing a Map using JPA
...on
@MapKeyColumn(name="name")
@Column(name="value")
@CollectionTable(name="example_attributes", joinColumns=@JoinColumn(name="example_id"))
Map<String, String> attributes = new HashMap<String, String>(); // maps from attribute name to value
}
See also (in the JPA 2.0 s...