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multiple definition of template specialization when using different objects
...p violating the one definition rule as David says. Note that when you partially specialize templates, the partial specializations do still depend on one or more template parameters, so they still go in a .h file.
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What is the difference between connection and read timeout for sockets?
...dshake. The read timeout is the timeout on waiting to read data1. Specifically, if the server fails to send a byte <timeout> seconds after the last byte, a read timeout error will be raised.
2) What does connection timeout set to "infinity" mean? In what situation can it remain in an infi...
When to use f:viewAction / preRenderView versus PostConstruct?
...ented to perform actions directly after bean's construction and setting of all injected dependencies and managed properties such as @EJB, @Inject, @ManagedProperty, etc. Namely, the injected dependencies are not available inside the bean's constructor. This will thus run only once per view, session ...
Get current batchfile directory
...
System read-only variable %CD% keeps the path of the caller of the batch, not the batch file location.
You can get the name of the batch script itself as typed by the user with %0 (e.g. scripts\mybatch.bat). Parameter extensions can be applied to this so %~dp0 will return the D...
SPA best practices for authentication and session management
...-considered-harmful/
To summarize:
A man-in-the-middle attack can trivially replace your crypto code with <script>
function hash_algorithm(password){ lol_nope_send_it_to_me_instead(password); }</script>
A man-in-the-middle attack is trivial against a page that serves any resource ove...
.war vs .ear file
...are packaged as a JAR file with .war (web archive) extension
EAR:
All the above files (.jar and .war) are packaged as a JAR file with .ear (enterprise archive) extension and deployed into Application Server.
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How to decide font color in white or black depending on background color?
... have the intensities for the individual colors, you can determine the overall intensity of the color and choose the corresponding text.
if (red*0.299 + green*0.587 + blue*0.114) > 186 use #000000 else use #ffffff
The threshold of 186 is based on theory, but can be adjusted to taste. Based on ...
Add unique constraint to combination of two columns
...ctive, PersonNumber)
VALUES(N'foo', 1, 22);
GO
Data in the table after all of this:
ID Name Active PersonNumber
---- ------ ------ ------------
1 foo 1 22
2 foo 0 22
Error message on the last insert:
Msg 2627, Level 14, State 1, Line 3
Violation of UNIQUE KEY c...
Why use non-member begin and end functions in C++11?
...r that container. However, C++11 has apparently introduced free functions called std::begin and std::end which call the begin and end member functions. So, instead of writing
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Does it make sense to do “try-finally” without “catch”?
...you want the currently executing method to still throw the exception while allowing resources to be cleaned up appropriately. Below is a concrete example of handling the exception from a calling method.
public void yourOtherMethod() {
try {
yourMethod();
} catch (YourException ex) {...