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Proper usage of Optional.ifPresent()
...r> user = ...
user.ifPresent(this::doSomethingWithUser);
This is basically the same thing as
Optional<User> user = ...
user.ifPresent(new Consumer<User>() {
@Override
public void accept(User theUser) {
doSomethingWithUser(theUser);
}
});
The idea is that the d...
CMake: Project structure with unit tests
...sqr.h), and then you can avoid listing (and more importantly re-compiling) all the sources twice.
For question 3, these commands add a test called "MyTest" which invokes your executable "test" without any arguments. However, since you've added these commands to test/CMakeLists.txt and not your top...
Determine if Android app is being used for the first time
...
Beware for Android 6.0 (API 23 - Marshmallow) or above auto backup (developer.android.com/guide/topics/data/autobackup.html)is enabled by default. If the users uninstalls and then reinstalls the app the shared preferences will be recovered. So on reinstalls you ca...
Does MySQL foreign_key_checks affect the entire database?
... This means it can be set for session:
SET FOREIGN_KEY_CHECKS=0;
or globally:
SET GLOBAL FOREIGN_KEY_CHECKS=0;
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right click context menu for datagridview
...text Menu key).
Cell selection on right mouse click has to be handled manually. Showing the context menu does not need to be handled as this is handled by the UI.
This completely mimics the approach used by Microsoft Excel. If a cell is part of a selected range, the cell selection doesn't change a...
how to convert a string to date in mysql?
...ourdatefield, '%m/%d/%Y') > CURDATE() - INTERVAL 7 DAY
You can handle all kinds of date/time layouts this way. Please refer to the format specifiers for the DATE_FORMAT() function to see what you can put into the second parameter of STR_TO_DATE().
...
Calling a class function inside of __init__
...
Call the function in this way:
self.parse_file()
You also need to define your parse_file() function like this:
def parse_file(self):
The parse_file method has to be bound to an object upon calling it (because it's not a ...
Do SVG docs support custom data- attributes?
...
While other answers are technically correct, they omit the fact that SVG provides an alternative mechanism for data-*. SVG allows any attribute and tag to be included, as long as it doesn't conflict with existing ones (in other words: you should use namesp...
OpenShift rhc setup using multiple accounts
...using "server add" command and then you can provide the server nickname in all subsequent commands using --server option.
For example,
rhc server add -l <first_account> --nickname srv1 <first-server>
rhc server add -l <second_account> --nickname srv2 <second-server>
You m...
What's the difference between integer class and numeric class in R
...for double precision floating point numbers) and integer. R will automatically convert between the numeric classes when needed, so for the most part it does not matter to the casual user whether the number 3 is currently stored as an integer or as a double. Most math is done using double precision...