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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
What the title says: what does it mean to encapsulate a variable in {} , "" , or "{} "? I haven't been able to find any explanations online about this - I haven't been able to refer to them except for using the symbols, which doesn't yield anything.
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Defining custom attrs
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Currently the best documentation is the source. You can take a look at it here (attrs.xml).
You can define attributes in the top <resources> element or inside of a <declare-styleable> element. If I'm going to use an attr in more than one place I put it in the roo...
Is it possible to get CMake to build both a static and shared version of the same library?
...ere is a ".lib" file for both shared and static. But on Linux and Mac you can even give both libraries the same name (e.g. libMyLib.a and libMyLib.so):
set_target_properties(MyLibStatic PROPERTIES OUTPUT_NAME MyLib)
But I don't recommend giving both the static and dynamic versions of the library...
Should composer.lock be committed to version control?
I'm a little confused with composer.lock used in an application with a repository.
8 Answers
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Java heap terminology: young, old and permanent generations?
... permanent generations are in the Java heap terminology, and more specifically the interactions between the three generations.
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MySQL, update multiple tables with one query
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Take the case of two tables, Books and Orders. In case, we increase the number of books in a particular order with Order.ID = 1002 in Orders table then we also need to reduce that the total number of books available in our stock by th...
The difference between fork(), vfork(), exec() and clone()
...ion on this, but there really wasn't any solid comparison between the four calls.
5 Answers
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When should I use a table variable vs temporary table in sql server?
...t is to say, the performance of table variable is better than temp table because table variable uses less IO operations than temp table.
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How to send POST request in JSON using HTTPClient in Android?
...figure this out for a while, I have found plenty of examples online, but I cannot get any of them to work. I believe this is because of my lack of JSON/networking knowledge in general. I know there are plenty of examples out there but could someone point me to an actual tutorial? I'm looking for a...
What is the proper declaration of main?
...ared as a non-member function in the global namespace. This means that it cannot be a static or non-static member function of a class, nor can it be placed in a namespace (even the unnamed namespace).
The name main is not reserved in C++ except as a function in the global namespace. You are fre...