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Create unique constraint with null columns
I have a table with this layout:
4 Answers
4
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Android 4.3 Bluetooth Low Energy unstable
... use Bluetooth Low Energy (testing on the Nexus 4). After getting started with the official BLE APIs in Android 4.3, I have noticed that after I connect a device for the first time I am rarely able to successfully connect to / communicate with that device or any other device again.
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How do I convert between big-endian and little-endian values in C++?
How do I convert between big-endian and little-endian values in C++?
31 Answers
31
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Casting a variable using a Type variable
...object input) {
return (T) Convert.ChangeType(input, typeof(T));
}
Edit:
Some people in the comments say that this answer doesn't answer the question. But the line (T) Convert.ChangeType(input, typeof(T)) provides the solution. The Convert.ChangeType method tries to convert any Object to the ...
Undefined reference to vtable
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The GCC FAQ has an entry on it:
The solution is to ensure that all virtual methods that are not pure are defined. Note that a destructor must be defined even if it is declared pure-virtual [class.dtor]/7.
Therefore, you need to provide a definition fo...
When to use static classes in C# [duplicate]
... my thoughts of static classes in an earlier Stack Overflow answer:
Class with single method -- best approach?
I used to love utility classes filled up with static methods. They made a great consolidation of helper methods that would otherwise lie around causing redundancy and maintenance hell. The...
The tilde operator in C
I've seen the tilde operator used in the ELF hashing algorithm, and I'm curious what it does. (The code is from Eternally Confused .)
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Should an Enum start with a 0 or a 1?
...follow
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edited Feb 12 at 12:06
axmrnv
75088 silver badges2121 bronze badges
answered Aug...
How can I view the shared preferences file using Android Studio?
... then I will look up how to access the info through my program then output it to log cat. Hopefully, though, I can just view the file on the phone directly as it is much simpler. Thanks.
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How do I stop Entity Framework from trying to save/insert child objects?
When I save an entity with entity framework, I naturally assumed it would only try to save the specified entity. However, it is also trying to save that entity's child entities. This is causing all sorts of integrity problems. How do I force EF to only save the entity I want to save and therefore ig...