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Objective-C declared @property attributes (nonatomic, copy, strong, weak)

... retaining the copy. Assign Assign is somewhat the opposite to copy. When calling the getter of an assign property, it returns a reference to the actual data. Typically you use this attribute when you have a property of primitive type (float, int, BOOL...) Retain retain is required when the attribut...
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How should I print types like off_t and size_t?

...6, some_uint16_t); They are listed in the manpage of inttypes.h. Personally, I would just cast the values to unsigned long or long like another answer recommends. If you use C99, then you can (and should, of course) cast to unsigned long long or long long and use the %llu or %lld formats respect...
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Why are Subjects not recommended in .NET Reactive Extensions?

... Ok, If we ignore my dogmatic ways and ignore "subjects are good/bad" all together. Let us look at the problem space. I bet you either have 1 of 2 styles of system you need to ingrate to. The system raises an event or a call back when a message arrives You need to poll the system to see if t...
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How to compile and run C/C++ in a Unix console/Mac terminal?

... This is the command that works on all Unix machines... I use it on Linux/Ubuntu, but it works in OS X as well. Type the following command in Terminal.app. $ g++ -o lab21 iterative.cpp -o is the letter O not zero lab21 will be your executable file iterat...
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putting current class as return type annotation [duplicate]

...e. Instead, they are preserved in __annotations__ in string form. This is called Postponed Evaluation of Annotations, introduced in PEP 563. Also note: Deprecation policy Starting with Python 3.7, a __future__ import is required to use the described functionality. No warnings are raised...
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static const vs #define

... Personally, I loathe the preprocessor, so I'd always go with const. The main advantage to a #define is that it requires no memory to store in your program, as it is really just replacing some text with a literal value. It also has...
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Android NDK C++ JNI (no implementation found for native…)

...g the function prototype name wrong, another is failing to load the .so at all. Are you sure that System.loadLibrary() is being called before the method is used? If you don't have a JNI_OnLoad function defined, you may want to create one and have it spit out a log message just to verify that the l...
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How does Bluebird's util.toFastProperties function make an object's properties “fast”?

... eval("o" + o); // ensure no dead code elimination } Sans one or two small optimizations - all the below is still valid. Let's first discuss what it does and why that's faster and then why it works. What it does The V8 engine uses two object representations: Dictionary mode - in which object ar...
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Why is pow(a, d, n) so much faster than a**d % n?

...was taking so long (> 20 seconds) for midsize numbers (~7 digits). I eventually found the following line of code to be the source of the problem: ...
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Can't access object property, even though it shows up in a console log

...g)) and you will see the keys, or the state of the object at the time you called console.log. You will (usually) find the keys are being added after your console.log call. share | improve this answ...