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What is polymorphism, what is it for, and how is it used?
... I would say this is the clearest example, though if you are a PHP programmer this link might be easier to review FIRST, and then still look at this one after: code.tutsplus.com/tutorials/…
– Oliver Williams
Jan 6 '17 at 19:50
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Stopping scripters from slamming your website
...robably not necessary.
for additional security, the code can be a one-time token generated specifically for the request/IP/agent, so that repeated requests generate different codes. Or you can pre-generate a bunch of random codes (a one-time pad) if on-demand generation is too taxing.
Run time-tri...
smart pointers (boost) explained
...neither transferable nor sharable. It's just usable if you locally need to allocate memory, but be sure it's freed again when it goes out of scope. But it can still be swapped with another scoped_ptr, if you wish to do so.
shared_ptr is a smart pointer that shares ownership (third kind above). It ...
How do I avoid capturing self in blocks when implementing an API?
... sample
self.delegate = aDelegate;
self.dataProcessor = [[MyDataProcessor alloc] init];
// Use this inside blocks
__block id myself = self;
self.dataProcessor.progress = ^(CGFloat percentComplete) {
[myself.delegate myAPI:myself isProcessingWithProgress:percentComplete];
};
self.dataProcesso...
Initializing a struct to 0
...so just declare it myStruct _m;
If the data is a local variable or a heap-allocated zone, clear it with memset like:
memset(&m, 0, sizeof(myStruct));
Current compilers (e.g. recent versions of gcc) optimize that quite well in practice. This works only if all zero values (include null pointer...
When should you use constexpr capability in C++11?
... @alecov Definitly not everything... I/O, syscall and dynamic memory allocation definitly cann't be marked as constexpr Besides, not everything should be constexpr.
– JiaHao Xu
Oct 8 '18 at 7:52
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What is the difference between tinyint, smallint, mediumint, bigint and int in MySQL?
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The difference is the amount of memory allocated to each integer, and how large a number they each can store.
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What's the meaning of interface{}?
...dicated to holding the value in the interface structure, so the assignment allocates a chunk of memory on the heap and records the pointer in the one-word slot.
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Using a custom typeface in Android
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This will work, but pre-ICS it will allocate memory for the fonts for each view you instantiate: code.google.com/p/android/issues/detail?id=9904 A way to fix this is to create a globally-accessible static hashmap of all instantiated fonts: code.google.com/p/and...
Difference between Select and ConvertAll in C#
... Difference between ConvertAll and Select is ConvertAll will allocate the size of the list before hand. For a large sequence this will make a performance difference. Thus, if performance is your aim, use ConvertAll. If performance is not a concern, use Select as it's more idiomatic in ...