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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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Summarizing multiple columns with dplyr? [duplicate]
...#> # A tibble: 3 x 6
#> expression min median `itr/sec` mem_alloc `gc/sec`
#> <bch:expr> <bch:tm> <bch:tm> <dbl> <bch:byt> <dbl>
#> 1 dplyr 2.81ms 2.85ms 328. NA 17.3
#> 2 purrrlyr 7.96ms 8.04ms ...
iOS UIImagePickerController result image orientation after upload
...lling the CG related API, as that caused leads to a large amount of memory allocation. It will only be released when we no longer retain the UIImage.
– Tony Fung Choi Fung
Mar 14 '17 at 7:01
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How do I avoid capturing self in blocks when implementing an API?
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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...
Static Vs. Dynamic Binding in Java
...object. e.g. [speak(), speak(String) Class object]
A pointer to the memory allocated on the heap for that object’s data e.g. values of instance variables.
So all object references indirectly hold a reference to a table which holds all the method references of that object. Java has borrowed this ...
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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What are major differences between C# and Java?
...llows the definition of "structs", which are similar to classes but may be allocated on the stack (unlike instances of classes in C# and Java).
• C# implements properties as part of the language syntax.
• C# allows switch statements to operate on strings.
• C# allows anonymous methods...
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 ...
Optimal number of threads per core
...er things out of your control. But that's the main idea. Some OSes let you allocate processors so only your application has access/usage of said processor!
From my own experience, if you have a lot of I/O, multiple threads is good. If you have very heavy memory intensive work (read source 1, read s...
Check if a string contains a string in C++
... which is expensive, particularly for longer strings that necessitate heap allocations. Further, say you call CheckSubstring("XYZab", "ab\0\0") - the while loop will end up comparing a to a, b to b, the implicit NUL at the end of the first string to the explicit NUL in the second, then it will read...