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Swift and mutating struct
... concept, but in Swift, you can do this with one struct. Half work.
For C/C++ programmers, this is also very familiar concept. This is exactly what const keyword do in C/C++.
Also, immutable value can be very nicely optimised. In theory, Swift compiler (or LLVM) can perform copy-elision on values ...
How do I parse JSON with Objective-C?
...ndle] pathForResource:@"index" ofType:@"json"];
//将文件内容读取到字符串中，注意编码NSUTF8StringEncoding 防止乱码，
NSString* jsonString = [[NSString alloc] initWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];
//将字符串写到缓冲区。
NSData* jsonData...
String concatenation: concat() vs “+” operator
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Most answers here are from 2008. It looks that things have changed over the time. My latest benchmarks made with JMH shows that on Java 8 + is around two times faster than concat.
My benchmark:
@Warmup(iterations = 5, time = 200, timeUnit = TimeUni...
How to debug heap corruption errors?
I am debugging a (native) multi-threaded C++ application under Visual Studio 2008. On seemingly random occasions, I get a "Windows has triggered a break point..." error with a note that this might be due to a corruption in the heap. These errors won't always crash the application right away, altho...
facebook: permanent Page Access Token?
...\"Expected end of string instead of \"?\".\" at character 11: access_toke\u200c\u200bn", "type": "OAuthException", "code": 2500, "fbtrace_id": "A8+gtSaShIO" } } Anyone knows how to resolve it????
– Lucy
Sep 27 '16 at 11:04
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What uses are there for “placement new”?
Has anyone here ever used C++'s "placement new"? If so, what for? It looks to me like it would only be useful on memory-mapped hardware.
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How do I make and use a Queue in Objective-C?
I want to use a queue data structure in my Objective-C program. In C++ I'd use the STL queue. What is the equivalent data structure in Objective-C? How do I push/pop items?
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When should static_cast, dynamic_cast, const_cast and reinterpret_cast be used?
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const_cast can be used to remove or add const to a variable; no other C++ cast is capable of removing it (not even reinterpret_cast). It is important to note that modifying a formerly const value is only undefined if the original variable is const; if you use it to take the const off a referenc...
Variable declared in for-loop is local variable?
...i by a different name.
N.B:
Please note, C#'s scoping rules differ from C++'s scoping rules. In C++ variables are only in scope from where they are declared until the end of the block. Which would make your code a valid construct in C++.
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Reading binary file and looping over each byte
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@usr: the performance difference can be as much as 200 times for the code I've tried.
– jfs
Nov 16 '13 at 4:56
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