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Why is unsigned integer overflow defined behavior but signed integer overflow isn't?
...and Y, there will exist some other value Z such that X+Z will, if properly cast, equal Y and Y-Z will, if properly cast, equal X). If unsigned values were merely storage-location types and not intermediate-expression types (e.g. if there were no unsigned equivalent of the largest integer type, and ...
What is the fastest/most efficient way to find the highest set bit (msb) in an integer in C?
...2_t *)&ff))>>20)-1023; // assumes x86 endianness
This version casts the value to a double, then reads off the exponent, which tells you where the bit was. The fancy shift and subtract is to extract the proper parts from the IEEE value.
It's slightly faster to use floats, but a float ca...
A fast method to round a double to a 32-bit int explained
...e problem of getting that result into an integer variable without the slow cast. (There's also nothing C++-specific about your code.)
– rici
Aug 15 at 19:12
...
When should I use cross apply over inner join?
...N
(
SELECT TOP 2 ID, PERIOD,QTY
FROM DETAILS D
ORDER BY CAST(PERIOD AS DATE)DESC
)D
ON M.ID=D.ID
SQL FIDDLE
The above query generates the following result.
x------x---------x--------------x-------x
| Id | Name | PERIOD | QTY |
x------x---------x--------------x--...
Passing a 2D array to a C++ function
... You should use %p for printing a pointer, and even then, you must cast it to void *, else printf() invokes undefined behavior. Furthermore, you should not use the addressof (&) operator when calling the functions, since the functions expect an argument of type double (*)[size_y], wherea...
Can I pass an array as arguments to a method with variable arguments in Java?
...rgument to method x(X...) doesn't exactly match the vararg parameter type. Cast to X[] to confirm the non-varargs invocation, or pass individual arguments of type X for a varargs invocation.
– Luke Hutchison
Apr 21 at 22:06
...
Generate random numbers using C++11 random library
...e Breymann (2015) still use a clone of
srand( time( 0 ) );
srand( static_cast<unsigned int>(time(nullptr))); or
srand( static_cast<unsigned int>(time(NULL))); or
just with <random> instead of <time> and <cstdlib> #includings - so be careful to learn just from one bo...
What's the best way to put a c-struct in an NSArray?
...tableArray *)arrayRef;
struct {int member;} myStruct = {.member = 42};
// Casting to "id" to avoid compiler warning
[array addObject:(id)&myStruct];
// Hurray!
struct {int member;} *mySameStruct = [array objectAtIndex:0];
The above example completely ignores the issues with respect to memory...
Create Generic method constraining T to an Enum
...ty else str
Enum.GetValues(typedefof<'T>)
|> Seq.cast<_>
|> Seq.tryFind(fun v -> String.Compare(v.ToString(), str.Trim(), true) = 0)
|> function Some x -> x | None -> defaultValue
This one is easier to maintain since it's a well-known l...
Calling Objective-C method from C++ member function?
...ompile everything as Objective-C++ do you get warnings about using C-style casts and/or other C++-specific warnings about valid C-style code?
– dreamlax
Jun 30 '09 at 3:47
...