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Signed to unsigned conversion in C - is it always safe?
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As was previously answered, you can cast back and forth between signed and unsigned without a problem. The border case for signed integers is -1 (0xFFFFFFFF). Try adding and subtracting from that and you'll find that you can cast back and have it be correct.
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Printing hexadecimal characters in C
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My solution using a cast to unsigned char is one instruction smaller in gcc4.6 for x86-64...
– lvella
Nov 9 '11 at 15:20
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How to Create Deterministic Guids
... get Warning Bitwise-or operator used on a sign-extended operand; consider casting to a smaller unsigned type first
– Sebastian
Nov 13 '12 at 9:43
1
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What is the correct SQL type to store a .Net Timespan with values > 24:00:00?
... I'd probably convert the ticks into a time object like this: SELECT CAST(DATEADD(MILLISECOND, @Ticks/CAST(10000 AS BIGINT), '1900-01-01') AS TIME). The '1900-01-01' date doesn't matter, of course, it's just the third variable required by the DATEADD(...) function. Remember there are 100 nanos...
In what cases do I use malloc and/or new?
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malloc is not typesafe in any meaningful way. In C++ you are required to cast the return from void*. This potentially introduces a lot of problems:
#include <stdlib.h>
struct foo {
double d[5];
};
int main() {
foo *f1 = malloc(1); // error, no cast
foo *f2 = static_cast<foo*>...
Convert char to int in C and C++
... code, you can write
char a = 'a';
int ia = (int)a;
/* note that the int cast is not necessary -- int ia = a would suffice */
to convert the character '0' -> 0, '1' -> 1, etc, you can write
char a = '4';
int ia = a - '0';
/* check here if ia is bounded by 0 and 9 */
Explanation:
a - '0'...
What's the strangest corner case you've seen in C# or .NET? [closed]
... All the methods are overridden, except GetType() which can't be; so it is cast (boxed) to object (and hence to null) to call object.GetType()... which calls on null ;-p
Update: the plot thickens... Ayende Rahien threw down a similar challenge on his blog, but with a where T : class, new():
priv...
What is the proper way to check for null values?
... @BlackBear but the value returned is most probably a string, so the cast is valid
– Firo
Mar 20 '12 at 14:29
Th...
Type erasure techniques
...ght type is returned
T*& operator[](size_t i) { return reinterpret_cast<T*&>(Vector<void*>::operator[](i)); }
};
As you can see, we have a strongly typed container but Vector<Animal*>, Vector<Dog*>, Vector<Cat*>, ..., will share the same (C++ and binary) c...
Is there a way to call a stored procedure with Dapper?
...ierarchy,parentId) AS
(
SELECT
e.EventCategoryID as Id, cast(e.Title as varchar(max)) as Name,
cast(cast(e.EventCategoryID as char(5)) as varchar(max)) IdHierarchy,ParentID
FROM
EventCategory e where e.Title like '%'+@keyword+'%'
-- WHERE
-- pa...