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How to get the original value of an attribute in Rails
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ActiveRecord's attributes_before_type_cast method returns a hash of attributes before typecasting and deserialization have occurred.
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Is there a better alternative than this to 'switch on type'?
...ching-on-types
Short version: TypeSwitch is designed to prevent redundant casting and give a syntax that is similar to a normal switch/case statement. For example, here is TypeSwitch in action on a standard Windows form event
TypeSwitch.Do(
sender,
TypeSwitch.Case<Button>(() => te...
How much is too much with C++11 auto keyword?
...bdas can't be spelled, so auto f = []... is good style. The alternative is casting to std::function but that comes with overhead.
I can't really conceive of an "abuse" of auto. The closest I can imagine is depriving yourself of an explicit conversion to some significant type -- but you wouldn't use...
Move an array element from one array position to another
...ve2 = function(pos1, pos2) {
// local variables
var i, tmp;
// cast input parameters to integers
pos1 = parseInt(pos1, 10);
pos2 = parseInt(pos2, 10);
// if positions are different and inside array
if (pos1 !== pos2 && 0 <= pos1 && pos1 <= this.lengt...
Null or default comparison of generic argument in C#
...ype
Console.WriteLine("test".IsDefault());
// null must be cast to a type
Console.WriteLine(((String)null).IsDefault());
}
}
// The type cannot be generic
public static class TypeHelper
{
// I made the method generic instead
public static bool IsDefault<T>(...
How can I use NSError in my iPhone App?
...this is a pretty awesome answer, although there are some issues in ARC and casting the id to a BOOL. Any slight ARC compatible variation would be much appreciated.
– NSTJ
Dec 5 '12 at 17:28
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How to reverse a singly linked list using only two pointers?
... this the same way you can swap two numbers without using a third. Simply cast the pointers to a int/long and perform the XOR operation a couple of times. This is one of those C tricks that makes for a fun question, but doesn't have any practical value.
Can you reduce the O(n) complexity? No, ...
What is the purpose of std::make_pair vs the constructor of std::pair?
...from making the mistake of passing types o1 or o2 that can't implicitly be cast to T1 or T2. For instance passing a negative number to an unsigned int. -Wsign-conversion -Werror will not catch this error with std::pair constructor in c++11 however it will catch the error if std::make_pair is used.
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Using a Single Row configuration table in SQL Server database. Bad idea?
...ing with the settings in code, you have to know what type a setting is and cast it
The single row option is by far the easiest one to work with. This is because you can store each setting in its correct type in the database and not have to store the types of the settings as well as their lookup key...
Platform independent size_t Format specifiers in c?
... C89/C90. If you're aiming for C89-compliant code, the best you can do is cast to unsigned long and use the l length modifier instead, e.g. printf("the size is %lu\n", (unsigned long)size);; supporting both C89 and systems with size_t larger than long is trickier and would require using a number of...