casting Questions
31
Solved
PHP has an intval() function that will convert a string to an integer. However I want to check that the string is an integer beforehand, so that I can give a helpful error message to the user if it...
4
Solved
I've stored a pointer to a type_info object.
int MyVariable = 123;
const std::type_info* Datatype = &typeid(MyVariable);
How might I use this to typecast another variable to that type? I tri...
7
Solved
Studying for my OCA Java SE 7 Programmer I exam, so newbie question. I have an example question I do not understand. The following code compiles, but gives a ClassCastException at runtime:
interfa...
Bronwyn asked 10/11, 2013 at 21:17
4
Solved
Is there any benefit of casting NULL to a struct pointer in C ?
For example:
typedef struct List
{
....
} List;
List *listPtr = ((List *) NULL) ;
Example from PostgreSQL source:
#define NIL ...
8
Solved
This code:
SELECT JSON_EXTRACT('{"hello": null}', '$.hello')
Returns null.
However, this is not the MySQL native NULL. For example, this:
SELECT COALESCE(JSON_EXTRACT('{"hello": null}', '$.hel...
5
Solved
I am unable to understand the following:
In java,
long l = 130L;
byte b = (byte)l;
If I print the value of b, why do I get -126? What is the bit representation of long l?
4
Solved
i have some low level image/texture operations where 32-bit colors are stored as UInt32 or int and i need a really fast bitwise conversion between the two.
e.g.
int color = -2451337;
//except...
12
Solved
What are the proper uses of:
static_cast
dynamic_cast
const_cast
reinterpret_cast
(type)value (C-style cast)
type(value) (function-style cast)
How does one decide which to use in which specific c...
5
Solved
Recently, I was trying to store and read information from files in Python, and came across a slight problem: I wanted to read type information from text files. Type casting from string to int or to...
3
Solved
I need to convert string to variable value. I found solution only for C#. I need it in Java.
public class Property<T> {
T value;
public void setValue(String input){
if(value instanceof ...
3
Solved
uint32_t a = 10;
uint16_t b = 0;
if (a > b)
{
printf("a > b\n");
}
I was expecting that b would get promoted to int and the compiler would complain about comparing signed and uns...
Pumping asked 13/3, 2023 at 16:6
9
Solved
How do I avoid implicit casting on non-constructing functions?
I have a function that takes an integer as a parameter,
but that function will also take characters, bools, and longs.
I believe it do...
Limes asked 13/10, 2012 at 22:19
2
Solved
I’ve seen low-level bitwise expressions that use ~0 to generate a bit-pattern of all 1s, which is then used as masks, etc. For example on K&R page 45:
/* getbits: get n bits from position p */
...
Insincere asked 10/3, 2023 at 5:23
9
I want to convert string to integer in golang. But I don't know the format of string. For example, "10" -> 10, "65.0" -> 65, "xx" -> 0, "11xx" -> 11, "xx11"->0
I do some searching and find strconv...
Judie asked 18/7, 2015 at 4:8
5
Solved
I'm trying to convert a Vec of u32s to a Vec of u8s, preferably in-place and without too much overhead.
My current solution relies on unsafe code to re-construct the Vec. Is there a better way to ...
5
Solved
It seems there is no way of such one-line conversion using std.
I do not like this kind of verbosity:
match my_bool {
true => Ok(()),
false => Err(MyError::False),
}
I would like to use a ...
Opsis asked 23/2, 2019 at 12:0
11
Solved
How can I cast a value from Enum1 to Enum 2 in Java?
Here is an example of what I'm trying to do :
public enum Enum1 {
ONE,
TWO,
THREE;
}
public enum Enum2 {
FOUR,
FIVE,
SIX;
}
So I want ...
Exodus asked 2/9, 2011 at 13:54
22
Solved
How can I cast an Object to an int in java?
8
Solved
I have in model:
protected $casts = [
'date' => 'date',
];
Does laravel have some ability to set cast format, something like:
protected $casts = [
'date' => 'date_format:d/m/yyyy',
];
...
7
Solved
I am new to Scala and I am finding the need to convert a Boolean value to an Integer. I know I can use something like if (x) 1 else 0 but I would like to know if there is a preferred method, or som...
4
I have two types, T and U, and I want to know whether an implicit cast operator is defined from T to U.
I'm aware of the existence of IsAssignableFrom, and this is not what I'm looking for, as it ...
Boozy asked 15/8, 2015 at 13:28
13
Solved
What is the best way to convert a double to an int? Should a cast be used?
Disturbance asked 15/11, 2010 at 6:27
6
Solved
FYI: Swift bug raised here: https://bugs.swift.org/browse/SR-3871
I'm having an odd problem where a cast isn't working, but the console shows it as the correct type.
I have a public protocol
p...
3
Solved
before judging that this question is already answered, please read the description. I have this simple code below:
Dictionary<string, object> d = new Dictionary<string, object>();
d.Ad...
Crosscrosslet asked 19/7, 2019 at 7:41
1
Solved
I have an enum in my model class:
MyRepresentation { list, tabs, single }
I have already added an adapter and registered it.
I have given it a proper type id and fields.
It gives error:
HiveError...
Bachelor asked 9/1, 2023 at 13:48
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