20,024 questions
0
votes
2
answers
70
views
Why doesn't Comparer support 64-bit (long) delegate return type for lambda operations in C#?
I'm trying to create a priority queue in C# that consists of 64-bit (long) integers in DESCENDING order. Unfortunately, it looks like .NET doesn't support this?
Here's the code that fails:
...
- 588
-1
votes
1
answer
48
views
Swift - mutate struct after downcast
This is the abstraction of my code:
protocol MyProtocol {
var value1: Int {get set}
var value2: Int {get set}
}
struct MyStruct: MyProtocol {
var value1: Int = 1
var value2: Int = 2
...
- 537
1
vote
1
answer
54
views
What is the difference between using (double) versus multiplying by 1.0 when type casting an integer to a double?
I was wondering what the difference is between converting an integer to a double using double versus multiplying the integer by 1.0
int a = 4
int b = 3
double c = 1.0 * a / b
double d = (double) a / ...
- 13
1
vote
1
answer
64
views
How to downcast a trait to struct in Rust
I have the following trait defined:
pub trait TItem {
// some functions
}
I have two structs TArray and TObject with:
impl TItem for TArray {
// some functions
}
impl TItem for TObject {
// ...
- 319
0
votes
1
answer
35
views
Exception mapping string column value in Entity Framework Core 8 to an enum
I have an entity model which has a property of an enum type, and the values from the database column are strings.
I get this exception when reading data from DbContext:
Requested value 'PointSync' ...
1
vote
1
answer
59
views
How to safely cast integer in zig
The @intCast() causes undefined behavior when the target type cannot hold the resulting value. Is there something like @safeIntCast() or a similar function which would return CastError!anytype?
- 25
0
votes
1
answer
105
views
How to assign values to a base struct that aren't reset when downcasted as shared pointers
In my program (attempt to make a programming language), I have tokens. The tokens are represented with structs. My issue is that I don't know how to "evolve" the base token into a more ...
- 3
0
votes
1
answer
40
views
Does PyTorch tensor type cast preserve information?
Consider the following simple operation,
>>> t
tensor([ 1.8750, -0.6875, -1.1250, -1.3750, 1.3750, -1.1250, 0.4688, -0.4062,
0.8750, -1.7500], dtype=torch.float)
>>> t....
- 105
0
votes
1
answer
45
views
How do I cast an Eigen VectorXd value into a double?
My problem should be simple, but I have not been able to get it to work. I need to generate a random number from Eigen, set its range, and assign it t0 a double. It fails with all combinations I've ...
- 1
1
vote
1
answer
140
views
What's the best way to get the derived class from a base type pointer?
I tried two different ways to get a pointer to the derived class from a base pointer. One is:
struct BaseClass {
protected:
int offset_of_derived;
public:
template <typename T>
T* ...
- 13.8k
0
votes
1
answer
76
views
Why does the conditional (ternary) operator (? :) in Java perform type casting? [duplicate]
I've been experimenting with the ternary operator (? :) in Java and noticed that it automatically performs type casting on its expressions. For example, this code returns 2.0 instead of 2:
System.out....
0
votes
1
answer
37
views
Type 'string' is not assignable to type 'never'.ts(2322) const headerKey: never
I would like to ask why this particular line:
rowData[headerKey] = value;
is giving me this error:
Type 'string' is not assignable to type 'never'.ts(2322)
const headerKey: never
Here is the code:
...
0
votes
2
answers
79
views
compiler complains that an unused variable is used when simply a cast to void is performed
We just found out that a certain compiler (Greenhills) sees the following construct as an error:
// local variable
mytype x;
...
((void) (x));
The compiler reports:
error #549-D: variable "x&...
- 590
0
votes
0
answers
41
views
Casting in C - confused [duplicate]
I have a tiny little code snipplet here:
#include <stdio.h>
#include <math.h>
void main(void)
{
int clouds=15;
double
Zenith_rad=1.1827,
Normal_direct=774.6839,
A=0, B=0, C=...
- 317
0
votes
1
answer
57
views
User-defined implicit cast to generic is not used
I have a class that encapsulates a generic class T, and it has an implicit operator to convert the encapsulating class to T.
However, that conversion is only ever used if I cast explicitly in the ...
- 1,234