Questions tagged [casting]

Casting is a process where an object type is explicitly converted into another type if the conversion is allowed.

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1k views

Version of lexical_cast that doesn't use exceptions

I love boost::lexical_cast but its usage of exceptions there is not prefered in most situations I use it. I have implemented a version and it seems to work but I ...
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1answer
48 views

Two index computations differing in execution time

Code I have the following piece of code ...
2
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2answers
665 views

Downcast all elements from a list using static_cast

So I have this code: ...
9
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5answers
5k views

Python odd number diamond

I worked up a quick diamond program that takes only odd numbers while returning an error with even numbers or 0. The code looks rather ugly to me, especially with the recurring ...
2
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1answer
62 views

Implement interface type in implementation of another interface without too much casting

I have a group of tests that must be run in similar (but different) fashion and they have setups, results, etc. which are also similar but different. Great, I thought, I'll use interfaces to define ...
5
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3answers
50k views

Cast an object to Decimal? or Int? etc but leave it as null if it is null

In a case like this: object A1 = null; Decimal? B = Convert.ToDecimal(A1); object A2 = null; int? C = Convert.ToInt32(A2); Note that in case where ...
3
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2answers
471 views

Removing asInstance[T] from scala code

I've written this scala code and I cannot work out how/if it is possible to remove the asInstance in the definition of class ...
6
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1answer
12k views

Cast a raw map to a generic map using a method, cleanly and safely in a fail early manner

Casting, instanceof, and @SuppressWarnings("unchecked") are noisy. It would be nice to stuff them down into a method where they won't need to be looked at. ...
5
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1answer
204 views

Changing the type of an object inside a method?

First off, this is not my code. I'm curious what everyone thinks about changing the type of an object inside of a method then modifying the properties of the cast type. I wanted to use composition to ...
16
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3answers
7k views

Avoiding code duplication and retaining const correctness

Sometimes I run across the problem of having two member function overloads that only differ in the constness of this (and the return type, but that is less ...
5
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2answers
115 views

Avoiding casts in abstract types

I asked this question on Stack Overflow and in the comments someone had this to say. In a proper design, you should almost never have to do a dynamic_cast, even if it's hidden inside some nice ...
3
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3answers
217 views

Limited typecasting with regex

I'm learning Python, and found a fun little video on YouTube called "Learn Python through public data hacking". In essence it uses the CTA unofficial API to do some parsing of XML data. In taking ...
5
votes
1answer
359 views

Different Constructors, Same Implementation

I have this class containing two constructors with different signatures but they do the same thing: ...
1
vote
1answer
1k views

Can casting to fragment be more efficient than using a variable?

I'm new to using fragments in Android. I'm working on an app using a sliding panel layout and I just came up with an idea for changing my fragments. I decided to create the following method: ...
6
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2answers
2k views

Converting a region code (short string up to 4 characters) to a 32-bit integer

There is a function that converts region code strings (1 to 4 characters and null terminator) to 32 bit integers codes to be used in maps as keys or values. Blindly casting char* to int* is bad as it ...
7
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1answer
540 views

Is this a conforming implementation of duration_cast?

Sadly VS2012's duration_cast is broken, and I actually need the functionality which is broken. So, I wrote my own: ...
4
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1answer
3k views

Collection of Actions

I am trying to create a class to queue up a series of commands. (Not really a queue as events happen based on time). Each command has a callback (Action) that get's called. However, each Action has a ...
2
votes
2answers
318 views

NSArray and NSNumber-int conversions

I have a textView which is displaying a string. I also have an array which keeps track of where every line begins, it stores the "start index" or NSRange.location for every line. However, when text ...
2
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2answers
133 views

2D model simulating water breaking a floodbank

For a homework assignment we have to write a class that simulates water breaking a floodbank (very simplistic 2D simulation). My implementation works fine but I found that there were many downcasts (...
3
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1answer
473 views

Returning a more specific class

I would appreciate some feedback on my design of a few classes to query the Trakt.tv API. ...
24
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2answers
53k views

TryCast<T> method

This isn't urgent, it is more along the lines of trivia or a challenge. The solution works fine as it is, but I suspect it could be better. What follows is a method I came up with a while back in a ...
10
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3answers
270 views

Cast inside the method or let the client code cast, which one is better? [closed]

I have two choices of implementing a method, the first one is a generic type where the client code does not have to cast ...
0
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2answers
6k views

(sort of) casting types in Ruby: changing class of an instance [closed]

I defined the class Rectangle: ...
4
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1answer
174 views

CRAIICall class

I thought it was a good idea to use this in my C++ projects: ...
4
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1answer
174 views

Demonstration of pthread calls

Please review for any unnecessary casting, memory leaks, wrong use of pthread call, or validation problems in the given code. ...
2
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1answer
130 views

Nice way to using cast on TextView [closed]

Question is short. Assuming that I don't need reference itself, would this cast ((TextView) findViewById(R.id.someTextView)).setText("lala"); be better (or at ...
3
votes
1answer
1k views

Loading an Object from File with Type-Safety and Thread-Safe access

I'm attempting to write a bit of code that allows for easy and safe access to objects in a file. It seems to work great but I was curious if there was an easier way to do this or if Java already has ...
3
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1answer
853 views

Computing value sums in a custom grid

I have written a helper method which computes the sum of values in some custom grid, given the column indexes. The method appears to work (for a decimal - as Anthony pointed out, I need to test this ...
0
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2answers
112 views

Over-Riding User Input

Here's a trivial example: if type(length) != int: length = 16 as opposed to: ...
3
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1answer
10k views

Casting const pointer to non-const pointer when using struct iovec

struct iovec is defined in <uio.h> by the following way: ...
4
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2answers
7k views

Is this a proper way to check a viewstate of type int?

In page load I'm saving a query string int value in a viewstate. Then I save it to my DB. Here is the code I use to retrieve viewstate value and validating it: ...
16
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2answers
3k views

C++ int_cast<> function for checked casts?

In order to detect run-time integer casting problems, I've created this function*: ...
4
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4answers
533 views

Coding Practice - Float* -> Vector3* cast

If you were given the following: ...
2
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2answers
185 views

A way to do this without a lot of variables and casting?

Currently I have this code: ...
9
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2answers
28k views

How can I avoid unchecked cast warning in my generic recursive Iterator?

It's somewhat odd that Java's collection framework has no iterator for recursive data structures. Since I needed something like this, I wrote my own. First off, I need recursive elements: ...
4
votes
4answers
461 views

Euclidian distance - optimization and casting

I'm trying to optimize a simple Euclidian distance function in C. It's for a DLL, and calculates distances from one point to many. I have: Version 1: ...
13
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2answers
12k views

C++ string_cast<> template function

In C++, to simplify string conversion between std::string and std::wstring, I created the following utility template functions: ...
4
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2answers
2k views

Multiple explicit cast operations

This sample code works fine, but it looks awful. How would you improve this? ...
10
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2answers
625 views

Loops for removing unnecessary lines

I have the following method: ...