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Why references have types even though they are not objects?


By : Walt Ziegler
Date : July 30 2020, 02:00 PM
may help you . The purpose of having typed references (i.e. pointers) is to enable type checking (which helps to catch bugs). If you were to declare a reference as a different type, you will get a type error (you can cast it, but that needs to be done explicitly).
code :


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Why references to Strings don't behave like other Objects references?


By : user2953512
Date : March 29 2020, 07:55 AM
this will help Object references in Java are passed by value. Assigning just changes the value, it does not alter the original object reference.
In your example arr[0] is changed, but try arr=null and you will see it has no effect after the method has returned.

How can I determine which objects hold references to other objects that are causing memory leaks in objective-c?


By : exfallsburg1
Date : March 29 2020, 07:55 AM
will help you The analyze tool was unable to detect the problem. Using the allocations tool to capture all the reference counts was a start, but there were so many classes I didn't recognize, or access directly, I was not able to track down the problem using this method. Instead, I made a list of the classes that I was directly responsible for, and investigated each of them line by line till I found the problems. The cause was that I used some third party libraries which didn't decrement the retain count of some of my objects as expected. I guess in this case, following better software engineering principles / design patterns, and having thorough code reviews may have caught the problem earlier.

Objective-C would serialize/restore objects with multiple references create duplicate objects?


By : Ieva
Date : March 29 2020, 07:55 AM
hop of those help? Just encode the objects, they are uniquified as they are being written out. From the docs:

Lifetimes and references to objects containing references


By : Sarai Gómez
Date : March 29 2020, 07:55 AM
it helps some times Yes, this error may be confusing but there is a legitimate reason for it.
code :
struct SubImage<'a> {
    image: &'a mut Image<'a>,
    offset: (i32, i32),
    size: (i32, i32),
}
fn render2<'b, 'a>(image: &'b mut Image<'a>)
fn main() {
    'a: {
        let mut pixel_data: Vec<u8> = Vec::new();
        'b: {
            let mut image: Image<'a> = Image::new(&'a mut pixel_data, (1280, 720));
            render2::<'b, 'a>(&'b mut image);
        }
    }
}
fn render2<'a>(image: &'a mut Image<'a>)
struct SubImage<'b, 'a:'b> {
    image: &'b mut Image<'a>,
    offset: (i32, i32),
    size: (i32, i32),
}

PyYAML - Serialize classes (types / class references) that are members of objects


By : Chirag Arora
Date : March 29 2020, 07:55 AM
hope this fix your issue When loading dumped YAML, you normally don't need to preserve the information about which class needs to be instantiated. That is what tag information, stored in the file with !XObj, is for.
If you hide a reference to an object of a certain class, by not dumping the attribute that refers to it, and then run into problems instantiating that object (because you don't know its class) when loading, you are doing something wrong. In that case you should hide the internals of the referenced object, not the attribute that references the object. You could e.g. dump the referenced object using !XObj null.
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