Comparers | The last comparison library you 'll ever need

by StephenCleary C# Version: v6.2.2 License: MIT

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kandi X-RAY | Comparers Summary

Comparers is a C# library typically used in Utilities applications. Comparers has no bugs, it has no vulnerabilities, it has a Permissive License and it has low support. You can download it from GitHub.

The last comparison library you'll ever need! Wide platform support; fluent syntax.

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Support

Comparers has a low active ecosystem.

It has 376 star(s) with 29 fork(s). There are 26 watchers for this library.

It had no major release in the last 6 months.

There are 3 open issues and 23 have been closed. On average issues are closed in 115 days. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of Comparers is v6.2.2

Quality

Comparers has no bugs reported.

Security

Comparers has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

License

Comparers is licensed under the MIT License. This license is Permissive.

Permissive licenses have the least restrictions, and you can use them in most projects.

Reuse

Comparers releases are not available. You will need to build from source code and install.

Installation instructions are not available. Examples and code snippets are available.

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Comparers Key Features

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Comparers Examples and Code Snippets

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Community Discussions

Trending Discussions on Comparers

writing a (very) generic equality comparer

How to compare Tuples with a custom Comparer for entries, but the default Comparer for the Tuple?

Why is my TArray> failing to sort using a custom comparer when some values are NaN?

Hide different std::map compare parameters in c++

Alternative to FiraCode for coding purposes

C# comparing two large lists of items by a specific property

C#: How to evaluate multipe Comparer classes for an object when checking equality?

Poor performance comparing collections of objects using reflections and Linq Except/Intersect

Makefile link shared (dynamic) libraries

Cannot see existing data in WPF DataGridComboBoxColumn bound to ObservableCollection

QUESTION

writing a (very) generic equality comparer

Asked 2020-Sep-22 at 11:59

I have a data stucture that is straightforward serializable (e.g. to XML, to JSON): There is a main class C1 and several other classes C2, C3, ..., Cn. All classes Ci have public properties which are either

primitive types or string
IEnumerable where T is either primitive type or string or any of the classes Cj (where j != i)
Cj (where j != i)

There are no circular references.

I want to define a generic equality comparer ValueEqualityComparer which compares any of the classes Ci value-wise, i.e. in the following canonical way:

if type T is primitive, use Equals (or ==)
if type T is IEnumerable, use Enumerable.SequenceEqual on the S objects with a ValueEqualityComparer as third argument
else, for each public property P use ValueEqualityComparer
.Equals and connect these results via &&.

I already learned that pattern matching like above is not possible directly, so I need reflection. But I am struggling with how to do that.

Here is what I have written so far:

...

ANSWER

Answered 2020-Sep-22 at 11:20

Ok, so it took a little playing around, but I think I got it, here goes nothing.

For primitives and strings

Firstly, if it's a primitive or string, you can simply call left.Equals(right) (I decided to call the parameters left and right instead of x and y, just because)

For IEnumerables

Then, if it's an enumerable, things get more involved. Firstly we need to make a generic Type for our new ValueEqualityComparer, after that we get it's constructor and construct a new one (this step could possibly be enhanced by caching (in a Dictionary) previous equality comparers by type, so if a lot of one type get compared after another, we wouldn't need to create a new comparer every time). We then need to get the SequenceEquals method, make it generic and call it with our left, right and elementComparer.

For every other type

For every other type we want to compare property by property, we first need to get all the properties for the given type. Then we need to iterate over every property, get value of the property from left and right, create our generic ValueEqualityComparer, get its Equal method, and finally call said Equal method with our leftProp and rightProp

All together now:

This results in this class:

Source https://stackoverflow.com/questions/64005264

QUESTION

How to compare Tuples with a custom Comparer for entries, but the default Comparer for the Tuple?

Asked 2020-Aug-25 at 18:38

I want to sort a List>, i.e. a list of tuples, where each tuple contains a certain amount of vertices.
Vertex is a custom class, List and Tuple are from System.

I already have several Comparers that provide a way to compare two vertices, e.g.:
class MyVertexComparer1 : Comparer and class MyVertexComparer2 : Comparer

Now I would like to use these existing Comparers to sort the list according to the default tuple comparision, i.e. comparing the first entry and only in case of a tie comparing the next entry.
The comparision of two tuples within this sorting should be determined by one of the custom VertexComparers.

I know I could write a class MyTupleComparer : Comparer> that uses the MyVertexComparer in its implementation, maybe with a generic parameter that specifies which VertexComparer to use. However, this feels wrong as I would simply repeat the default comparision for tuples.
Moreover, I do not see how this could be extended to tuples with more than two vertices without a dedicated comparer class for each number of vertices.

...

ANSWER

Answered 2020-Aug-25 at 15:41

Make Vertex an IComparable, and the default Sort on List will work as you describe; that is, a default comparer will be used for Tuple, since no custom comparer is provided, and the Vertex.CompareTo method will be used for the entries.

If you want to reuse your existing Comparers, you can delegate/share the functionality with the IComparable.CompareTo implementation; but you can't do what you want without either writing another Comparer for Tuple (it'd be for each kind of Tuple, since Tuple is a different type than Tuple), or implementing IComparable on Vertex type.

Source https://stackoverflow.com/questions/63582007

QUESTION

Why is my TArray> failing to sort using a custom comparer when some values are NaN?

Asked 2019-Oct-30 at 23:08

I have a generic array of TPair records that contain an integer index and a double value. I am sorting this array by the value of each TPair by constructing a TComparer> that just calls the default TComparer on each TPair's value. However, I get an Access Violation when I call the sort. The problem seems to be related to the fact that some of my values are NaN. I don't have control over the fact that some values will be NaN, so I need to work around that.

I tried to check for NaN's before calling the default TComparer for doubles and instead replacing NaN with Low(Integer), but that didn't help. At this point I've made a test application that reproduces the problem and I can see that the TArray.QuickSort function is performing thousands of comparisons for an array with 3 items... not sure what is going on.

Printing out the two pairs being compared in each call to either of the custom comparers gives this result:

...

ANSWER

Answered 2019-Oct-30 at 23:08

Where to do want the NaNs positioned after the sort is done - the front or the back of the array? When you detect a NaN, DON'T call the default TComparer at all, just return < 0 or > 0 depending on where you want the NaN positioned relative to the other value (if BOTH are NaN, return 0 instead). And when you DO call the default TComparer for two non-NaN values, you have Left.Value and Right.Value backwards in both Compare1 and Compare2.

Try something like this instead:

Source https://stackoverflow.com/questions/58633880

QUESTION

Hide different std::map compare parameters in c++

Asked 2019-Oct-26 at 21:40

I have a class that looks like this:

...

ANSWER

Answered 2019-Oct-26 at 21:40

Use std::function for the comparator.

Source https://stackoverflow.com/questions/58571700

QUESTION

Alternative to FiraCode for coding purposes

Asked 2019-Sep-02 at 00:48

I've looked for improving my coding experience and read blogs about ligatures like this one. While interesting as a concept, all the resources I've found are about FiraCode. The impression I've got is that it's de facto standard and virtually the only font available for ligaturing in coding context.

The problem is that I find it a bit unpleasant for the eyes. It's tightened up compared to my beloved Consolas. Probably, what's so appealing is the monospace style of it, which doesn't need to collide with the ligatures. I'd like to see an extension to Consolas (or similar) that substitutes all the characters for ligatures only on the arrows, comparers etc.

Is there such a thing or did I google it right, not finding jack?

...

ANSWER

Answered 2019-Sep-02 at 00:48

Download this file https://github.com/somq/consolas-ligaturized/raw/master/ConsolasLigaturized.ttf
Double Click on the file and press "Install"(Windows) or "Install Font"(Mac)
In your fonts folder it will appear as "Consolas Ligaturized Regular"
Change the font family in VSCode to "Consolas Ligaturized Regular" if you are using Windows, "Consolas Ligaturized" is sufficent if you are using Mac

Windows

Mac

Turn on Ligatures

Result

Source https://stackoverflow.com/questions/57744266

QUESTION

C# comparing two large lists of items by a specific property

Asked 2019-Mar-13 at 10:23

I have two large lists of items whos class look like this (both lists are of same type):

...

ANSWER

Answered 2019-Mar-13 at 10:01

From a big-O complexity point of view, just comparing the lists in a nested for loop would be in the class of O(n*m), being n the size of the list in the DB, and m the size of the list fetched from the API.

What you can do to improve your performance is to sort the two lists, that would cost O(n log(n) + m log(m)), and then you could find the new items in O(n + m). Therefore, the overall complexity of your algorithm would then be in the class of O(n log(n) + m log(m)).

Here's an idea of the time it would take, comparing the quadratic solution to the superlinear one.

Source https://stackoverflow.com/questions/55138128

QUESTION

C#: How to evaluate multipe Comparer classes for an object when checking equality?

Asked 2018-Sep-15 at 13:45

Motivation

I'm looking to implement IComparer<> in a similar way to the demo code below. Where Foo is the type of objects I need to compare. It does not implement IComparable, but I'm providing an IComparer class for each field so the user can elect to equate to instances based on one field value.

...

ANSWER

Answered 2018-Sep-15 at 04:09

You can achieve by something like this :

Source https://stackoverflow.com/questions/52341265

QUESTION

Poor performance comparing collections of objects using reflections and Linq Except/Intersect

Asked 2018-Feb-05 at 00:38

I have written an app which compares two collections of objects (of the same type) and works out the similarities and the differences by comparing the objects using values of their properties (or combinations of their properties). This app was never intended to scale above 10000 objects in either of the collections and it was accepted that this a long running operation. The business requirement has now changed and we need to be able to compare up to 50000 (with a stretch target of up to 100000) of objects in either of the collections.

Below is minimal example of a type to be compared.

...

ANSWER

Answered 2018-Feb-04 at 20:14

Maybe you can pass a delegate to the comparer?

Source https://stackoverflow.com/questions/48612365

QUESTION

Makefile link shared (dynamic) libraries

Asked 2017-Aug-11 at 11:11

I have a problem with linking shared (dynamic) libraries .so or .dylib from my one project with another project.

I am using such Makefile:

...

ANSWER

Answered 2017-Aug-11 at 11:11

You have a typo, your $(COMPARERS_LIB_DIR) contains:

Source https://stackoverflow.com/questions/45633512

QUESTION

Cannot see existing data in WPF DataGridComboBoxColumn bound to ObservableCollection

Asked 2017-Jan-25 at 16:01

I'm working on a WPF application with a DataGrid which has manually defined columns. In that DataGrid the user shall be able to input data including a lower bound (a decimal value) and a comparer sign ("<" or "<=").

The DataGrid itself is bound to an ObservableCollection named StepDataSource:

...

ANSWER

Answered 2017-Jan-25 at 16:01

Try this:

Source https://stackoverflow.com/questions/41854153

Community Discussions, Code Snippets contain sources that include Stack Exchange Network

Vulnerabilities

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Install Comparers

You can download it from GitHub.

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