I come from a python world where only hashable objects may be used as keys to a dictionary. Is there a similar restriction in C#? Can you use custom types as dictionary keys?

Under PostgreSQL, I'm using PersistentDuration for the mapping between the sql type interval & duration but it doesn't work. Another user found the same issue & come with his own class: p...

I want to create a custom type in Dart like I would do in typescript. This type should be a subtype of String, accepting only some values. For example, in Typescript I would do: type myType = 'HELL...

I need to use custom type, e.g., LunarDate, in my Mojo object: class MyMojo extends AbstractMojo { /** @parameter */ LunarDate lunarDate; } And I want to configure the parameter in <confi...

In Elm, there's no native way to encode/decode a custom type. This makes send and receive custom-typed values to JS difficult. I was confused for a while and wonder how to handle simple custom type...

In phpDoc-generated documentation I can cause phpDoc to generate a link to a custom type definition for a given param using @param CustomType $variablename and that works great. However, the co...

Does Rust have a feature whereby I can create define potentially non-existent methods on traits? I realize that Option can be used to handle potentially non-existent properties but I don't know ho...

I parse a .yaml file and need to unmarshal one of its properties in a custom manner. I am using the "gopkg.in/yaml.v2" package. The property in question is stored like this in my .yaml file: end...

I have made some custom Data types for number representation in Haskell, now I want to implement Eq instances for it, but I am somehow stuck. So I have already made: data Digit = Zero | One | Two...

I'm developing an API as RESTful as possible (though the HATEOAS constraint is not met thus it is not a REST API per se) I'm versioning the API, and since there are several ways to do this, I think...

I am trying to test a form type I have creating that uses a field with class entity here is the creation of the form $builder ->add('name', 'text') ->add('description', 'textarea') ->ad...

Having this table structure: CREATE TABLE `tableName` ( `Id` int unsigned NOT NULL AUTO_INCREMENT PRIMARY KEY, `Status` enum('pending','rejected','sent','invalid') NOT NULL, `Body` varchar(255)...

I have the following custom type on Postgres: CREATE TYPE my_custom_type AS ( field_a VARCHAR, field_b NUMERIC(10,3) ); and the following table: CREATE TABLE my_table ( COL1 VARCHAR(120) NO...

How do I write a custom Long class to handle long values in Oracle, to avoid the following error? Caused by: java.sql.SQLException: Stream has already been closed. Thanks

Display posts with 'Product' type ordered by 'Price' custom field: $query = new WP_Query( array ( 'post_type' => 'product', 'orderby' => 'meta_value', 'meta_key' => 'price' ) ); ...

Is it possible to make an enum using just numbers in C#? In my program I have a variable, Gain, that can only be set to 1, 2, 4, and 8. I am using a propertygrid control to display and set this val...

I have an array A of objects, each with the public field Value (double) which have random doubles between 0 and 1. A is sorted by this field. I create double random = 0.25. Now I want to find the f...

I am looking to create a type family that would represent data sizes (Byte, KB...). for that, the idea is to build a base type to have the real sizes based on: type SizeUnit = Int type B = SizeU...

I'm trying to create a permalink pattern for a Custom Type, that includes one of its taxonomies. The taxonomy name is known from the start (so I'm not trying to add or mix all of its taxonomies, ju...

I'm developing an application on the datagridview filtering. I'm using RowFilter property of the dataview for the filtering data. My database table contains int & varchar data type fields. And ...

I'd like to know why one is able to create a new attribute ("new" means "not previously defined in the class body") for an instance of a custom type, but is not able to do the same for a built-in t...