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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for March 27th, 2019

A while ago, Lars Fosdal was on a .NET and C# link spree. Some of his links are here

Posted by jpluimers on 2019/03/27

–jeroen

Posted in .NET, Development, Software Development | Leave a Comment »

Value types not having parameterless constructors…

Posted by jpluimers on 2019/03/27

The list below is based on a G+ discussion in a single language, but has way broader aspects.

It’s on value types, mutability, parameterless constructors and expectations of compiled code.

I’ve bitten myself in the foot with mutable types in too many languages too often, so I started advocating this years ago at clients, and now in this blog-post.

TL;DR:

  • some languages disallow parameterless constructors: C++, C# and Delphi are examples
  • this historically stems from the C++ and C# background
  • it has to do with them not wanting to automatically call them upon array initialisation taking a lot of CPU time
  • most languages do not stop you from making mutable value types, but in practice your value types should be immutable as otherwise you will open a can of worms, for instance you will have a hard time:
    • preventing threading issues
    • making code following functional patterns
    • scaling your code by making your algorithms supporting parallel execution
  • parameterless constructors include constructors with parameters having default values

Some links that explain this in more depth:

The “just pass them as reference” often seen as reason to explain “mutable value types are OK” is exactly describing why they are not OK.

–jeroen

Posted in .NET, C#, C++, Delphi, Development, Software Development | 2 Comments »

When I ever go and use the Spring4D activator, these are some URLs I need to re-read

Posted by jpluimers on 2019/03/27

When I ever go and use the Spring4D activator, these are some URLs I need to re-read:

–jeroen

Posted in Delphi, Development, Software Development, Spring4D | Leave a Comment »

 
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