Struct Implicit Default Constructor vs. Parameterless Constructor

Question

OK, we hear that structcannot have a default parameterless constructor which is fine (http://stackoverflow.com/questions/333829/why-cant-i-define-a-default-constructor-for-a-struct-in-net). But documentation says "Each value type has an implicit default constructor that initializes the default value of that type." from http://msdn.microsoft.com/en-us/library/s1ax56ch.aspx

What's the difference between implicit default constructor and parameterless default constructor right now?

score 6 · Accepted Answer · answered Jun 03 '12 at 02:03

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The implicit default constructor is the parameterless constructor which is automatically created by the compiler. The reason you can't create a parameterless constructor is because the default one already exists. I don't know why they chose to do it this way, and why you're not allowed to override it.

answered Jun 03 '12 at 02:03

HypnoToad

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It is the same with class but you can override it :) – Tarik Jun 03 '12 at 02:05
As it admits it only really half answers the question. – Mark Hurd Jun 06 '12 at 10:23

Mark Hurd · Answer 2 · 2012-06-03T02:13:56.743

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As explained in the answer you point to, using IL, you can define a parameterless constructor for a struct, but there are scenarios where it is not called.

IMHO the "implicit" constructor is just a logical one; implied by the memory being zeroed out when it is allocated.

edited Jun 03 '12 at 02:13

answered Jun 03 '12 at 02:06

Mark Hurd

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You can see that answer in my question. I linked it already actually :) – Tarik Jun 03 '12 at 02:08

Struct Implicit Default Constructor vs. Parameterless Constructor

2 Answers2