Struct vs. Class

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Struct vs. Class

這篇介紹Struct和Class兩者資料結構的特性以及使用時機。

兩者比較

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Class				Struct
Reference type			value type
可繼承				不可繼承
可變更				不可變更
				不能有預設建構子

使用時機

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當下列4個條件完全符合時，才建議使用Struct資料結構。
沒有完全符合條件時，建議使用Class資料結構。
defining a struct unless the type has all of the following characteristics:

1.It logically represents a single value, similar to primitive types (int, double, > > etc.).
2.It has an instance size under 16 bytes.
3.It is immutable.
4.It will not have to be boxed frequently.
In all other cases, you should define your types as classes.