[英]In haskell, What does :+: mean in data type definition?
This is the definition for a new data type: 这是新数据类型的定义:
data Total a = Total a :+: Total a
|...
What does :+: mean in this type definition? 什么:+:在这种类型定义中意味着什么?
It is a data constructor written in infix form. 它是以中缀形式编写的数据构造函数。 You can have an operator as constructor if it begins with :
. 如果操作符以构造函数开头,则可以使用:
。
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