doujingdai5521
2017-10-22 07:29
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如何在golang中为变量分配运算符?

Is it possible to assign an infix operator to a variable?

operator := <<

If so how is it applied to arguments?

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  • dongzhong8691 2017-10-22 14:20
    已采纳

    No, it's not possible to store an operator in a variable.

    Perhaps the best way is to define a set of operations and have a wrapper struct with an Apply method:

    type Operation int
    
    const (
      Left Operation = iota
      Right
    )
    
    type State struct {
      Value int
    }
    
    func (s *State) Apply(o Operation) {
      switch (o) {
        case Left:
           s.Value = s.value << 1
        case Right:
           s.Value = s.value >> 1
      }
    }
    

    Sample use:

    value := State{4} // original value
    op := Left
    value.Apply(op) // s.Value is now 8
    
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