github.com/zaolin/u-root@v0.0.0-20200428085104-64aaafd46c6d/cmds/core/elvish/eval/vals/bool.go (about)

     1  package vals
     2  
     3  // Booler wraps the Bool method.
     4  type Booler interface {
     5  	// Bool computes the truth value of the receiver.
     6  	Bool() bool
     7  }
     8  
     9  // Bool converts a value to bool. It is implemented for the builtin bool type
    10  // and types implementing the Booler interface. For all other values, it returns
    11  // true.
    12  func Bool(v interface{}) bool {
    13  	switch v := v.(type) {
    14  	case Booler:
    15  		return v.Bool()
    16  	case bool:
    17  		return v
    18  	}
    19  	return true
    20  }