go switch 与 interface

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前言

github.com/google/cel-go/common/types/ref

type Val interface {
	// ConvertToNative converts the Value to a native Go struct according to the
	// reflected type description, or error if the conversion is not feasible.
	ConvertToNative(typeDesc reflect.Type) (interface{}, error)

	// ConvertToType supports type conversions between value types supported by
	// the expression language.
	ConvertToType(typeValue Type) Val

	// Equal returns true if the `other` value has the same type and content as
	// the implementing struct.
	Equal(other Val) Val

	// Type returns the TypeValue of the value.
	Type() Type

	// Value returns the raw value of the instance which may not be directly
	// compatible with the expression language types.
	Value() interface{}
}

当我们实现了一个interface时，使用swtich case去判断，会命中哪条结果？

switch i := v.(type) {
	case ref.Val:
		return resolveType(i.Value())
	case *CustomType:
		return resolveType(i.Value())
	default:
		
	}

经过测试发现，谁的case靠前，会命中谁，哪怕CustomType有一些私有方法
后面空了看看switch 底层实现。。

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go switch 与 interface

前言