golang中使用自定义类型

Go的自定义类型支持first-class，例如那些分配给一个已有类型的独立的标识符的类型，可以与原来的标识符区分开来

2018-12-20 07:22:39 catherine

package main
import "fmt"
type Traverser func(ele interface{})
type UserId string // <-- new type
type ProductId string
func AddProduct(UserId UserId, productId ProductId) {
    fmt.Println(UserId, productId)
}
func main() {
    userId := UserId("some-user-id")
    productId := ProductId("some-product-id")
    // Right order: all fine
    AddProduct(userId, productId)
    // Wrong order: would compile with raw strings
    AddProduct(productId, userId)
    // Compilation errors:
    // cannot use productId (type ProductId) as type UserId in argument to AddProduct
    // cannot use userId (type UserId) as type ProductId in argument to AddProduct
}

分类: web

标签: golang

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作者: catherine

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