如何将自定义类型转换为字符串？

Question

I'm using a package and instead of returning a string, it returns a economy.ClassId You can see here

I want to pass the economy.ClassId which is just a string of numbers like "531569319" to a function that takes a string not a economy.ClassId so is there a way to convert this type to a string or no. Thanks.

I know you could like strconv.FormatUint() but what would I use for a custom type.

Answer 1

ClassId is declared as type ClassId uint64, so although a ClassId isn't exactly the same as a uint64, they have the same underlying type, and you can therefore convert from one to the other. To convert a value x to type T (when permitted), you write T(x). So, in your case:

 funcThatTakesAString(strconv.FormatUint(uint64(classId), 10))