将一个结构复制到另一个具有相同成员和不同类型的结构

Question

I have two struct having the same members, I want to copy one struct to another, see the pseudo code below:

type Common struct {
    Gender int
    From   string
    To     string
}

type Foo struct {
    Id    string
    Name  string
    Extra Common
}

type Bar struct {
    Id    string
    Name  string
    Extra Common
}

Then I have foo of struct Foo, and bar of struct Bar, Is there any way to copy bar from foo?

Answer 1

Use a conversion. The following code uses a conversion to a copy a value of type Foo to a value of type Bar:

foo := Foo{Id: "123", Name: "Joe"}
bar := Bar(foo)

playground example

The conversion only works when the underlying types are identical except for struct tags.