英文:
col.ToStrings undefined (type Columns has no field or method ToStrings)
问题
我正在尝试创建一个表示指向另一种类型的指针切片的类型，并为其定义一个方法。我的代码看起来类似于这样，尽管为了示例而简化了一些：
package column
type Column struct {
name string
}
type Columns []*Column
func (c Column) ToString() string {
return c.name
}
func (c Columns) ToStrings() []string {
var strSlice []string
for _, v := range c {
strSlice = append(strSlice, v.ToString())
}
return strSlice
}
然后在另一个文件中这样调用：
import (
c "main/column"
"strings"
)
type Columns c.Columns
func ToString(col Columns) string {
return strings.Join(col.ToStrings(), ",\n")
}
然而，当我尝试在导出的"Columns"类型上调用方法ToStrings()时，我得到了这个错误：
columns.ToStrings undefined (type Columns has no field or method ToStrings)
似乎编译器找不到定义在"Columns"类型上的方法ToStrings()。有没有办法解决这个问题？为什么编译器找不到"Columns"类型定义的导出方法？
英文:
I am attempting to create a type that represents a slice of pointers to another type and define a method for it, my code looks similar to this, albeit a bit simplified for the example:
package column
type Column struct {
name string
}
type Columns []*Column
func (c Column) ToString() string {
return c.name
}
func (c Columns) ToStrings() []string {
var strSlice []string
for _, v := range c {
strSlice = append(strSlice, v.ToString())
}
return strSlice
}
It is then called in a separate file like this:
import (
c "main/column"
"strings"
)
type Columns c.Columns
func ToString(col Columns) string {
return strings.Join(col.ToStrings(), ",\n")
}
However when I try to call the method ToStrings() on the exported "Columns" type I get this error:
> columns.ToStrings undefined (type Columns has no field or method
> ToStrings)
It seems the compiler can't find the method ToStrings(). Is there a way around this? Why can't the compiler find the exported method defined for the "Columns" type?
答案1
得分: 0
type Columns c.Columns 创建了一个全新的类型，并具有新的方法集。这样做的唯一原因是为了明确地移除现有类型的方法。
英文:
type Columns c.Columns creates an entirely new type, with a new method set. The only reason to do this is to specifically remove the methods of the exiting type.
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