Generic Struct

Write

For generic struct provider

package collection

/*
example interface
type IntStringPair interface {
    First() int
    SetFirst(val int)
    Second() string
    SetSecond(val string)
}
*/
var pair = generic.
    Struct("pair").
    Params("I", "interface of the typed pair").
    Source(`
{{ $T1 := .I | method "First" | returnType }}
{{ $T2 := .I | method "Second" | returnType }}

type {{ .structName }} struct {
    first {{ $T1 }}
    second {{ $T2 }}
}

func (pair *{{ .structName }}) SetFirst(val {{ $T1|name }}) {
    pair.first = val
}

func (pair *{{ .structName }}) First() {{ $T1|name }} {
    return pair.first
}
`)

var NewPair = generic.
    Func("NewPair").
    Params("I", "interface of the typed pair").
    ImportStruct(pair).
    Source(`
{{ $pair = expand "pair" "I" .I }}

func {{ .funcName }} () {{ .I|name }} {
    return &{{ $pair }}{}
}
`)

Use

For generic struct user

type IntStringPair interface {
    First() int
    SetFirst(val int)
    Second() string
    SetSecond(val string)
}
newPair := generic.Expand(collection.NewPair, 
    "I", reflect.TypeOf(new(IntStringPair)).Elem()).
    (func() IntStringPair)
pair := newPair()
pair.First() // 0
pair.SetFirst(1)
pair.First() // 1