ポインタ経由でメソッドを呼び出す

call_pointer_method_in_template_by_pointer.go

package main

import (
	"os"
	"text/template"
)

type Person struct {
	Name string
	City string
}

func (p *Person) GetAge() int {
	return 36
}

func (p *Person) GetFutureAge(yearAfter int) int {
	return p.GetAge() + yearAfter
}

func main() {
	tmpl, err := template.New("test").Parse("{{.Name}}({{.GetAge}}) lives in {{.City}}. 2 years later he is {{.GetFutureAge 2}}.")
	if err != nil {
		panic(err)
	}
	p := &Person{"pinzolo", "Kyoto"}
	err = tmpl.Execute(os.Stdout, p)
	if err != nil {
		panic(err)
	}
}

call_struct_method_in_template_by_pointer.go

package main

import (
	"os"
	"text/template"
)

type Person struct {
	Name string
	City string
}

func (p Person) GetAge() int {
	return 36
}

func (p Person) GetFutureAge(yearAfter int) int {
	return p.GetAge() + yearAfter
}

func main() {
	tmpl, err := template.New("test").Parse("{{.Name}}({{.GetAge}}) lives in {{.City}}. 2 years later he is {{.GetFutureAge 2}}.")
	if err != nil {
		panic(err)
	}
	p := &Person{"pinzolo", "Kyoto"}
	err = tmpl.Execute(os.Stdout, p)
	if err != nil {
		panic(err)
	}
}