attr

Documentation

Overview

Package attr defines types and helpers for accessing typed attributes.

Index

• type Getter
• type Interface
  • func Int(f string) Interface
  • func String(f string) Interface
  • func Strings(f string) Interface

Types

type Getter

type Getter interface {
	GetInt(string) int
	GetString(string) string
	GetStrings(string) []string
}

Getter is an interface which is implemented by types which want to export typed values.

type Interface

type Interface interface {
	// Name returns the name of the attribute.
	Name() string

	// IsEmpty returns true iff `x` is a representation of the empty value of this attribute.
	IsEmpty(x interface{}) bool

	// Value returns the value of this attribute in `g`.
	Value(g Getter) interface{}

	// Intersect returns the intersection of `x` and `y`, assumed to be the type of the
	// attribute.
	Intersect(x, y interface{}) interface{}
}

Interface is a type which defines behaviour necessary to implement a typed attribute.

func Int

func Int(f string) Interface

Int constructs an implementation of Interface with the field name `f` to access an int attribute of an implementation of Getter.

func String

func String(f string) Interface

String constructs an implementation of Interface with the field name `f` to access a string attribute of an implementation of Getter.

func Strings

func Strings(f string) Interface

Strings constructs an implementation of Interface with the field name `f` to access a string slice attribute of an implementation of Getter.