reflectpro

Reflectpro

Simple, elegant, and intuitive callers, copiers, getters and setters.

Examples

Caller

In the following example, we have a pointer to any that stores a struct, instead of having a direct pointer to a struct. The receiver is a pointer, so eventually we cannot call the given method. Caller handles that by creating a pointer to a copy of that value.

type Person struct {
	name string
	age  int
}

func (p *Person) SetName(n string) {
	p.name = n
}

func Example() {
	var p any
	p := &Person{age: 25}
	_, _ = caller.CallMethod(p, "SetName", []any{"Mary"}, false)
	fmt.Printf("%+v\n", p)
	// Output: &{name:Mary age:25}
}

Copier

var (
    from = []any{int(1), uint(2), float32(3), float64(4)}
    to   []uint64
)
_ = copier.Copy(from, &to, true) // convert
fmt.Printf("%#v\n", to)
// Output: []uint64{0x1, 0x2, 0x3, 0x4}

Getter

In the following example, we read an unexported field of the given struct.

person := struct {
    name string
}{
    name: "Mary",
}
v, _ := getter.Get(person, "name")
fmt.Println(v)
// Output: Mary

Setter

In the following example, we have a pointer to any that stores a struct, instead of having a direct pointer to a struct. Since it is an unaddressable value, the reflect package from the standard library does not allow assigning a new value to this field. Setter handles that by creating an addressable copy.

var person any
person = struct {
    name string
}{}
_ = setter.Set(&person, "name", "Mary", false)
fmt.Println(person)
// Output: {Mary}