/
pointer.go
57 lines (44 loc) · 1.19 KB
/
pointer.go
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package pointer
import "reflect"
// Pointer returns the pointer of the given value.
func Pointer[T any](t T) *T {
return &t
}
// PointerOrDefault returns the pointer of the given value.
// If the given value is equal to the zero value, the pointer of the default value will be returned instead.
func PointerOrDefault[T any](t T, defaultValue T) *T {
if IsZero(t) {
return Pointer(defaultValue)
}
return Pointer(t)
}
// PointerOrNil returns the pointer of the given value or nil if given value is equal to zero value.
func PointerOrNil[T any](t T) *T {
if IsZero(t) {
return nil
}
return Pointer(t)
}
// SafeDeref returns the value from the passed pointer or zero value for a nil pointer.
func SafeDeref[T any](t *T) T {
if t == nil {
var zero T
return zero
}
return *t
}
// SafeDerefOrDefault returns the value from the passed pointer or the default value for a nil pointer or zero value.
func SafeDerefOrDefault[T any](t *T, defaultValue T) T {
if t == nil {
return defaultValue
}
if IsZero(*t) {
return defaultValue
}
return *t
}
// IsZero returns true if the passed value equals its zero value.
func IsZero[T any](t T) bool {
var zero T
return reflect.DeepEqual(t, zero)
}