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alloc.go
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alloc.go
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// Package alloc is intended to help make pointers to specified values with single call
// and also to get values from pointers safely to avoid nil dereference errors.
package alloc
import (
"time"
"golang.org/x/exp/constraints"
)
// Scope represents type constraints to allow generalized operations within this package.
type Scope interface {
constraints.Ordered | ~bool | time.Time | time.Duration
}
// New is generic function to allocate new pointer to specified value.
func New[V Scope](value V) *V {
return &value
}
// Deref is generic function to dereference a pointer.
// Returns referenced value and true for non nil pointer or type zero value and false otherwise.
func Deref[V Scope](ref *V) (V, bool) {
var zero V
if ref == nil {
return zero, false
}
return *ref, true
}
// Value is generic function to dereference a pointer.
// Returns referenced value for non nil pointer or type zero value otherwise.
func Value[V Scope](ref *V) V {
v, _ := Deref(ref)
return v
}
// Copy is generic function to duplicate specified pointer with referenced value.
// Returns new pointer for specified non nil reference or nil otherwise.
func Copy[V Scope](ref *V) *V {
if ref == nil {
return nil
}
return New(Value(ref))
}