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69 lines
1.7 KiB
Go
69 lines
1.7 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package util
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import "unsafe"
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// EqualPtrs returns whether the values contained within two comparable ptr types are equal.
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func EqualPtrs[T comparable](t1, t2 *T) bool {
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switch {
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case t1 == nil:
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return (t2 == nil)
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case t2 == nil:
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return false
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default:
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return (*t1 == *t2)
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}
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}
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// Ptr returns a pointer to the passed in type
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func Ptr[T any](t T) *T {
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return &t
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}
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// PtrIf returns ptr value only if 't' non-zero.
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func PtrIf[T comparable](t T) *T {
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var z T
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if t == z {
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return nil
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}
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return &t
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}
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// PtrOrZero returns either value of ptr, or zero.
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func PtrOrZero[T any](t *T) T {
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if t == nil {
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var z T
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return z
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}
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return *t
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}
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// PtrOrValue returns either contained value of ptr, or 'value'.
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func PtrOrValue[T any](t *T, value T) T {
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if t != nil {
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return *t
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}
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return value
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}
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func IsNil(i interface{}) bool {
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type eface struct{ _, data unsafe.Pointer }
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return (*eface)(unsafe.Pointer(&i)).data == nil
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}
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