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f468919f95
Updates #5590 (which deprecated it, 2.5 years ago) Change-Id: I137e82855ee33d91e5639b909f7ca64e237ed6ba Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
37 lines
1.0 KiB
Go
37 lines
1.0 KiB
Go
// Copyright (c) Tailscale Inc & AUTHORS
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// SPDX-License-Identifier: BSD-3-Clause
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// Package mak helps make maps. It contains generic helpers to make/assign
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// things, notably to maps, but also slices.
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package mak
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// Set populates an entry in a map, making the map if necessary.
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//
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// That is, it assigns (*m)[k] = v, making *m if it was nil.
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func Set[K comparable, V any, T ~map[K]V](m *T, k K, v V) {
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if *m == nil {
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*m = make(map[K]V)
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}
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(*m)[k] = v
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}
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// NonNilSliceForJSON makes sure that *slicePtr is non-nil so it will
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// won't be omitted from JSON serialization and possibly confuse JavaScript
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// clients expecting it to be present.
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func NonNilSliceForJSON[T any, S ~[]T](slicePtr *S) {
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if *slicePtr != nil {
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return
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}
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*slicePtr = make([]T, 0)
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}
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// NonNilMapForJSON makes sure that *slicePtr is non-nil so it will
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// won't be omitted from JSON serialization and possibly confuse JavaScript
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// clients expecting it to be present.
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func NonNilMapForJSON[K comparable, V any, M ~map[K]V](mapPtr *M) {
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if *mapPtr != nil {
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return
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}
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*mapPtr = make(M)
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}
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