From: Matt Joiner <anacrolix@gmail.com>
Date: Wed, 12 Jan 2022 03:20:55 +0000 (+1100)
Subject: Add some generic map helpers
X-Git-Tag: v1.42.0~8^2^2~16
X-Git-Url: http://www.git.stargrave.org/?a=commitdiff_plain;h=f4d4b59d8905791cff225e433ce175b8d4e2f004;p=btrtrc.git

Add some generic map helpers
---

diff --git a/generics/map.go b/generics/map.go
new file mode 100644
index 00000000..23ee5c58
--- /dev/null
+++ b/generics/map.go
@@ -0,0 +1,15 @@
+package generics
+
+func MakeMapIfNilAndSet[K comparable, V any](pm *map[K]V, k K, v V) {
+	m := *pm
+	if m == nil {
+		m = make(map[K]V)
+		*pm = m
+	}
+	m[k] = v
+}
+
+// Does this exist in the maps package?
+func MakeMap[K comparable, V any](pm *map[K]V) {
+	*pm = make(map[K]V)
+}