c: support for values (#18)

Author: shoenig

Justfile

@@ -13,6 +13,12 @@ default:
 tidy:
     go mod tidy
 
+# run specific unit test
+[group('build')]
+[no-cd]
+test unit:
+    go test -v -count=1 -race -run {{unit}} 2>/dev/null
+
 # run tests across source tree
 [group('build')]
 tests:

context.go

@@ -42,3 +42,13 @@ func WithCancel(c C) (C, Cancel) {
 func WithTTL(c C, duration time.Duration) (C, Cancel) {
 	return context.WithTimeout(c, duration)
 }
+
+// WithValue wraps an existing Context with value set for key.
+func WithValue[K, V any](c C, key K, value V) C {
+	return context.WithValue(c, key, value)
+}
+
+// Value retrieves the value associated with the given key.
+func Value[K, V any](c C, key K) V {
+	return c.Value(key).(V)
+}