Implement public, non-struct Wrap() and WrapContext() functions

wrap.go

@@ -0,0 +1,28 @@
+package ratelimit
+
+import (
+	"context"
+	"time"
+)
+
+// Wrap wraps the passed function within another function, which no parameters
+// and calls RateLimit using fn(). Helpful for building functions which are "preloaded" with
+// a rate limiter, rather than calling RateLimit around every function call.
+func Wrap(fn RateLimiterFn, callsPerInterval int64, interval time.Duration) WrappedFn {
+	r := NewRateLimiter(callsPerInterval, interval)
+
+	return func() error {
+		return r.RateLimit(fn)
+	}
+}
+
+// WrapContext wraps the passed function within another function, which takes a single context.Context parameter
+// and calls RateLimitContext using fn() and that context. Helpful for building functions which are "preloaded" with
+// a rate limiter, rather than calling RateLimitContext around every function call.
+func WrapContext(fn RateLimiterFn, callsPerInterval int64, interval time.Duration) WrappedFnContext {
+	r := NewRateLimiter(callsPerInterval, interval)
+
+	return func(ctx context.Context) error {
+		return r.RateLimitContext(ctx, fn)
+	}
+}