From d4492524d1a5db146f82d578227634178211a27e Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Oliver=20Sch=C3=B6nrock?= <oliver@openbrackets.net>
Date: Sun, 23 Feb 2020 15:36:07 +0000
Subject: [PATCH] use assert. static can't work

---
 src/include/units/quantity_cast.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/include/units/quantity_cast.h b/src/include/units/quantity_cast.h
index 7c213780..d88c278a 100644
--- a/src/include/units/quantity_cast.h
+++ b/src/include/units/quantity_cast.h
@@ -24,13 +24,13 @@
 
 #include <units/concepts.h>
 #include <units/bits/dimension_op.h>
+#include <cassert>
 
 namespace units {
 
 constexpr std::intmax_t ipow10(std::intmax_t exp)
 {
-  // how to assert here?
-  // static_assert(exp >= 0, "Use fpow10() for negative exponents");
+  assert(exp >= 0);
   if (exp == 0) return 1;
   std::intmax_t result = 1;
   while (exp > 0) {