From 8dcdc7bdacca24e8e7451f3196b692fc1ed7e181 Mon Sep 17 00:00:00 2001
From: Mateusz Pusz <mateusz.pusz@gmail.com>
Date: Sun, 23 Oct 2022 22:19:44 +0200
Subject: [PATCH] fix: printing of symbols with fractional powers fixed

---
 src/core/include/units/unit.h       | 4 ++--
 test/unit_test/static/unit_test.cpp | 4 ++++
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/core/include/units/unit.h b/src/core/include/units/unit.h
index 31604c86..31cd3827 100644
--- a/src/core/include/units/unit.h
+++ b/src/core/include/units/unit.h
@@ -642,8 +642,8 @@ constexpr auto unit_symbol_impl(Out out, const power<F, Num, Den...>&, unit_symb
   constexpr ratio r = power<F, Num, Den...>::exponent;
   if constexpr (r.den != 1) {
     // add root part
-    constexpr auto txt = txt + basic_fixed_string("^(") + regular<r.num>() + basic_fixed_string("/") +
-                         regular<r.den>() + basic_fixed_string(")");
+    constexpr auto txt = basic_fixed_string("^(") + regular<r.num>() + basic_fixed_string("/") + regular<r.den>() +
+                         basic_fixed_string(")");
     return copy<CharT>(txt, fmt.encoding, out);
   } else if constexpr (r.num != 1) {
     // add exponent part
diff --git a/test/unit_test/static/unit_test.cpp b/test/unit_test/static/unit_test.cpp
index 9df7d453..987df90b 100644
--- a/test/unit_test/static/unit_test.cpp
+++ b/test/unit_test/static/unit_test.cpp
@@ -478,6 +478,10 @@ static_assert(unit_symbol(kilogram / metre / square<second>, {.encoding = ascii,
               "kg m^-1 s^-2");
 static_assert(unit_symbol(kilogram / metre / square<second>, {.denominator = always_negative, .separator = dot}) ==
               "kg⋅m⁻¹⋅s⁻²");
+static_assert(unit_symbol(pow<123>(metre)) == "m¹²³");
+static_assert(unit_symbol(pow<1, 2>(metre)) == "m^(1/2)");
+static_assert(unit_symbol(pow<3, 5>(metre)) == "m^(3/5)");
+static_assert(unit_symbol(pow<1, 2>(metre / second)) == "m^(1/2)/s^(1/2)");
 
 #endif  // __cpp_lib_constexpr_string