From 0e8a0f4d32b4d0194914164c980e596213c10f99 Mon Sep 17 00:00:00 2001
From: Shen-Ta Hsieh <ibmibmibm.tw@gmail.com>
Date: Wed, 16 Sep 2026 13:25:54 +0800
Subject: [PATCH] Correct the spelling of rounding_mode under the toward zero
 macro

- cfenv.hpp wrote rounding_mde in the branch of BOOST_DECIMAL_FE_DEC_TOWARD_ZERO, thus
  no program which defines the macro compiled.
- A new test builds with the macro and makes sure that a quotient of either sign drops
  its extra digits.

Fixes #1457
---
 include/boost/decimal/cfenv.hpp    |  2 +-
 test/Jamfile                       |  1 +
 test/test_toward_zero_rounding.cpp | 38 ++++++++++++++++++++++++++++++
 3 files changed, 40 insertions(+), 1 deletion(-)
 create mode 100644 test/test_toward_zero_rounding.cpp

diff --git a/include/boost/decimal/cfenv.hpp b/include/boost/decimal/cfenv.hpp
index 6636c2a65..4cbf2ed2c 100644
--- a/include/boost/decimal/cfenv.hpp
+++ b/include/boost/decimal/cfenv.hpp
@@ -72,7 +72,7 @@ BOOST_DECIMAL_INLINE_CONSTEXPR_VARIABLE auto _boost_decimal_global_rounding_mode
     #elif defined(BOOST_DECIMAL_FE_DEC_TO_NEAREST_FROM_ZERO)
     rounding_mode::fe_dec_to_nearest_from_zero
     #elif defined (BOOST_DECIMAL_FE_DEC_TOWARD_ZERO)
-    rounding_mde::fe_dec_toward_zero
+    rounding_mode::fe_dec_toward_zero
     #elif defined(BOOST_DECIMAL_FE_DEC_UPWARD)
     rounding_mode::fe_dec_upward
     #else
diff --git a/test/Jamfile b/test/Jamfile
index 47cbcc96a..54b970b42 100644
--- a/test/Jamfile
+++ b/test/Jamfile
@@ -226,6 +226,7 @@ run test_tgamma.cpp ;
 run test_to_chars.cpp ;
 run test_to_string.cpp ;
 run test_total_ordering.cpp ;
+run test_toward_zero_rounding.cpp ;
 run test_upward_rounding.cpp ;
 run test_zeta.cpp ;
 
diff --git a/test/test_toward_zero_rounding.cpp b/test/test_toward_zero_rounding.cpp
new file mode 100644
index 000000000..05bd8f00c
--- /dev/null
+++ b/test/test_toward_zero_rounding.cpp
@@ -0,0 +1,38 @@
+// Copyright 2026 Matt Borland
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+// The mode is compile time, thus the test runs on every platform
+#define BOOST_DECIMAL_FE_DEC_TOWARD_ZERO
+
+#include <boost/decimal.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+using namespace boost::decimal;
+using namespace boost::decimal::literals;
+
+// A quotient of either sign drops its extra digits; downward gives -0.6666667
+template <typename T>
+void test(const T two, const T three, const T quotient)
+{
+    BOOST_TEST_EQ(two / three, quotient);
+    BOOST_TEST_EQ(-two / three, -quotient);
+}
+
+int main()
+{
+    BOOST_TEST(_boost_decimal_global_rounding_mode == rounding_mode::fe_dec_toward_zero);
+    BOOST_TEST(boost::decimal::fegetround() == rounding_mode::fe_dec_toward_zero);
+
+    static_assert(-2_DF / 3_DF == -0.6666666_DF, "");
+    static_assert(-2_DL / 3_DL == -0.6666666666666666666666666666666666_DL, "");
+
+    test(2_DF, 3_DF, 0.6666666_DF);
+    test(2_DFF, 3_DFF, 0.6666666_DFF);
+    test(2_DD, 3_DD, 0.6666666666666666_DD);
+    test(2_DDF, 3_DDF, 0.6666666666666666_DDF);
+    test(2_DL, 3_DL, 0.6666666666666666666666666666666666_DL);
+    test(2_DLF, 3_DLF, 0.6666666666666666666666666666666666_DLF);
+
+    return boost::report_errors();
+}