Add test set

Author: mborland

include/boost/decimal.hpp

@@ -15,5 +15,6 @@
 #include <boost/decimal/literals.hpp>
 #include <boost/decimal/hash.hpp>
 #include <boost/decimal/cfloat.hpp>
+#include <boost/decimal/format.hpp>
 
 #endif // BOOST_DECIMAL_HPP

test/Jamfile

@@ -52,6 +52,7 @@ run test_exp.cpp ;
 run test_expm1.cpp ;
 run test_fenv.cpp ;
 run test_float_conversion.cpp ;
+run test_format.cpp ;
 run test_frexp_ldexp.cpp ;
 run test_git_issue_266.cpp ;
 run test_git_issue_271.cpp ;

test/test_format.cpp

@@ -0,0 +1,59 @@
+// Copyright 2023 Matt Borland
+// Distributed under the Boost Software License, Version 1.0.
+// https://www.boost.org/LICENSE_1_0.txt
+
+#include <boost/decimal.hpp>
+#include <boost/core/lightweight_test.hpp>
+
+using namespace boost::decimal;
+
+#if __cplusplus >= 202002L || (defined(_MSVC_LANG) && _MSVC_LANG >= 202002L) && __has_include(<format>) && !defined(BOOST_DECIMAL_DISABLE_CLIB)
+
+#include <format>
+
+template <BOOST_DECIMAL_DECIMAL_FLOATING_TYPE T>
+void test()
+{
+/*
+    BOOST_TEST_EQ(std::format("{}", T{1}), "1");
+    BOOST_TEST_EQ(std::format("{}", T{10}), "1e+01");
+    BOOST_TEST_EQ(std::format("{}", T{100}), "1e+02");
+    BOOST_TEST_EQ(std::format("{}", T{1000}), "1e+03");
+    BOOST_TEST_EQ(std::format("{}", T{10000}), "1e+04");
+    BOOST_TEST_EQ(std::format("{}", T{210000}), "2.1e+05");
+    BOOST_TEST_EQ(std::format("{}", T{2100000}), "2.1e+06");
+    BOOST_TEST_EQ(std::format("{}", T{21, 6, true}), "-2.1e+07");
+    BOOST_TEST_EQ(std::format("{}", T{211, 6, true}), "-2.11e+08");
+    BOOST_TEST_EQ(std::format("{}", T{2111, 6, true}), "-2.111e+09");
+
+    BOOST_TEST_EQ(std::format("{}", std::numeric_limits<T>::infinity()), "inf");
+    BOOST_TEST_EQ(std::format("{}", -std::numeric_limits<T>::infinity()), "-inf");
+    BOOST_TEST_EQ(std::format("{}", std::numeric_limits<T>::quiet_NaN()), "nan");
+    BOOST_TEST_EQ(std::format("{}", -std::numeric_limits<T>::quiet_NaN()), "-nan(ind)");
+    BOOST_TEST_EQ(std::format("{}", std::numeric_limits<T>::signaling_NaN()), "nan(snan)");
+    BOOST_TEST_EQ(std::format("{}", -std::numeric_limits<T>::signaling_NaN()), "-nan(snan)");
+    */
+
+    constexpr const char* fmt_string = "{}";
+
+    BOOST_TEST_EQ(std::format(fmt_string, 1.0), "1");
+    BOOST_TEST_EQ(std::format(fmt_string, T{1}), "1");
+}
+
+int main()
+{
+    test<decimal32>();
+    //test<decimal64>();
+    //test<decimal128>();
+
+    return boost::report_errors();
+}
+
+#else
+
+int main()
+{
+    return 0;
+}
+
+#endif