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2026-09-13 13:30:21 +08:00
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+// Copyright (c) 2017-2026, University of Cincinnati, developed by Henry Schreiner
+// under NSF AWARD 1414736 and by the respective contributors.
+// All rights reserved.
+//
+// SPDX-License-Identifier: BSD-3-Clause
+
+#include "app_helper.hpp"
+
+#include <complex>
+#include <cstdint>
+#include <iomanip>
+#include <iostream>
+#include <locale>
+#include <numeric>
+#include <string>
+#include <utility>
+#include <vector>
+
+// Custom facet for thousands separator
+class CustomThousandsSeparator : public std::numpunct<char> {
+  protected:
+    char do_thousands_sep() const override { return '|'; }     // Space separator
+    std::string do_grouping() const override { return "\2"; }  // Group digits in sets of 2
+};
+
+#if CLI11_HAS_RTTI != 0
+// derived from https://github.com/CLIUtils/CLI11/pull/1160
+TEST_CASE_METHOD(TApp, "locale", "[separators]") {
+    std::locale customLocale(std::locale::classic(), new CustomThousandsSeparator);
+    std::locale::global(customLocale);  // Set as the default system-wide locale
+
+    // Ensure standard streams use the custom locale automatically
+    std::cout.imbue(std::locale());
+    std::int64_t foo{0};
+    std::uint64_t bar{0};
+    float qux{0};
+
+    app.add_option("FOO", foo, "Foo option")->default_val(1234567)->force_callback();
+    app.add_option("BAR", bar, "Bar option")->default_val(2345678)->force_callback();
+    app.add_option("QUX", qux, "QUX option")->default_val(3456.78)->force_callback();
+
+    CHECK_NOTHROW(run());
+    CHECK(foo == 1234567);
+    CHECK(bar == 2345678);
+    CHECK_THAT(qux, Catch::Matchers::WithinAbs(3456.78, 0.01));
+}
+#endif