1 files changed, 87 insertions, 0 deletions
diff --git a/src/seastar/fmt/test/ranges-test.cc b/src/seastar/fmt/test/ranges-test.cc
new file mode 100644
index 00000000..77b4ced5
--- /dev/null
+++ b/src/seastar/fmt/test/ranges-test.cc
@@ -0,0 +1,87 @@
+// Formatting library for C++ - the core API
+//
+// Copyright (c) 2012 - present, Victor Zverovich
+// All rights reserved.
+//
+// For the license information refer to format.h.
+//
+// Copyright (c) 2018 - present, Remotion (Igor Schulz)
+// All Rights Reserved
+// {fmt} support for ranges, containers and types tuple interface.
+
+/// Check if  'if constexpr' is supported.
+#if (__cplusplus > 201402L) || \
+    (defined(_MSVC_LANG) && _MSVC_LANG > 201402L && _MSC_VER >= 1910)
+
+#include "fmt/ranges.h"
+#include "gtest.h"
+
+#include <vector>
+#include <array>
+#include <map>
+#include <string>
+
+TEST(RangesTest, FormatVector) {
+  std::vector<int32_t> iv{1, 2, 3, 5, 7, 11};
+  auto ivf = fmt::format("{}", iv);
+  EXPECT_EQ("{1, 2, 3, 5, 7, 11}", ivf);
+}
+
+TEST(RangesTest, FormatVector2) {
+  std::vector<std::vector<int32_t>> ivv{{1, 2}, {3, 5}, {7, 11}};
+  auto ivf = fmt::format("{}", ivv);
+  EXPECT_EQ("{{1, 2}, {3, 5}, {7, 11}}", ivf);
+}
+
+TEST(RangesTest, FormatMap) {
+  std::map<std::string, int32_t> simap{{"one", 1}, {"two", 2}};
+  EXPECT_EQ("{(\"one\", 1), (\"two\", 2)}", fmt::format("{}", simap));
+}
+
+TEST(RangesTest, FormatPair) {
+  std::pair<int64_t, float> pa1{42, 3.14159265358979f};
+  EXPECT_EQ("(42, 3.14159)", fmt::format("{}", pa1));
+}
+
+TEST(RangesTest, FormatTuple) {
+  std::tuple<int64_t, float, std::string, char> tu1{42, 3.14159265358979f,
+                                              "this is tuple", 'i'};
+  EXPECT_EQ("(42, 3.14159, \"this is tuple\", 'i')", fmt::format("{}", tu1));
+}
+
+struct my_struct {
+  int32_t i;
+  std::string str;  // can throw
+  template <std::size_t N>
+  decltype(auto) get() const noexcept {
+    if constexpr (N == 0)
+      return i;
+    else if constexpr (N == 1)
+      return fmt::string_view{str};
+  }
+};
+
+template <std::size_t N>
+decltype(auto) get(const my_struct& s) noexcept {
+  return s.get<N>();
+}
+
+namespace std {
+
+template <>
+struct tuple_size<my_struct> : std::integral_constant<std::size_t, 2> {};
+
+template <std::size_t N>
+struct tuple_element<N, my_struct> {
+  using type = decltype(std::declval<my_struct>().get<N>());
+};
+
+}  // namespace std
+
+TEST(RangesTest, FormatStruct) {
+  my_struct mst{13, "my struct"};
+  EXPECT_EQ("(13, \"my struct\")", fmt::format("{}", mst));
+}
+
+#endif  // (__cplusplus > 201402L) || (defined(_MSVC_LANG) && _MSVC_LANG >
+        // 201402L && _MSC_VER >= 1910)