From 5edd2cec4e14735bc1664324277c534f0564141e Mon Sep 17 00:00:00 2001
From: Nikolay Rapotkin <v-nirapo@microsoft.com>
Date: Fri, 13 Mar 2020 11:20:24 +0300
Subject: [PATCH] Ability to join elements of std::initializer_list was added

---
 include/fmt/ranges.h | 25 +++++++++++++++++++++++++
 test/ranges-test.cc  |  7 +++++++
 2 files changed, 32 insertions(+)

diff --git a/include/fmt/ranges.h b/include/fmt/ranges.h
index 6110fdaf..0e8f1608 100644
--- a/include/fmt/ranges.h
+++ b/include/fmt/ranges.h
@@ -12,7 +12,9 @@
 #ifndef FMT_RANGES_H_
 #define FMT_RANGES_H_
 
+#include <initializer_list>
 #include <type_traits>
+
 #include "format.h"
 
 // output only up to N items from the range.
@@ -360,6 +362,29 @@ FMT_CONSTEXPR tuple_arg_join<wchar_t, T...> join(const std::tuple<T...>& tuple,
   return {tuple, sep};
 }
 
+/**
+  \rst
+  Returns an object that formats `initializer_list` with elements separated by
+  `sep`.
+
+  **Example**::
+
+    fmt::print("{}", fmt::join({1, 2, 3}, ", "));
+    // Output: "1, 2, 3"
+  \endrst
+ */
+template <typename T>
+arg_join<internal::iterator_t<const std::initializer_list<T>>, char> join(
+    std::initializer_list<T> list, string_view sep) {
+  return join(std::begin(list), std::end(list), sep);
+}
+
+template <typename T>
+arg_join<internal::iterator_t<const std::initializer_list<T>>, wchar_t> join(
+    std::initializer_list<T> list, wstring_view sep) {
+  return join(std::begin(list), std::end(list), sep);
+}
+
 FMT_END_NAMESPACE
 
 #endif  // FMT_RANGES_H_
diff --git a/test/ranges-test.cc b/test/ranges-test.cc
index 265f9acd..e47f8c2f 100644
--- a/test/ranges-test.cc
+++ b/test/ranges-test.cc
@@ -10,6 +10,7 @@
 // {fmt} support for ranges, containers and types tuple interface.
 
 #include "fmt/ranges.h"
+
 #include "gtest.h"
 
 // Check if  'if constexpr' is supported.
@@ -68,6 +69,12 @@ TEST(RangesTest, JoinTuple) {
   EXPECT_EQ("4.0", fmt::format("{}", fmt::join(t4, "/")));
 }
 
+TEST(RangesTest, JoinInitializerList) {
+  EXPECT_EQ("1, 2, 3", fmt::format("{}", fmt::join({1, 2, 3}, ", ")));
+  EXPECT_EQ("fmt rocks !",
+            fmt::format("{}", fmt::join({"fmt", "rocks", "!"}, " ")));
+}
+
 struct my_struct {
   int32_t i;
   std::string str;  // can throw