From 373f49da92fb9c34115279a210f29067b6259e35 Mon Sep 17 00:00:00 2001
From: Akira Takahashi <faithandbrave@gmail.com>
Date: Wed, 25 Jan 2023 11:56:38 +0900
Subject: [PATCH] =?UTF-8?q?range=5Fformatter=20:=20=E3=82=B5=E3=83=B3?=
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---
 reference/format/range_formatter.md | 32 ++++++++++++++++++++++++++---
 1 file changed, 29 insertions(+), 3 deletions(-)

diff --git a/reference/format/range_formatter.md b/reference/format/range_formatter.md
index 5b0cec189a..7f3190b223 100644
--- a/reference/format/range_formatter.md
+++ b/reference/format/range_formatter.md
@@ -41,7 +41,31 @@ namespace std {
 #include <vector>
 
 template <class T>
-class std::range_formatter<std::vector<T>> : public std::range_formatter<std::vector<T>> {
+class MyVector {
+  std::vector<T> v_;
+public:
+  using base_type = std::vector<T>;
+  using iterator = typename base_type::iterator;
+  using const_iterator = typename base_type::iterator;
+  using value_type = typename base_type::value_type;
+  using reference = typename base_type::reference;
+  using const_reference = typename base_type::const_reference;
+
+  MyVector() = default;
+  MyVector(std::initializer_list<T> init)
+      : v_(init.begin(), init.end()) {}
+
+  iterator begin() { v_.begin(); }
+  const_iterator begin() const { v_.begin(); }
+
+  iterator end() { v_.end(); }
+  const_iterator end() const { v_.end(); }
+
+  const std::vector<T>& base() const { return v_; }
+};
+
+template <class T>
+class std::range_formatter<MyVector<T>> : public std::range_formatter<std::vector<T>> {
   bool is_colon = false;
   using base_type = std::range_formatter<std::vector<T>>;
 public:
@@ -63,7 +87,7 @@ public:
   // format()関数は書式の情報をもたない。
   // parse()関数で解析した書式をメンバ変数で保持しておいて、
   // それをもとに書式化する
-  auto format(const std::vector<T>& v, std::format_context& fctx) const {
+  auto format(const MyVector<T>& v, std::format_context& fctx) const {
     if (is_colon) {
       auto out = fctx.out();
       bool is_first = true;
@@ -80,10 +104,12 @@ public:
       }
       return out;
     }
-    return base_type::format(v, fctx);
+    return base_type::format(v.base(), fctx);
   }
 };
 
+#include <cstdint>
+
 int main()
 {
   std::vector<std::uint8_t> v = {0xaa, 0xbb, 0xcc, 0xdd, 0xee, 0xff};