From b9063f9392b50efacb6c11c69cb46627720eed9e Mon Sep 17 00:00:00 2001
From: Walter Gray <walter.gray@getcruise.com>
Date: Sun, 20 Dec 2020 16:26:53 -0800
Subject: [PATCH] remove vformat from chrono.h

---
 include/fmt/chrono.h | 40 ++++++++++++++++++----------------------
 1 file changed, 18 insertions(+), 22 deletions(-)

diff --git a/include/fmt/chrono.h b/include/fmt/chrono.h
index d5c9d641..9574a7e0 100644
--- a/include/fmt/chrono.h
+++ b/include/fmt/chrono.h
@@ -768,24 +768,16 @@ inline std::chrono::duration<Rep, std::milli> get_milliseconds(
 template <typename Char, typename Rep, typename OutputIt,
           FMT_ENABLE_IF(std::is_integral<Rep>::value)>
 OutputIt format_duration_value(OutputIt out, Rep val, int) {
-  static FMT_CONSTEXPR_DECL const Char format[] = {'{', '}', 0};
-  return vformat_to(out, to_string_view(format),
-                    make_format_args<buffer_context<Char>>(val));
+  return write<Char>(out, val);
 }
 
 template <typename Char, typename Rep, typename OutputIt,
           FMT_ENABLE_IF(std::is_floating_point<Rep>::value)>
 OutputIt format_duration_value(OutputIt out, Rep val, int precision) {
-  static FMT_CONSTEXPR_DECL const Char pr_f[] = {'{', ':', '.', '{',
-                                                 '}', 'f', '}', 0};
-  if (precision >= 0) {
-    return vformat_to(out, to_string_view(pr_f),
-                      make_format_args<buffer_context<Char>>(val, precision));
-  }
-  static FMT_CONSTEXPR_DECL const Char fp_f[] = {'{', ':', 'g', '}', 0};
-
-  return vformat_to(out, to_string_view(fp_f),
-                    make_format_args<buffer_context<Char>>(val));
+  basic_format_specs<Char> specs;
+  specs.precision = precision;
+  specs.type = precision > 0 ? 'f' : 'g';
+  return write<Char>(out, val, specs);
 }
 
 template <typename Char, typename OutputIt>
@@ -805,16 +797,20 @@ template <typename Char, typename Period, typename OutputIt>
 OutputIt format_duration_unit(OutputIt out) {
   if (const char* unit = get_units<Period>())
     return copy_unit(string_view(unit), out, Char());
-  static FMT_CONSTEXPR_DECL const Char num_f[] = {'[', '{', '}', ']', 's', 0};
-  if (const_check(Period::den == 1)) {
-    return vformat_to(out, to_string_view(num_f),
-                      make_format_args<buffer_context<Char>>(Period::num));
+
+  basic_memory_buffer<Char> buffer;
+  auto bufOut = std::back_inserter(buffer);
+  *bufOut++ = '[';
+  bufOut = write<Char>(bufOut, Period::num);
+
+  if (const_check(Period::den != 1)) {
+    *bufOut++ = '/';
+    bufOut = write<Char>(bufOut, Period::den);
   }
-  static FMT_CONSTEXPR_DECL const Char num_def_f[] = {'[', '{', '}', '/', '{',
-                                                      '}', ']', 's', 0};
-  return vformat_to(
-      out, to_string_view(num_def_f),
-      make_format_args<buffer_context<Char>>(Period::num, Period::den));
+
+  *bufOut++ = ']';
+  *bufOut++ = 's';
+  return write<Char>(out, {buffer.data(), buffer.size()});
 }
 
 template <typename FormatContext, typename OutputIt, typename Rep,