Improve debug codegen

include/fmt/base.h

@@ -465,15 +465,14 @@ struct is_std_string_like<T, void_t<decltype(std::declval<T>().find_first_of(
 
 // Returns true iff the literal encoding is UTF-8.
 constexpr auto is_utf8_enabled() -> bool { return "\u00A7"[1] == '\xA7'; }
-constexpr auto use_utf8() -> bool {
+// It is a macro for better debug codegen without if constexpr.
-  return !FMT_MSC_VERSION || is_utf8_enabled();
+#define FMT_USE_UTF8 (!FMT_MSC_VERSION || fmt::detail::is_utf8_enabled())
-}
 
 #ifndef FMT_UNICODE
 #  define FMT_UNICODE 1
 #endif
 
-static_assert(!FMT_UNICODE || use_utf8(),
+static_assert(!FMT_UNICODE || FMT_USE_UTF8,
               "Unicode support requires compiling with /utf-8");
 
 template <typename Char> FMT_CONSTEXPR auto length(const Char* s) -> size_t {
@@ -3061,7 +3060,7 @@ FMT_API void vprintln(FILE* f, string_view fmt, format_args args);
 template <typename... T>
 FMT_INLINE void print(format_string<T...> fmt, T&&... args) {
   const auto& vargs = fmt::make_format_args(args...);
-  if (!detail::use_utf8()) return detail::vprint_mojibake(stdout, fmt, vargs);
+  if (!FMT_USE_UTF8) return detail::vprint_mojibake(stdout, fmt, vargs);
   return detail::is_locking<T...>() ? vprint_buffered(stdout, fmt, vargs)
                                     : vprint(fmt, vargs);
 }
@@ -3077,7 +3076,7 @@ FMT_INLINE void print(format_string<T...> fmt, T&&... args) {
 template <typename... T>
 FMT_INLINE void print(FILE* f, format_string<T...> fmt, T&&... args) {
   const auto& vargs = fmt::make_format_args(args...);
-  if (!detail::use_utf8()) return detail::vprint_mojibake(f, fmt, vargs);
+  if (!FMT_USE_UTF8) return detail::vprint_mojibake(f, fmt, vargs);
   return detail::is_locking<T...>() ? vprint_buffered(f, fmt, vargs)
                                     : vprint(f, fmt, vargs);
 }
@@ -3087,8 +3086,8 @@ FMT_INLINE void print(FILE* f, format_string<T...> fmt, T&&... args) {
 template <typename... T>
 FMT_INLINE void println(FILE* f, format_string<T...> fmt, T&&... args) {
   const auto& vargs = fmt::make_format_args(args...);
-  return detail::use_utf8() ? vprintln(f, fmt, vargs)
+  return FMT_USE_UTF8 ? vprintln(f, fmt, vargs)
-                            : detail::vprint_mojibake(f, fmt, vargs, true);
+                      : detail::vprint_mojibake(f, fmt, vargs, true);
 }
 
 /// Formats `args` according to specifications in `fmt` and writes the output

include/fmt/chrono.h

@@ -357,7 +357,7 @@ void write_codecvt(codecvt_result<CodeUnit>& out, string_view in_buf,
 template <typename OutputIt>
 auto write_encoded_tm_str(OutputIt out, string_view in, const std::locale& loc)
     -> OutputIt {
-  if (detail::use_utf8() && loc != get_classic_locale()) {
+  if (FMT_USE_UTF8 && loc != get_classic_locale()) {
     // char16_t and char32_t codecvts are broken in MSVC (linkage errors) and
     // gcc-4.
 #if FMT_MSC_VERSION != 0 ||  \
@@ -651,7 +651,8 @@ FMT_CONSTEXPR inline auto get_units() -> const char* {
   if (std::is_same<Period, std::femto>::value) return "fs";
   if (std::is_same<Period, std::pico>::value) return "ps";
   if (std::is_same<Period, std::nano>::value) return "ns";
-  if (std::is_same<Period, std::micro>::value) return use_utf8() ? "µs" : "us";
+  if (std::is_same<Period, std::micro>::value)
+    return FMT_USE_UTF8 ? "µs" : "us";
   if (std::is_same<Period, std::milli>::value) return "ms";
   if (std::is_same<Period, std::centi>::value) return "cs";
   if (std::is_same<Period, std::deci>::value) return "ds";

include/fmt/format.h

@@ -1860,7 +1860,7 @@ auto find_escape(const Char* begin, const Char* end)
 
 inline auto find_escape(const char* begin, const char* end)
     -> find_escape_result<char> {
-  if (!use_utf8()) return find_escape<char>(begin, end);
+  if (!FMT_USE_UTF8) return find_escape<char>(begin, end);
   auto result = find_escape_result<char>{end, nullptr, 0};
   for_each_codepoint(string_view(begin, to_unsigned(end - begin)),
                      [&](uint32_t cp, string_view sv) {

include/fmt/ostream.h

@@ -179,7 +179,7 @@ void vprint(std::basic_ostream<Char>& os,
 FMT_EXPORT template <typename... T>
 void print(std::ostream& os, format_string<T...> fmt, T&&... args) {
   const auto& vargs = fmt::make_format_args(args...);
-  if (detail::use_utf8())
+  if (FMT_USE_UTF8)
     vprint(os, fmt, vargs);
   else
     detail::vprint_directly(os, fmt, vargs);

test/ranges-test.cc

@@ -560,7 +560,7 @@ TEST(ranges_test, escape) {
   EXPECT_EQ(fmt::format("{}", vec{"\x7f"}), "[\"\\x7f\"]");
   EXPECT_EQ(fmt::format("{}", vec{"n\xcc\x83"}), "[\"n\xcc\x83\"]");
 
-  if (fmt::detail::use_utf8()) {
+  if (FMT_USE_UTF8) {
     EXPECT_EQ(fmt::format("{}", vec{"\xcd\xb8"}), "[\"\\u0378\"]");
     // Unassigned Unicode code points.
     EXPECT_EQ(fmt::format("{}", vec{"\xf0\xaa\x9b\x9e"}), "[\"\\U0002a6de\"]");

test/unicode-test.cc

@@ -15,7 +15,7 @@
 
 using testing::Contains;
 
-TEST(unicode_test, use_utf8) { EXPECT_TRUE(fmt::detail::use_utf8()); }
+TEST(unicode_test, use_utf8) { EXPECT_TRUE(FMT_USE_UTF8); }
 
 TEST(unicode_test, legacy_locale) {
   auto loc = get_locale("be_BY.CP1251", "Belarusian_Belarus.1251");