unicode_to_utf8 -> to_utf8 since both sides of conversion are Unicode

include/fmt/chrono.h

@@ -377,8 +377,8 @@ auto write_encoded_tm_str(OutputIt out, string_view in, const std::locale& loc)
     unit_t unit;
     write_codecvt(unit, in, loc);
     // In UTF-8 is used one to four one-byte code units.
-    unicode_to_utf8<code_unit, basic_memory_buffer<char, unit_t::max_size * 4>>
-        u;
+    auto u =
+        to_utf8<code_unit, basic_memory_buffer<char, unit_t::max_size * 4>>();
     if (!u.convert({unit.buf, to_unsigned(unit.end - unit.buf)}))
       FMT_THROW(format_error("failed to format time"));
     return copy_str<char>(u.c_str(), u.c_str() + u.size(), out);

include/fmt/format.h

@@ -1420,13 +1420,13 @@ class utf8_to_utf16 {
 
 // A converter from UTF-16/UTF-32 (host endian) to UTF-8.
 template <typename WChar, typename Buffer = memory_buffer>
-class unicode_to_utf8 {
+class to_utf8 {
  private:
   Buffer buffer_;
 
  public:
-  unicode_to_utf8() {}
-  explicit unicode_to_utf8(basic_string_view<WChar> s) {
+  to_utf8() {}
+  explicit to_utf8(basic_string_view<WChar> s) {
     static_assert(sizeof(WChar) == 2 || sizeof(WChar) == 4,
                   "Expect utf16 or utf32");
 

include/fmt/std.h

@@ -61,7 +61,7 @@ inline void write_escaped_path<char>(memory_buffer& quoted,
   auto buf = basic_memory_buffer<wchar_t>();
   write_escaped_string<wchar_t>(std::back_inserter(buf), p.native());
   // Convert UTF-16 to UTF-8.
-  if (!unicode_to_utf8<wchar_t>::convert(quoted, {buf.data(), buf.size()}))
+  if (!to_utf8<wchar_t>::convert(quoted, {buf.data(), buf.size()}))
     FMT_THROW(std::runtime_error("invalid utf16"));
 }
 #  endif