Improve separation between code unit types

include/fmt/core.h

@@ -494,12 +494,10 @@ template <typename Char> class basic_string_view {
 };
 
 using string_view = basic_string_view<char>;
-using wstring_view = basic_string_view<wchar_t>;
 
 /** Specifies if ``T`` is a character type. Can be specialized by users. */
 template <typename T> struct is_char : std::false_type {};
 template <> struct is_char<char> : std::true_type {};
-template <> struct is_char<wchar_t> : std::true_type {};
 
 /**
   \rst
@@ -597,16 +595,7 @@ template <typename S> using char_t = typename detail::char_t_impl<S>::type;
   \rst
   Parsing context consisting of a format string range being parsed and an
   argument counter for automatic indexing.
-
-  You can use one of the following type aliases for common character types:
-
-  +-----------------------+-------------------------------------+
-  | Type                  | Definition                          |
-  +=======================+=====================================+
-  | format_parse_context  | basic_format_parse_context<char>    |
-  +-----------------------+-------------------------------------+
-  | wformat_parse_context | basic_format_parse_context<wchar_t> |
-  +-----------------------+-------------------------------------+
+  You can use the ```format_parse_context`` type alias for ``char`` instead.
   \endrst
  */
 template <typename Char, typename ErrorHandler = detail::error_handler>
@@ -673,7 +662,6 @@ class basic_format_parse_context : private ErrorHandler {
 };
 
 using format_parse_context = basic_format_parse_context<char>;
-using wformat_parse_context = basic_format_parse_context<wchar_t>;
 
 template <typename Context> class basic_format_arg;
 template <typename Context> class basic_format_args;
@@ -1565,7 +1553,6 @@ template <typename Char>
 using buffer_context =
     basic_format_context<detail::buffer_appender<Char>, Char>;
 using format_context = buffer_context<char>;
-using wformat_context = buffer_context<wchar_t>;
 
 // Workaround an alias issue: https://stackoverflow.com/q/62767544/471164.
 #define FMT_BUFFER_CONTEXT(Char) \
@@ -1777,10 +1764,9 @@ template <typename Context> class basic_format_args {
 };
 
 /** An alias to ``basic_format_args<format_context>``. */
-// Separate types would result in shorter symbols but break ABI compatibility
+// A separate type would result in shorter symbols but break ABI compatibility
 // between clang and gcc on ARM (#1919).
 using format_args = basic_format_args<format_context>;
-using wformat_args = basic_format_args<wformat_context>;
 
 // We cannot use enum classes as bit fields because of a gcc bug
 // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61414.

include/fmt/format.h

@@ -623,6 +623,9 @@ void iterator_buffer<OutputIt, T, Traits>::flush() {
 
 FMT_MODULE_EXPORT_BEGIN
 
+using wstring_view = basic_string_view<wchar_t>;
+
+template <> struct is_char<wchar_t> : std::true_type {};
 template <> struct is_char<detail::char8_type> : std::true_type {};
 template <> struct is_char<char16_t> : std::true_type {};
 template <> struct is_char<char32_t> : std::true_type {};
@@ -2888,4 +2891,8 @@ FMT_END_NAMESPACE
 #  define FMT_FUNC
 #endif
 
+#ifdef FMT_DEPRECATED_WCHAR
+#  include "wchar.h"
+#endif
+
 #endif  // FMT_FORMAT_H_

include/fmt/wchar.h

@@ -14,6 +14,10 @@
 
 FMT_BEGIN_NAMESPACE
 
+using wformat_parse_context = basic_format_parse_context<wchar_t>;
+using wformat_context = buffer_context<wchar_t>;
+using wformat_args = basic_format_args<wformat_context>;
+
 #if FMT_GCC_VERSION && FMT_GCC_VERSION < 409
 // Workaround broken conversion on older gcc.
 template <typename... Args> using wformat_string = wstring_view;

test/format-test.cc

@@ -2380,16 +2380,6 @@ TEST(format_test, vformat_to) {
   s.clear();
   fmt::vformat_to(std::back_inserter(s), FMT_STRING("{}"), args);
   EXPECT_EQ("42", s);
-
-  using wcontext = fmt::wformat_context;
-  fmt::basic_format_arg<wcontext> warg = fmt::detail::make_arg<wcontext>(42);
-  auto wargs = fmt::basic_format_args<wcontext>(&warg, 1);
-  auto w = std::wstring();
-  fmt::vformat_to(std::back_inserter(w), L"{}", wargs);
-  EXPECT_EQ(L"42", w);
-  w.clear();
-  fmt::vformat_to(std::back_inserter(w), FMT_STRING(L"{}"), wargs);
-  EXPECT_EQ(L"42", w);
 }
 
 template <typename T> static std::string fmt_to_string(const T& t) {

test/locale-test.cc

@@ -88,8 +88,10 @@ TEST(locale_test, wformat) {
   auto loc = std::locale(std::locale(), new numpunct<wchar_t>());
   EXPECT_EQ(L"1234567", fmt::format(std::locale(), L"{:L}", 1234567));
   EXPECT_EQ(L"1~234~567", fmt::format(loc, L"{:L}", 1234567));
-  fmt::format_arg_store<fmt::wformat_context, int> as{1234567};
-  EXPECT_EQ(L"1~234~567", fmt::vformat(loc, L"{:L}", fmt::wformat_args(as)));
+  using wcontext = fmt::buffer_context<wchar_t>;
+  fmt::format_arg_store<wcontext, int> as{1234567};
+  EXPECT_EQ(L"1~234~567",
+            fmt::vformat(loc, L"{:L}", fmt::basic_format_args<wcontext>(as)));
   EXPECT_EQ(L"1234567", fmt::format(std::locale("C"), L"{:L}", 1234567));
 
   auto no_grouping_loc = std::locale(std::locale(), new no_grouping<wchar_t>());

test/wchar-test.cc

@@ -9,6 +9,18 @@
 
 #include "gtest/gtest.h"
 
+TEST(format_test, vformat_to) {
+  using wcontext = fmt::wformat_context;
+  fmt::basic_format_arg<wcontext> warg = fmt::detail::make_arg<wcontext>(42);
+  auto wargs = fmt::basic_format_args<wcontext>(&warg, 1);
+  auto w = std::wstring();
+  fmt::vformat_to(std::back_inserter(w), L"{}", wargs);
+  EXPECT_EQ(L"42", w);
+  w.clear();
+  fmt::vformat_to(std::back_inserter(w), FMT_STRING(L"{}"), wargs);
+  EXPECT_EQ(L"42", w);
+}
+
 #if FMT_USE_USER_DEFINED_LITERALS
 TEST(format_test, format_udl) {
   using namespace fmt::literals;