v11.2.0

Compare Source

• Added the s specifier for std::error_code. It allows formatting an error
  message as a string. For example:

  #include <fmt/std.h>
  
  int main() {
    auto ec = std::make_error_code(std::errc::no_such_file_or_directory);
    fmt::print("{:s}\n", ec);
  }

  prints

  No such file or directory
  

  (The actual message is platform-specific.)

• Fixed formatting of std::chrono::local_time and tm
  (#​3815,
  #​4350).
  For example (godbolt):

  #include <fmt/chrono.h>
  
  int main() {
    std::chrono::zoned_time zt(
      std::chrono::current_zone(),
      std::chrono::system_clock::now());
    fmt::print("{}", zt.get_local_time());
  }

  is now formatted consistenly across platforms.

• Added diagnostics for cases when timezone information is not available.
  For example:

  fmt::print("{:Z}", std::chrono::local_seconds());

  now gives a compile-time error.

• Deprecated fmt::localtime in favor of std::localtime.

• Fixed compilation with GCC 15 and C++20 modules enabled
  (#​4347). Thanks @​tkhyn.

• Fixed handling of named arguments in format specs
  (#​4360,
  #​4361). Thanks @​dinomight.

• Added error reporting for duplicate named arguments
  (#​4282,
  #​4367). Thanks @​dinomight.

• Fixed formatting of long with FMT_BUILTIN_TYPES=0
  (#​4375,
  #​4394).

• Optimized text_style using bit packing
  (#​4363). Thanks @​localspook.

• Added support for incomplete types (#​3180,
  #​4383). Thanks @​localspook.

• Fixed a flush issue in fmt::print when using libstdc++
  (#​4398).

• Fixed fmt::println usage with FMT_ENFORCE_COMPILE_STRING and legacy
  compile-time checks (#​4407).
  Thanks @​madmaxoft.

• Removed legacy header fmt/core.h from docs
  (#​4421,
  #​4422). Thanks @​krzysztofkortas.

• Worked around limitations of __builtin_strlen during constant evaluation
  (#​4423,
  #​4429). Thanks @​BRevzin.

• Worked around a bug in MSVC v141 (#​4412,
  #​4413). Thanks @​hirohira9119.

• Removed the fmt_detail namespace
  (#​4324).

• Removed specializations of std::is_floating_point in tests
  (#​4417).

• Fixed a CMake error when setting CMAKE_MODULE_PATH in the pedantic mode
  (#​4426). Thanks @​rlalik.

• Updated the Bazel config (#​4400).
  Thanks @​Vertexwahn.

v11.1.4

Compare Source

• Fixed ABI compatibility with earlier 11.x versions on Windows
  (#​4359).

• Improved the logic of switching between fixed and exponential format for
  float (#​3649).

• Moved is_compiled_string to the public API
  (#​4335,
  #​4342). Thanks @​SwooshyCueb.

• Simplified implementation of operator""_cf
  (#​4349). Thanks @​localspook.

• Fixed __builtin_strlen detection (#​4329).
  Thanks @​localspook.

• Fixed handling of BMI paths with the Ninja generator
  (#​4344). Thanks @​tkhyn.

• Fixed gcc 8.3 compile errors (#​4331,
  #​4336). Thanks @​sergiud.

• Fixed a bogus MSVC warning (#​4356).
  Thanks @​dinomight.

v11.1.3

Compare Source

• Fixed compilation on GCC 9.4 (#​4313).

• Worked around an internal compiler error when using C++20 modules with GCC
  14.2 and earlier (#​4295).

• Worked around a bug in GCC 6 (#​4318).

• Fixed an issue caused by instantiating formatter<const T>
  (#​4303,
  #​4325). Thanks @​timsong-cpp.

• Fixed formatting into std::ostreambuf_iterator when using format string
  compilation (#​4309,
  #​4312). Thanks @​phprus.

• Restored a constraint on the map formatter so that it correctly reports as
  unformattable when the element is (#​4326).
  Thanks @​timsong-cpp.

• Reduced the size of format specs (#​4298).

• Readded args() to fmt::format_context
  (#​4307,
  #​4310). Thanks @​Erroneous1.

• Fixed a bogus MSVC warning (#​4314,
  #​4322). Thanks @​ZehMatt.

• Fixed a pedantic mode error in the CMake config
  (#​4327). Thanks @​rlalik.

v11.1.2

Compare Source

• Fixed ABI compatibility with earlier 11.x versions
  (#​4292).

• Added wchar_t support to the std::bitset formatter
  (#​4285,
  #​4286,
  #​4289,
  #​4290). Thanks @​phprus.

• Prefixed CMake components with fmt- to simplify usage of {fmt} via
  add_subdirectory (#​4283).

• Updated docs for meson (#​4291).
  Thanks @​trim21.

• Fixed a compilation error in chrono on nvcc
  (#​4297,
  #​4301). Thanks @​breyerml.

• Fixed various warnings
  (#​4288,
  #​4299). Thanks @​GamesTrap and @​edo9300.

v11.1.1

Compare Source

• Fixed ABI compatibility with earlier 11.x versions
  (#​4278).

• Defined CMake components (core and doc) to allow docs to be installed
  separately (#​4276).
  Thanks @​carlsmedstad.

v11.1.0

• Improved C++20 module support
  (#​4081,
  #​4083,
  #​4084,
  #​4152,
  #​4153,
  #​4169,
  #​4190,
  #​4234,
  #​4239).
  Thanks @​kamrann and @​Arghnews.

• Reduced debug (unoptimized) binary code size and the number of template
  instantiations when passing formatting arguments. For example, unoptimized
  binary code size for fmt::print("{}", 42) was reduced by ~40% on GCC and
  ~60% on clang (x86-64).

  GCC:

  • Before: 161 instructions of which 105 are in reusable functions
    (godbolt).
  • After: 116 instructions of which 60 are in reusable functions
    (godbolt).

  Clang:

  • Before: 310 instructions of which 251 are in reusable functions
    (godbolt).
  • After: 194 instructions of which 135 are in reusable functions
    (godbolt).

• Added an experimental fmt::writer API that can be used for writing to
  different destinations such as files or strings
  (#​2354).
  For example (godbolt):

  #include <fmt/os.h>
  
  void write_text(fmt::writer w) {
    w.print("The answer is {}.", 42);
  }
  
  int main() {
    // Write to FILE.
    write_text(stdout);
  
    // Write to fmt::ostream.
    auto f = fmt::output_file("myfile");
    write_text(f);
  
    // Write to std::string.
    auto sb = fmt::string_buffer();
    write_text(sb);
    std::string s = sb.str();
  }

• Added width and alignment support to the formatter of std::error_code.

• Made std::expected<void, E> formattable
  (#​4145,
  #​4148).
  For example (godbolt):

  fmt::print("{}", std::expected<void, int>());

  prints

  expected()
  

  Thanks @​phprus.

• Made fmt::is_formattable<void> SFINAE-friendly
  (#​4147).

• Added support for _BitInt formatting when using clang
  (#​4007,
  #​4072,
  #​4140,
  #​4173,
  #​4176).
  For example (godbolt):

  using int42 = _BitInt(42);
  fmt::print("{}", int42(100));

  Thanks @​Arghnews.

• Added the n specifier for tuples and pairs
  (#​4107). Thanks @​someonewithpc.

• Added support for tuple-like types to fmt::join
  (#​4226,
  #​4230). Thanks @​phprus.

• Made more types formattable at compile time
  (#​4127). Thanks @​AnthonyVH.

• Implemented a more efficient compile-time fmt::formatted_size
  (#​4102,
  #​4103). Thanks @​phprus.

• Fixed compile-time formatting of some string types
  (#​4065). Thanks @​torshepherd.

• Made compiled version of fmt::format_to work with
  std::back_insert_iterator<std::vector<char>>
  (#​4206,
  #​4211). Thanks @​phprus.

• Added a formatter for std::reference_wrapper
  (#​4163,
  #​4164). Thanks @​yfeldblum and @​phprus.

• Added experimental padding support (glibc strftime extension) to %m, %j
  and %Y (#​4161). Thanks @​KKhanhH.

• Made microseconds formatted as us instead of µs if the Unicode support is
  disabled (#​4088).

• Fixed an unreleased regression in transcoding of surrogate pairs
  (#​4094,
  #​4095). Thanks @​phprus.

• Made fmt::appender satisfy std::output_iterator concept
  (#​4092,
  #​4093). Thanks @​phprus.

• Made std::iterator_traits<fmt::appender> standard-conforming
  (#​4185). Thanks @​CaseyCarter.

• Made it easier to reuse fmt::formatter<std::string_view> for types with
  an implicit conversion to std::string_view
  (#​4036,
  #​4055). Thanks @​Arghnews.

• Made it possible to disable <filesystem> use via FMT_CPP_LIB_FILESYSTEM
  for compatibility with some video game console SDKs, e.g. Nintendo Switch SDK
  (#​4257,
  #​4258,
  #​4259). Thanks @​W4RH4WK and @​phprus.

• Fixed compatibility with platforms that use 80-bit long double
  (#​4245,
  #​4246). Thanks @​jsirpoma.

• Added support for UTF-32 code units greater than 0xFFFF in fill
  (#​4201).

• Fixed handling of legacy encodings on Windows with GCC
  (#​4162).

• Made fmt::to_string take fmt::basic_memory_buffer by const reference
  (#​4261,
  #​4262). Thanks @​sascha-devel.

• Added fmt::dynamic_format_arg_store::size
  (#​4270). Thanks @​hannes-harnisch.

• Removed the ability to control locale usage via an undocumented
  FMT_STATIC_THOUSANDS_SEPARATOR in favor of FMT_USE_LOCALE.

• Renamed FMT_EXCEPTIONS to FMT_USE_EXCEPTIONS for consistency with other
  similar macros.

• Improved include directory ordering to reduce the chance of including
  incorrect headers when using multiple versions of {fmt}
  (#​4116). Thanks @​cdzhan.

• Made it possible to compile a subset of {fmt} without the C++ runtime.

• Improved documentation and README
  (#​4066,
  #​4117,
  #​4203,
  #​4235). Thanks @​zyctree and @​nikola-sh.

• Improved the documentation generator (#​4110,
  #​4115). Thanks @​rturrado.

• Improved CI (#​4155,
  #​4151). Thanks @​phprus.

• Fixed various warnings and compilation issues
  (#​2708,
  #​4091,
  #​4109,
  #​4113,
  #​4125,
  #​4129,
  #​4130,
  #​4131,
  #​4132,
  #​4133,
  #​4144,
  #​4150,
  #​4158,
  #​4159,
  #​4160,
  #​4170,
  #​4177,
  #​4187,
  #​4188,
  #​4194,
  #​4200,
  #​4205,
  #​4207,
  #​4208,
  #​4210,
  #​4220,
  #​4231,
  #​4232,
  #​4233,
  #​4236,
  #​4267,
  #​4271).
  Thanks @​torsten48, @​Arghnews, @​tinfoilboy, @​aminya, @​Ottani, @​zeroomega,
  @​c4v4, @​kongy, @​vinayyadav3016, @​sergio-nsk, @​phprus and @​YexuanXiao.