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Victor Zverovich 2020-10-25 08:56:46 -07:00
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ChangeLog.rst
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@ -1,15 +1,17 @@
7.1.0 - TBD
-----------
* Switched from Grisu3 to `Dragonbox <https://github.com/jk-jeon/dragonbox>`_
for the default floating-point formatting which gives the shortest decimal
representation with round-trip and correct rounding guarantees
* Switched from `Grisu3
<https://www.cs.tufts.edu/~nr/cs257/archive/florian-loitsch/printf.pdf>`_
to `Dragonbox <https://github.com/jk-jeon/dragonbox>`_ for the default
floating-point formatting which gives the shortest decimal representation
with round-trip guarantee and correct rounding
(`#1882 <https://github.com/fmtlib/fmt/pull/1882>`_,
`#1887 <https://github.com/fmtlib/fmt/pull/1887>`_,
`#1894 <https://github.com/fmtlib/fmt/pull/1894>`_). This makes {fmt} up to
20-30x faster than common implementations of ``std::ostringstream`` and
``sprintf`` on `dtoa-benchmark <https://github.com/fmtlib/dtoa-benchmark>`_
and faster than double-conversion and ryu:
and faster than double-conversion and Ryū:
.. image:: https://user-images.githubusercontent.com/576385/
95684665-11719600-0ba8-11eb-8e5b-972ff4e49428.png
@ -20,8 +22,9 @@
Thanks `@jk-jeon (Junekey Jeon) <https://github.com/jk-jeon>`_.
* Added an experimental unsynchronized file output API which, together with
the format string compilation, can give `5-9 times speed up compared to
fprintf <https://www.zverovich.net/2020/08/04/optimal-file-buffer-size.html>`_
`format string compilation <https://fmt.dev/latest/api.html#compile-api>`_,
can give `5-9 times speed up compared to fprintf
<https://www.zverovich.net/2020/08/04/optimal-file-buffer-size.html>`_
on common platforms (`godbolt <https://godbolt.org/z/nsTcG8>`__):
.. code:: c++
@ -127,12 +130,12 @@
fmt/core.h:1438:3: error: static_assert failed due to requirement
'fmt::v7::formattable<how_about_no>()' "Cannot format an argument.
To make type T formattable provide a formatter<T> specialization:
https://fmt.dev/dev/api.html#udt"
https://fmt.dev/latest/api.html#udt"
...
* Added the `make_args_checked <https://fmt.dev/7.1.0/api.html#argument-lists>`_
function template that allows you to write formatting functions with
compile-time format string checks
compile-time format string checks and avoid binary code bloat
(`godbolt <https://godbolt.org/z/PEf9qr>`__):
.. code:: c++
@ -166,34 +169,36 @@
fmt::print("{:.500}\n", 4.9406564584124654E-324);
}
prints ``4.9406564584124654417656879286822137236505980261432476442558568250067550727020875186529983636163599237979656469544571773092665671035593979639877479601078187812630071319031140452784581716784898210368871863605699873072305000638740915356498438731247339727316961514003171538539807412623856559117102665855668676818703956031062493194527159149245532930545654440112748012970999954193198940908041656332452475714786901472678015935523861155013480352649347201937902681071074917033322268447533357208324319360923829e-324``.
prints
``4.9406564584124654417656879286822137236505980261432476442558568250067550727020875186529983636163599237979656469544571773092665671035593979639877479601078187812630071319031140452784581716784898210368871863605699873072305000638740915356498438731247339727316961514003171538539807412623856559117102665855668676818703956031062493194527159149245532930545654440112748012970999954193198940908041656332452475714786901472678015935523861155013480352649347201937902681071074917033322268447533357208324319360923829e-324``.
* Made ``format_to_n`` and ``formatted_size`` part of the `core API
<https://fmt.dev/latest/api.html#core-api>`__
(`godbolt <https://godbolt.org/z/33Pzo3>`__):
(`godbolt <https://godbolt.org/z/sPjY1K>`__):
.. code:: c++
#include <fmt/core.h>
int main() {
char buf[10];
auto end = fmt::format_to_n(buf, sizeof(buf), "{}", 42);
char buffer[10];
auto result = fmt::format_to_n(buffer, sizeof(buffer), "{}", 42);
}
* Added ``fmt::format_to_n`` overload with format string compilation
(`#1764 <https://github.com/fmtlib/fmt/issues/1764>`_,
`#1767 <https://github.com/fmtlib/fmt/pull/1767>`_,
`#1869 <https://github.com/fmtlib/fmt/pull/1869>`_). For example
(`godbolt <https://godbolt.org/z/xesWh7>`__):
(`godbolt <https://godbolt.org/z/93h86q>`__):
.. code:: c++
#include <fmt/compile.h>
int main() {
char buf[8];
fmt::format_to_n(buf, sizeof(buf), FMT_COMPILE("{}"), 42);
char buffer[8];
fmt::format_to_n(buffer, sizeof(buffer), FMT_COMPILE("{}"), 42);
}
Thanks `@Kurkin (Dmitry Kurkin) <https://github.com/Kurkin>`_,
@ -218,7 +223,7 @@
Thanks `@Naios (Denis Blank) <https://github.com/Naios>`_.
* Made `#` emit trailing zeros
* Made the `#` specifier emit trailing zeros in addition to the decimal point
(`#1797 <https://github.com/fmtlib/fmt/issues/1797>`_). For example
(`godbolt <https://godbolt.org/z/bhdcW9>`__):
@ -241,7 +246,7 @@
* Fixed an issue with floating-point formatting that could result in addition of
a non-significant trailing zero in rare cases e.g. ``1.00e-34`` instead of
``1.0e-34`` (`#1873 <https://github.com/fmtlib/fmt/issues/1873>`_,
`#1917 <https://github.com/fmtlib/fmt/issues/1917>`_).
`#1917 <https://github.com/fmtlib/fmt/issues/1917>`_).
* Made ``fmt::to_string`` fallback on ``ostream`` insertion operator if
the ``formatter`` specialization is not provided
@ -256,7 +261,7 @@
Thanks `@t-wiser <https://github.com/t-wiser>`_.
* Fixed handling of types that have both an implicit conversion operator and
an overloaded `ostream` insertion operator
an overloaded ``ostream`` insertion operator
(`#1766 <https://github.com/fmtlib/fmt/issues/1766>`_).
* Fixed a slicing issue in an internal iterator type
@ -288,7 +293,8 @@
`#1792 <https://github.com/fmtlib/fmt/pull/1792>`_,
`#1838 <https://github.com/fmtlib/fmt/pull/1838>`_,
`#1888 <https://github.com/fmtlib/fmt/pull/1888>`_,
`#1918 <https://github.com/fmtlib/fmt/pull/1918>`_).
`#1918 <https://github.com/fmtlib/fmt/pull/1918>`_,
`#1939 <https://github.com/fmtlib/fmt/pull/1939>`_).
Thanks `@leolchat (Léonard Gérard) <https://github.com/leolchat>`_,
`@pepsiman (Malcolm Parsons) <https://github.com/pepsiman>`_,
`@Klaim (Joël Lamotte) <https://github.com/Klaim>`_,