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Clarify requirement on compiled formatter

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This commit is contained in:
Victor Zverovich 2023-07-20 10:24:02 -07:00
parent fb97cb2318
commit 95e1ea5737
1 changed files with 14 additions and 4 deletions
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doc/api.rst
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@ -549,10 +549,20 @@ Format String Compilation
``FMT_COMPILE`` macro or the ``_cf`` user-defined literal. Format strings
marked with ``FMT_COMPILE`` or ``_cf`` are parsed, checked and converted into
efficient formatting code at compile-time. This supports arguments of built-in
and string types as well as user-defined types with ``constexpr`` ``parse``
functions in their ``formatter`` specializations. Format string compilation can
generate more binary code compared to the default API and is only recommended in
places where formatting is a performance bottleneck.
and string types as well as user-defined types with ``format`` functions taking
the format context type as a template parameter in their ``formatter``
specializations. For example::
template <> struct fmt::formatter<point> {
constexpr auto parse(format_parse_context& ctx);
template <typename FormatContext>
auto format(const point& p, FormatContext& ctx) const;
};
Format string compilation can generate more binary code compared to the default
API and is only recommended in places where formatting is a performance
bottleneck.
.. doxygendefine:: FMT_COMPILE