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Trying to clear ambiguous compile time claims (#1775)

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* Trying to clear ambiguous compile time claims

Documentation was a bit misleading.
Many people assume that fmt does compile time checks by default, while it requires the use of `FMT_STRING`.
It was also unclear that FMT_COMPILE does the same checks.

https://github.com/fmtlib/fmt/issues/1772

* Update api.rst
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Léonard Gérard 2020-07-16 06:19:49 -07:00 committed by GitHub
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@ -114,9 +114,9 @@ string checks, wide string, output iterator and user-defined type support.
Compile-time Format String Checks
---------------------------------
Compile-time checks are supported for built-in and string types as well as
user-defined types with ``constexpr`` ``parse`` functions in their ``formatter``
specializations.
Compile-time checks are enabled when using ``FMT_STRING``. They support built-in
and string types as well as user-defined types with ``constexpr`` ``parse``
functions in their ``formatter`` specializations.
.. doxygendefine:: FMT_STRING
@ -389,9 +389,10 @@ The format string syntax is described in the documentation of
Format string compilation
=========================
``fmt/compile.h`` provides format string compilation support. Format strings
are parsed at compile time and converted into efficient formatting code. This
supports arguments of built-in and string types as well as user-defined types
``fmt/compile.h`` provides format string compilation support when using
``FMT_COMPILE``. Format strings 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