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Make FALLBACK_STRINGIFIER documentation more explicit

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Related to #1024
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Martin Hořeňovský 2018-05-14 21:03:07 +02:00
parent 4c7b7d04fe
commit df0b0e64e1
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docs/configuration.md
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@ -77,13 +77,16 @@ This can be useful on certain platforms that do not provide the standard iostrea
## Fallback stringifier
By default Catch's stringification machinery falls back to a "{?}". To
let projects reuse their own existing stringification machinery, this
fallback can be overridden by defining `CATCH_CONFIG_FALLBACK_STRINGIFIER`
to a name of a function that should perform the stringification instead.
By default, when Catch's stringification machinery has to stringify
a type that does not specialize `StringMaker`, does not overload `operator<<`,
is not an enumeration and is not a range, it uses `"{?}"`. This can be
overriden by defining `CATCH_CONFIG_FALLBACK_STRINGIFIER` to name of a
function that should perform the stringification instead.
The provided function must return std::string and must accept any type
(e.g. via overloading).
All types that do not provide `StringMaker` specialization or `operator<<`
overload will be sent to this function (this includes enums and ranges).
The provided function must return `std::string` and must accept any type,
e.g. via overloading.
_Note that if the provided function does not handle a type and this type
requires to be stringified, the compilation will fail._