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add support for fallback_formatter in detail::write

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Alexey Ochapov 2020-08-18 19:57:31 +03:00
parent 951e0d2333
commit 9d5ad7e0cd
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GPG Key ID: 740E711C3D542558
1 changed files with 14 additions and 1 deletions
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15
include/fmt/format.h
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@ -1841,7 +1841,9 @@ OutputIt write(OutputIt out, const void* value) {
return write_ptr<Char>(out, to_uintptr(value), nullptr);
}
template <typename Char, typename OutputIt, typename T>
template <typename Char, typename OutputIt, typename T,
FMT_ENABLE_IF(
has_formatter<T, basic_format_context<OutputIt, Char>>::value)>
auto write(OutputIt out, const T& value) -> typename std::enable_if<
mapped_type_constant<T, basic_format_context<OutputIt, Char>>::value ==
type::custom_type,
@ -1850,6 +1852,17 @@ auto write(OutputIt out, const T& value) -> typename std::enable_if<
return formatter<T>().format(value, ctx);
}
template <typename Char, typename OutputIt, typename T,
FMT_ENABLE_IF(has_fallback_formatter<
T, basic_format_context<OutputIt, Char>>::value)>
auto write(OutputIt out, const T& value) -> typename std::enable_if<
mapped_type_constant<T, basic_format_context<OutputIt, Char>>::value ==
type::custom_type,
OutputIt>::type {
basic_format_context<OutputIt, Char> ctx(out, {}, {});
return fallback_formatter<T>().format(value, ctx);
}
// An argument visitor that formats the argument and writes it via the output
// iterator. It's a class and not a generic lambda for compatibility with C++11.
template <typename OutputIt, typename Char> struct default_arg_formatter {