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Use inheritance for formatter

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This commit is contained in:
Shawn Zhong 2023-02-07 03:08:08 -06:00
parent a7d70b5dfd
commit ef3ffef853
1 changed files with 4 additions and 13 deletions
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17
include/fmt/ranges.h
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@ -675,25 +675,16 @@ template <typename T> class is_container_adaptor_like {
template <typename T, typename Char>
struct formatter<T, Char,
enable_if_t<detail::is_container_adaptor_like<T>::value>> {
private:
struct formatter<typename T::container_type, Char> container_formatter;
public:
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
return container_formatter.parse(ctx);
}
enable_if_t<detail::is_container_adaptor_like<T>::value>>
: formatter<typename T::container_type, Char> {
template <typename FormatContext>
auto format(T& t, FormatContext& ctx) const ->
typename FormatContext::iterator {
auto format(T& t, FormatContext& ctx) const -> decltype(ctx.out()) {
struct getter : T {
static auto get(T& t) -> typename T::container_type& {
return t.*(&getter::c); // Access c through the derived class.
}
};
return container_formatter.format(getter::get(t), ctx);
return formatter<typename T::container_type>::format(getter::get(t), ctx);
}
};