Custom formatter example from the documentation fails to compile

[jeremy-rifkin]

The following code using a custom formatter example from the documentation fails to compile:

#include <fmt/format.h>

enum class color { red, green, blue };

template <>
struct fmt::formatter<color> : formatter<string_view> {
    // parse is inherited from formatter<string_view>.

    auto format(color c, format_context& ctx) const -> format_parse_context::iterator;
};

auto fmt::formatter<color>::format(color c, format_context& ctx) const -> format_parse_context::iterator {
    string_view name = "unknown";
    switch (c) {
        case color::red:
            name = "red";
            break;
        case color::green:
            name = "green";
            break;
        case color::blue:
            name = "blue";
            break;
    }
    return formatter<string_view>::format(name, ctx);
}

auto foo(color c) {
    return fmt::format("{}", c);
}

https://godbolt.org/z/ojKnYf4ad

[vitaut]

Good catch, thanks. Fixed in #3895.

[jeremy-rifkin]

Thanks for the lightning-fast fix!