168ade72f8
in in {fmt} before v10, it provides the specialization of `fmt::formatter<..>`
for `std::string_view` as well as the specialization of `fmt::formatter<..>`
for `fmt::string_view` which is an implementation builtin in {fmt} for
compatibility of pre-C++17. and this type is used even if the code is
compiled with C++ stadandard greater or equal to C++17. also, before v10,
the `fmt::formatter<std::string_view>::format()` is defined so it accepts
`std::string_view`. after v10, `fmt::formatter<std::string_view>` still
exists, but it is now defined using `format_as()` machinery, so it's
`format()` method does not actually accept `std::string_view`, it
accepts `fmt::string_view`, as the former can be converted to
`fmt::string_view`.
this is why we can inherit from `fmt::formatter<std::string_view>` and
use `formatter<std::string_view>::format(foo, ctx);` to implement the
`format()` method with {fmt} v9, but we cannot do this with {fmt} v10,
and we would have following compilation failure:
```
FAILED: service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o
/home/kefu/.local/bin/clang++ -DFMT_DEPRECATED_OSTREAM -DFMT_SHARED -DSCYLLA_BUILD_MODE=release -DSEASTAR_API_LEVEL=7 -DSEASTAR_LOGGER_COMPILE_TIME_FMT -DSEASTAR_LOGGER_TYPE_STDOUT -DSEASTAR_SCHEDULING_GROUPS_COUNT=16 -DSEASTAR_SSTRING -DXXH_PRIVATE_API -DCMAKE_INTDIR=\"RelWithDebInfo\" -I/home/kefu/dev/scylladb -I/home/kefu/dev/scylladb/build/gen -I/home/kefu/dev/scylladb/seastar/include -I/home/kefu/dev/scylladb/build/seastar/gen/include -I/home/kefu/dev/scylladb/build/seastar/gen/src -ffunction-sections -fdata-sections -O3 -g -gz -std=gnu++20 -fvisibility=hidden -Wall -Werror -Wextra -Wno-error=deprecated-declarations -Wimplicit-fallthrough -Wno-c++11-narrowing -Wno-deprecated-copy -Wno-mismatched-tags -Wno-missing-field-initializers -Wno-overloaded-virtual -Wno-unsupported-friend -Wno-enum-constexpr-conversion -Wno-unused-parameter -ffile-prefix-map=/home/kefu/dev/scylladb=. -march=westmere -mllvm -inline-threshold=2500 -fno-slp-vectorize -U_FORTIFY_SOURCE -Werror=unused-result -MD -MT service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o -MF service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o.d -o service/CMakeFiles/service.dir/RelWithDebInfo/topology_state_machine.cc.o -c /home/kefu/dev/scylladb/service/topology_state_machine.cc
/home/kefu/dev/scylladb/service/topology_state_machine.cc:254:41: error: no matching member function for call to 'format'
254 | return formatter<std::string_view>::format(it->second, ctx);
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
/usr/include/fmt/core.h:2759:22: note: candidate function template not viable: no known conversion from 'seastar::basic_sstring<char, unsigned int, 15>' to 'const fmt::basic_string_view<char>' for 1st argument
2759 | FMT_CONSTEXPR auto format(const T& val, FormatContext& ctx) const
| ^ ~~~~~~~~~~~~
```
because the inherited `format()` method actually comes from
`fmt::formatter<fmt::string_view>`. to reduce the confusion, in this
change, we just inherit from `fmt::format<string_view>`, where
`string_view` is actually `fmt::string_view`. this follows
the document at
https://fmt.dev/latest/api.html#formatting-user-defined-types,
and since there is less indirection under the hood -- we do not
use the specialization created by `FMT_FORMAT_AS` which inherit
from `formatter<fmt::string_view>`, hopefully this can improve
the compilation speed a little bit. also, this change addresses
the build failure with {fmt} v10.
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
Closes scylladb/scylladb#18299
76 lines
2.0 KiB
C++
76 lines
2.0 KiB
C++
/*
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* Copyright (C) 2019-present ScyllaDB
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*/
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/*
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* SPDX-License-Identifier: AGPL-3.0-or-later
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*/
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#pragma once
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#include <map>
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#include <optional>
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#include <seastar/core/sstring.hh>
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#include "seastarx.hh"
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namespace cdc {
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enum class delta_mode : uint8_t {
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keys,
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full,
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};
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/**
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* (for now only pre-) image collection mode.
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* Stating how much info to record.
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* off == none
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* on == changed columns
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* full == all (changed and unmodified columns)
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*/
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enum class image_mode : uint8_t {
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off,
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on,
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full,
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};
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class options final {
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std::optional<bool> _enabled;
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image_mode _preimage = image_mode::off;
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bool _postimage = false;
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delta_mode _delta_mode = delta_mode::full;
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int _ttl = 86400; // 24h in seconds
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public:
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options() = default;
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options(const std::map<sstring, sstring>& map);
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std::map<sstring, sstring> to_map() const;
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sstring to_sstring() const;
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bool enabled() const { return _enabled.value_or(false); }
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bool is_enabled_set() const { return _enabled.has_value(); }
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bool preimage() const { return _preimage != image_mode::off; }
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bool full_preimage() const { return _preimage == image_mode::full; }
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bool postimage() const { return _postimage; }
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delta_mode get_delta_mode() const { return _delta_mode; }
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void set_delta_mode(delta_mode m) { _delta_mode = m; }
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int ttl() const { return _ttl; }
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void enabled(bool b) { _enabled = b; }
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void preimage(bool b) { preimage(b ? image_mode::on : image_mode::off); }
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void preimage(image_mode m) { _preimage = m; }
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void postimage(bool b) { _postimage = b; }
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void ttl(int v) { _ttl = v; }
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bool operator==(const options& o) const;
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};
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} // namespace cdc
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template <> struct fmt::formatter<cdc::image_mode> : fmt::formatter<string_view> {
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auto format(cdc::image_mode, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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template <> struct fmt::formatter<cdc::delta_mode> : fmt::formatter<string_view> {
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auto format(cdc::delta_mode, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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