372a4d1b79
since we do not rely on FMT_DEPRECATED_OSTREAM to define the
fmt::formatter for us anymore, let's stop defining `FMT_DEPRECATED_OSTREAM`.
in this change,
* utils: drop the range formatters in to_string.hh and to_string.c, as
we don't use them anymore. and the tests for them in
test/boost/string_format_test.cc are removed accordingly.
* utils: use fmt to print chunk_vector and small_vector. as
we are not able to print the elements using operator<< anymore
after switching to {fmt} formatters.
* test/boost: specialize fmt::details::is_std_string_like<bytes>
due to a bug in {fmt} v9, {fmt} fails to format a range whose
element type is `basic_sstring<uint8_t>`, as it considers it
as a string-like type, but `basic_sstring<uint8_t>`'s char type
is signed char, not char. this issue does not exist in {fmt} v10,
so, in this change, we add a workaround to explicitly specialize
the type trait to assure that {fmt} format this type using its
`fmt::formatter` specialization instead of trying to format it
as a string. also, {fmt}'s generic ranges formatter calls the
pair formatter's `set_brackets()` and `set_separator()` methods
when printing the range, but operator<< based formatter does not
provide these method, we have to include this change in the change
switching to {fmt}, otherwise the change specializing
`fmt::details::is_std_string_like<bytes>` won't compile.
* test/boost: in tests, we use `BOOST_REQUIRE_EQUAL()` and its friends
for comparing values. but without the operator<< based formatters,
Boost.Test would not be able to print them. after removing
the homebrew formatters, we need to use the generic
`boost_test_print_type()` helper to do this job. so we are
including `test_utils.hh` in tests so that we can print
the formattable types.
* treewide: add "#include "utils/to_string.hh" where
`fmt::formatter<optional<>>` is used.
* configure.py: do not define FMT_DEPRECATED_OSTREAM
* cmake: do not define FMT_DEPRECATED_OSTREAM
Refs #13245
Signed-off-by: Kefu Chai <kefu.chai@scylladb.com>
42 lines
1.1 KiB
C++
42 lines
1.1 KiB
C++
/*
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* Copyright (C) 2015-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 <optional>
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#include <fmt/format.h>
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#include <fmt/ostream.h>
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#if FMT_VERSION < 100000
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template <typename T>
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struct fmt::formatter<std::optional<T>> : fmt::formatter<string_view> {
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template <typename FormatContext>
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auto format(const std::optional<T>& opt, FormatContext& ctx) const {
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if (opt) {
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return fmt::format_to(ctx.out(), "{}", *opt);
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} else {
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return fmt::format_to(ctx.out(), "{{}}");
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}
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}
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};
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#endif
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template <> struct fmt::formatter<std::strong_ordering> : fmt::formatter<string_view> {
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auto format(std::strong_ordering, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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template <> struct fmt::formatter<std::weak_ordering> : fmt::formatter<string_view> {
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auto format(std::weak_ordering, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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template <> struct fmt::formatter<std::partial_ordering> : fmt::formatter<string_view> {
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auto format(std::partial_ordering, fmt::format_context& ctx) const -> decltype(ctx.out());
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};
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