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suppress unused variable warnings #2381

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merged 3 commits into from
Jun 30, 2021
+7 −1
Merged

suppress unused variable warnings #2381

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2057701
suppress unused variable warnings
gsjaardema Jun 23, 2021
8dc4feb
Format to eliminate long lines
gsjaardema Jun 28, 2021
62dd44d
Run clang-format
gsjaardema Jun 29, 2021
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8 changes: 7 additions & 1 deletion include/fmt/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -332,6 +332,12 @@ struct monostate {
constexpr monostate() {}
};

// Eliminate "unused variable" warnings on all compilers. The
// `(void)var` method does not work on many intel compilers. This is
// from Herb Sutter, "Shutting up compiler warnings",
// https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/
template <class T> void ignore_unused(const T&) {}

// An enable_if helper to be used in template parameters which results in much
// shorter symbols: https://godbolt.org/z/sWw4vP. Extra parentheses are needed
// to workaround a bug in MSVC 2019 (see #1140 and #1186).
Expand Down Expand Up @@ -2731,7 +2737,7 @@ void check_format_string(S format_str) {
remove_cvref_t<Args>...>;
FMT_CONSTEXPR bool invalid_format =
(parse_format_string<true>(s, checker(s, {})), true);
(void)invalid_format;
ignore_unused(invalid_format);
}

template <typename Char>
Expand Down