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suppress unused variable warnings (#2381)

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* suppress unused variable warnings

An arguably better method for suppressing unused variable warnings.   The `(void)var` method does not work on many intel compiilers.
This is from Herb Sutter's blog post https://herbsutter.com/2009/10/18/mailbag-shutting-up-compiler-warnings/

* Format to eliminate long lines

* Run clang-format
This commit is contained in:
Greg Sjaardema
2021-06-30 07:33:30 -06:00
committed by GitHub
parent 002bb759ff
commit fbb70eec5c
1 changed files with 7 additions and 1 deletions
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8
include/fmt/core.h
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@ -333,6 +333,12 @@ 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).
@ -2739,7 +2745,7 @@ 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>