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avoid MSC warning C4702: unreachable code (#4822)

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if FMT_CONSTEXPR is resolved to constexpr MSC warns about dead code
after 'return' instruction. Explicitly using 'else' in these cases
avoids the warning.
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torsten48 2026-07-03 19:39:09 +02:00 committed by GitHub
parent 77b6ff700b
commit b54093c658
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GPG Key ID: B5690EEEBB952194
1 changed files with 23 additions and 13 deletions
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22
include/fmt/base.h
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@ -1285,10 +1285,13 @@ constexpr auto to_ascii(Char c) -> char {
// Returns the number of code units in a code point or 1 on error.
template <typename Char>
FMT_CONSTEXPR auto code_point_length(const Char* begin) -> int {
if FMT_CONSTEXPR20 (sizeof(Char) != 1) return 1;
if FMT_CONSTEXPR20 (sizeof(Char) != 1) {
return 1;
} else {
auto c = static_cast<unsigned char>(*begin);
return static_cast<int>((0x3a55000000000000ull >> (2 * (c >> 3))) & 3) + 1;
}
}
// Parses the range [begin, end) as an unsigned integer. This function assumes
// that the range is non-empty and the first character is a digit.
@ -2896,11 +2899,13 @@ FMT_API void vprint_buffered(FILE* f, string_view fmt, format_args args);
template <typename... T>
FMT_INLINE void print(format_string<T...> fmt, T&&... args) {
vargs<T...> va = {{args...}};
if FMT_CONSTEXPR20 (!detail::use_utf8)
return detail::vprint_mojibake(stdout, fmt.str, va, false);
if FMT_CONSTEXPR20 (!detail::use_utf8) {
detail::vprint_mojibake(stdout, fmt.str, va, false);
} else {
detail::is_locking<T...>() ? vprint_buffered(stdout, fmt.str, va)
: vprint(fmt.str, va);
}
}
/**
* Formats `args` according to specifications in `fmt` and writes the
@ -2913,20 +2918,25 @@ FMT_INLINE void print(format_string<T...> fmt, T&&... args) {
template <typename... T>
FMT_INLINE void print(FILE* f, format_string<T...> fmt, T&&... args) {
vargs<T...> va = {{args...}};
if FMT_CONSTEXPR20 (!detail::use_utf8)
return detail::vprint_mojibake(f, fmt.str, va, false);
if FMT_CONSTEXPR20 (!detail::use_utf8) {
detail::vprint_mojibake(f, fmt.str, va, false);
} else {
detail::is_locking<T...>() ? vprint_buffered(f, fmt.str, va)
: vprint(f, fmt.str, va);
}
}
/// Formats `args` according to specifications in `fmt` and writes the output
/// to the file `f` followed by a newline.
template <typename... T>
FMT_INLINE void println(FILE* f, format_string<T...> fmt, T&&... args) {
vargs<T...> va = {{args...}};
if FMT_CONSTEXPR20 (detail::use_utf8) return vprintln(f, fmt.str, va);
if FMT_CONSTEXPR20 (detail::use_utf8) {
vprintln(f, fmt.str, va);
} else {
detail::vprint_mojibake(f, fmt.str, va, true);
}
}
/// Formats `args` according to specifications in `fmt` and writes the output
/// to `stdout` followed by a newline.