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🛠 Add basic array safety functions and backwards-compatible result type (#3805)

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This commit is contained in:
The Phantom Derpstorm
2024-01-16 07:01:15 -08:00
committed by GitHub
parent 64091b7a25
commit 13ec66bf78
2 changed files with 82 additions and 8 deletions
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include/fmt/base.h
+38 -6
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@@ -276,6 +276,8 @@
# define FMT_UNICODE !FMT_MSC_VERSION
#endif
#define FMT_FWD(...) static_cast<decltype(__VA_ARGS__)&&>(__VA_ARGS__)
// Enable minimal optimizations for more compact code in debug mode.
FMT_GCC_PRAGMA("GCC push_options")
#if !defined(__OPTIMIZE__) && !defined(__CUDACC__)
@@ -2861,8 +2863,10 @@ inline auto runtime(string_view s) -> runtime_format_string<> { return {{s}}; }
/** Formats a string and writes the output to ``out``. */
template <typename OutputIt,
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt {
FMT_ENABLE_IF(detail::is_output_iterator<remove_cvref_t<OutputIt>,
char>::value)>
auto vformat_to(OutputIt&& out, string_view fmt, format_args args)
-> remove_cvref_t<OutputIt> {
auto&& buf = detail::get_buffer<char>(out);
detail::vformat_to(buf, fmt, args, {});
return detail::get_iterator(buf, out);
@@ -2881,10 +2885,11 @@ auto vformat_to(OutputIt out, string_view fmt, format_args args) -> OutputIt {
\endrst
*/
template <typename OutputIt, typename... T,
FMT_ENABLE_IF(detail::is_output_iterator<OutputIt, char>::value)>
FMT_INLINE auto format_to(OutputIt out, format_string<T...> fmt, T&&... args)
-> OutputIt {
return vformat_to(out, fmt, fmt::make_format_args(args...));
FMT_ENABLE_IF(detail::is_output_iterator<remove_cvref_t<OutputIt>,
char>::value)>
FMT_INLINE auto format_to(OutputIt&& out, format_string<T...> fmt, T&&... args)
-> remove_cvref_t<OutputIt> {
return vformat_to(FMT_FWD(out), fmt, fmt::make_format_args(args...));
}
template <typename OutputIt> struct format_to_n_result {
@@ -2919,6 +2924,33 @@ FMT_INLINE auto format_to_n(OutputIt out, size_t n, format_string<T...> fmt,
return vformat_to_n(out, n, fmt, fmt::make_format_args(args...));
}
template <typename OutputIt, typename OutputSen = OutputIt>
struct format_to_result {
/** Iterator pointing to just after the last succesful write in the range. */
OutputIt out;
/** Sentinel indicating the end of the output range. */
OutputSen out_last;
FMT_CONSTEXPR operator OutputIt&() & noexcept { return out; }
FMT_CONSTEXPR operator const OutputIt&() const& noexcept { return out; }
FMT_CONSTEXPR operator OutputIt&&() && noexcept {
return static_cast<OutputIt&&>(out);
}
};
template <size_t Size>
auto vformat_to(char (&out)[Size], string_view fmt, format_args args)
-> format_to_result<char*> {
format_to_n_result<char*> result = vformat_to_n(out, Size, fmt, args);
return {result.out, out + Size};
}
template <size_t Size, typename... T>
FMT_INLINE auto format_to(char (&out)[Size], format_string<T...> fmt,
T&&... args) -> format_to_result<char*> {
return vformat_to(out, fmt, fmt::make_format_args(args...));
}
/** Returns the number of chars in the output of ``format(fmt, args...)``. */
template <typename... T>
FMT_NODISCARD FMT_INLINE auto formatted_size(format_string<T...> fmt,