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util/NumberParser: add ParseIntegerTo()

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An version of the function without the `std::optional` overhead.
This commit is contained in:
Max Kellermann 2025-03-07 09:44:52 +01:00 committed by Max Kellermann
parent e9c1ea684b
commit 55c11448ff
1 changed files with 11 additions and 0 deletions

11
src/util/NumberParser.hxx

@ -18,6 +18,17 @@ FromChars(std::string_view s, std::integral auto &value, int base=10) noexcept
return std::from_chars(s.data(), s.data() + s.size(), value, base); return std::from_chars(s.data(), s.data() + s.size(), value, base);
} }
/**
* A wrapper for FromChars() which translates the #from_chars_result
* to a boolean (true on success, false on error).
*/
inline bool
ParseIntegerTo(std::string_view s, std::integral auto &value, int base=10) noexcept
{
auto [ptr, ec] = FromChars(s, value, base);
return ptr == s.data() + s.size() && ec == std::errc{};
}
template<std::integral T> template<std::integral T>
[[gnu::pure]] [[gnu::pure]]
std::optional<T> std::optional<T>