From e9c1ea684b1753590a2a0dcbf6d5d545868d74fd Mon Sep 17 00:00:00 2001
From: Max Kellermann <max.kellermann@ionos.com>
Date: Fri, 7 Mar 2025 09:11:42 +0100
Subject: [PATCH] util/NumberParser: add std::from_chars() wrapper taking
 std::string_view

---
 src/util/NumberParser.hxx | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/util/NumberParser.hxx b/src/util/NumberParser.hxx
index 101225eba..35cf9153a 100644
--- a/src/util/NumberParser.hxx
+++ b/src/util/NumberParser.hxx
@@ -8,6 +8,16 @@
 #include <optional>
 #include <string_view>
 
+/**
+ * A std::from_chars() wrapper taking a std::string_view.  How
+ * annoying that the C++ standard library doesn't allow this!
+ */
+inline std::from_chars_result
+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);
+}
+
 template<std::integral T>
 [[gnu::pure]]
 std::optional<T>