From da0059fb217195fbb3c6734b9cb06b37449b36b6 Mon Sep 17 00:00:00 2001
From: Connor McLaughlin <stenzek@gmail.com>
Date: Fri, 28 Feb 2020 17:00:05 +1000
Subject: [PATCH] Common/StringUtil: Add a FromChars std::optional wrapper

---
 src/common/string_util.h | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/src/common/string_util.h b/src/common/string_util.h
index a0100173e..fb6ff676c 100644
--- a/src/common/string_util.h
+++ b/src/common/string_util.h
@@ -1,7 +1,9 @@
 #pragma once
-#include <cstddef>
+#include <charconv>
 #include <cstdarg>
+#include <cstddef>
 #include <cstring>
+#include <optional>
 #include <string>
 
 namespace StringUtil {
@@ -26,4 +28,16 @@ inline int Strcasecmp(const char* s1, const char* s2)
 #endif
 }
 
+/// Wrapper arond std::from_chars
+template<typename T>
+std::optional<T> FromChars(const std::string_view str)
+{
+  T value;
+  const std::from_chars_result result = std::from_chars(str.data(), str.data() + str.length(), value);
+  if (result.ec != std::errc())
+    return std::nullopt;
+
+  return value;
+}
+
 } // namespace StringUtil
\ No newline at end of file