From 3d7a431811748c5aa1f49c35436696fc3f05de5d Mon Sep 17 00:00:00 2001
From: Roland Reichwein <mail@reichwein.it>
Date: Fri, 5 Feb 2021 14:10:53 +0100
Subject: Documentation, support validation via Traits

---
 include/unicode.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

(limited to 'include/unicode.h')

diff --git a/include/unicode.h b/include/unicode.h
index df61ac3..2424fb1 100644
--- a/include/unicode.h
+++ b/include/unicode.h
@@ -562,6 +562,7 @@ namespace unicode {
   return result;
  }
 
+ // basic type version
  template<typename T>
  bool is_valid_utf(const std::basic_string<T>& s)
  {
@@ -573,5 +574,17 @@ namespace unicode {
   return true;
  }
 
+ // Facet version
+ template<typename Facet>
+ bool is_valid_utf(const std::basic_string<typename Facet::value_type>& s)
+ {
+  try {
+   std::for_each(Facet::begin(s), Facet::end(s), [](const char32_t& c){});
+  } catch (const std::invalid_argument&) {
+   return false;
+  }
+  return true;
+ }
+
 } // namespace unicode
 
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