From 0c5e5b8e584be1806a046385d447a13755bf6cb1 Mon Sep 17 00:00:00 2001
From: Gennaro Prota <gennaro.prota@gmail.com>
Date: Thu, 18 Dec 2025 16:44:07 +0100
Subject: [PATCH] Fix our deduction guide

---
 include/boost/static_string/static_string.hpp | 2 +-
 test/constexpr_tests.hpp                      | 1 +
 2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/boost/static_string/static_string.hpp b/include/boost/static_string/static_string.hpp
index 6b4d3d0..f82425a 100644
--- a/include/boost/static_string/static_string.hpp
+++ b/include/boost/static_string/static_string.hpp
@@ -6529,7 +6529,7 @@ to_static_wstring(long double value) noexcept
 #ifdef BOOST_STATIC_STRING_USE_DEDUCT
 template<std::size_t N, typename CharT>
 basic_static_string(const CharT(&)[N]) ->
-  basic_static_string<N, CharT, std::char_traits<CharT>>;
+  basic_static_string<N - 1, CharT, std::char_traits<CharT>>;
 #endif
 
 //------------------------------------------------------------------------------
diff --git a/test/constexpr_tests.hpp b/test/constexpr_tests.hpp
index 71ca3af..018741e 100644
--- a/test/constexpr_tests.hpp
+++ b/test/constexpr_tests.hpp
@@ -110,6 +110,7 @@ testConstantEvaluation()
   // Check construction in a constexpr context
   constexpr basic_static_string s("hello");
   static_assert(s.size() == 5);
+  static_assert(s.static_capacity == 5);
   static_assert(s == "hello");
 
   // Check assignment in a constexpr context