From 59c0fb69f05cd7175746dbeac98a47909ca03800 Mon Sep 17 00:00:00 2001
From: Ruben Perez <rubenperez038@gmail.com>
Date: Tue, 6 Feb 2024 20:08:04 +0100
Subject: [PATCH] Constructor from std::string_view is now constexpr

close #163
---
 include/boost/core/detail/string_view.hpp | 2 +-
 test/sv_construct_test.cpp                | 5 +++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/include/boost/core/detail/string_view.hpp b/include/boost/core/detail/string_view.hpp
index 1d89b8b..2236545 100644
--- a/include/boost/core/detail/string_view.hpp
+++ b/include/boost/core/detail/string_view.hpp
@@ -392,7 +392,7 @@ public:
 
 #if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
 
-    basic_string_view( std::basic_string_view<Ch, std::char_traits<Ch> > const& str ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
+    BOOST_CONSTEXPR basic_string_view( std::basic_string_view<Ch, std::char_traits<Ch> > const& str ) BOOST_NOEXCEPT: p_( str.data() ), n_( str.size() )
     {
     }
 
diff --git a/test/sv_construct_test.cpp b/test/sv_construct_test.cpp
index 3a33fbd..01dbd84 100644
--- a/test/sv_construct_test.cpp
+++ b/test/sv_construct_test.cpp
@@ -18,6 +18,11 @@ template<class It> std::reverse_iterator<It> make_reverse_iterator( It it )
     return std::reverse_iterator<It>( it );
 }
 
+// Verify that the constructor from std::string_view can be called in a constexpr context
+#if !defined(BOOST_NO_CXX17_HDR_STRING_VIEW)
+static_assert(!boost::core::string_view(std::string_view("abc", 3)).empty());
+#endif
+
 int main()
 {
     {