add sstring string_view constructor

code/qcommon/sstring.h

@@ -30,6 +30,8 @@ along with this program; if not, see <http://www.gnu.org/licenses/>.
 #define SSTRING_H
 
 #include "../qcommon/q_shared.h"
+#include "qcommon/safe/gsl.h"
+#include <algorithm>
 
 template<int MaxSize>
 class sstring
@@ -59,6 +61,15 @@ class sstring
 		//strcpy(mStorage.data,s);
 		Q_strncpyz(mStorage.data,s,sizeof(mStorage.data),qtrue);
 	}
+	sstring( const gsl::cstring_view& v )
+	{
+		if( v.size() + 1 > sizeof( mStorage.data ) )
+		{
+			Com_Error( ERR_FATAL, "String dest buffer too small (%d) to hold string of length %d", sizeof( mStorage.data ), v.size() );
+		}
+		std::copy( v.begin(), v.end(), mStorage.data );
+		mStorage.data[ v.size() ] = '\0';
+	}
 	sstring()
 	{
 		mStorage.data[0]=0;