Fix

  error C2398: Element '2': conversion from 'int' to 'const std::basic_string_view<char,std::char_traits<char>>::size_type'
  requires a narrowing conversion

diff --git a/src/liborcus/gnumeric_value_format_parser.cpp b/src/liborcus/gnumeric_value_format_parser.cpp
index 822c1ba1..014068e9 100644
--- a/src/liborcus/gnumeric_value_format_parser.cpp
+++ b/src/liborcus/gnumeric_value_format_parser.cpp
@@ -12,6 +12,10 @@
 #include <cassert>
 #include <sstream>

+#include <boost/numeric/conversion/cast.hpp>
+
+using boost::numeric_cast;
+
 namespace orcus {

 std::size_t gnumeric_value_format_parser::get_pos() const
@@ -41,7 +45,8 @@ void gnumeric_value_format_parser::segment()
                 if (pos != 2)
                     throw parse_error("value format segment is not formatted properly", get_pos());

-                std::string_view s{p0, std::distance(p0, m_cur)};
+                auto n = std::distance(p0, m_cur);
+                std::string_view s{p0, numeric_cast<std::size_t>(n)};
                 if (s.empty())
                     throw parse_error("segment value is empty", get_pos());

@@ -51,7 +56,8 @@ void gnumeric_value_format_parser::segment()
             }
             case '=':
             {
-                std::string_view s{p0, std::distance(p0, m_cur)};
+                auto n = std::distance(p0, m_cur);
+                std::string_view s{p0, numeric_cast<std::size_t>(n)};
                 seg.type = to_gnumeric_value_format_type(s);
                 if (seg.type == gnumeric_value_format_type::unknown)
                 {
@@ -65,7 +71,8 @@ void gnumeric_value_format_parser::segment()
             }
             case ':':
             {
-                std::string_view s{p0, std::distance(p0, m_cur)};
+                auto n = std::distance(p0, m_cur);
+                std::string_view s{p0, numeric_cast<std::size_t>(n)};

                 switch (pos)
                 {