Fix compilation on MSVC with std::string_view

close #1573

std::string_view::iterator is not necessarily a raw pointer.

Signed-off-by: Damian Jarek <damian.jarek93@gmail.com>

CHANGELOG.md

@@ -3,6 +3,7 @@ Version 251:
 * Clean up CI scripts
 * detect_ssl uses bool
 * launder pointers
+* Fix compilation on MSVC with std::string_view
 
 --------------------------------------------------------------------------------
 

include/boost/beast/http/detail/rfc7230.hpp

@@ -56,14 +56,6 @@ BOOST_BEAST_DECL
 std::int8_t
 unhex(char c);
 
-BOOST_BEAST_DECL
-void
-skip_ows(char const*& it, char const* end);
-
-BOOST_BEAST_DECL
-void
-skip_token(char const*& it, char const* last);
-
 BOOST_BEAST_DECL
 string_view
 trim(string_view s);

include/boost/beast/http/detail/rfc7230.ipp

@@ -219,8 +219,9 @@ unhex(char c)
     return tab[static_cast<unsigned char>(c)];
 }
 
+template <class ForwardIt>
 void
-skip_ows(char const*& it, char const* end)
+skip_ows(ForwardIt& it, ForwardIt end)
 {
     while(it != end)
     {
@@ -230,8 +231,9 @@ skip_ows(char const*& it, char const* end)
     }
 }
 
+template <class ForwardIt>
 void
-skip_token(char const*& it, char const* last)
+skip_token(ForwardIt& it, ForwardIt last)
 {
     while(it != last && is_token_char(*it))
         ++it;