Use more space-efficient ints in code element.

Author: tinko92

include/boost/geometry/srs/projections/code.hpp

@@ -10,14 +10,13 @@
 #ifndef BOOST_GEOMETRY_PROJECTIONS_CODE_HPP
 #define BOOST_GEOMETRY_PROJECTIONS_CODE_HPP
 
+#include <cstdint>
 
 #include <boost/geometry/srs/projections/dpar.hpp>
 
-
 namespace boost { namespace geometry { namespace projections
 {
 
-
 #ifndef DOXYGEN_NO_DETAIL
 namespace detail
 {
@@ -43,10 +42,10 @@ namespace detail
         };
 
         int code;
-        int parameter_count;
+        std::int8_t parameter_count;
         // Not bundling the following together into a struct to avoid 8-byte-alignment.
-        int parameter_ids[MaxParams];
-        char parameter_variant_tags[MaxParams];
+        std::int16_t parameter_ids[MaxParams];
+        std::int8_t parameter_variant_tags[MaxParams];
         parameter_variant parameters[MaxParams];
     };