json: serialisation/instantiation from size_t

json.cpp.rl

@@ -586,6 +586,12 @@ namespace json {
         return std::unique_ptr<node> (new number (i));
     }
 
+    template <>
+    std::unique_ptr<node>
+    io<size_t>::serialise (const size_t &i) {
+        return std::unique_ptr<node> (new number (i));
+    }
+
     template <>
     std::unique_ptr<node>
     io<float>::serialise (const float &f) {

json.hpp

@@ -190,6 +190,7 @@ namespace json {
         public:
             explicit number (double _value): m_value (_value) { ; }
             explicit number (int    _value): m_value (_value) { ; }
+            explicit number (size_t _value): m_value (_value) { ; }
 
             virtual const number& as_number  (void) const { return *this; }
             virtual bool          is_number  (void) const { return  true; }