entity query and record progress

include/matador/sql/field.hpp

@@ -0,0 +1,37 @@
+#ifndef QUERY_FIELD_HPP
+#define QUERY_FIELD_HPP
+
+#include "matador/sql/any_type.hpp"
+#include "matador/sql/any_type_to_visitor.hpp"
+
+#include <string>
+
+namespace matador::sql {
+
+class field
+{
+public:
+
+  [[nodiscard]] const std::string& name() const;
+
+  template<class Type>
+  Type as() const
+  {
+    const Type* ptr= std::get_if<Type>(&value_);
+    if (ptr) {
+      return *ptr;
+    }
+    any_type_to_visitor<Type> visitor;
+    std::visit(visitor, const_cast<any_type&>(value_));
+    return visitor.result;
+  }
+
+  friend std::ostream& operator<<(std::ostream &out, const field &col);
+
+private:
+  std::string name_;
+  any_type value_;
+};
+
+}
+#endif //QUERY_FIELD_HPP