added field class

src/sql/field.cpp

@@ -2,6 +2,28 @@
 
 namespace matador::sql {
 
+field::field(std::string name)
+  : name_(std::move(name)), value_(nullptr), type_(field_traits<nullptr_t>::type())
+{}
+
+field::field(field &&x) noexcept
+  : name_(std::move(x.name_)), value_(std::move(x.value_)), type_(x.type_)
+{
+  x.value_ = nullptr;
+  x.type_ = field_type::Null;
+}
+
+field &field::operator=(field &&x) noexcept
+{
+  name_ = std::move(x.name_);
+  value_ = std::move(x.value_);
+  type_ = x.type_;
+  x.value_ = nullptr;
+  x.type_ = field_type::Null;
+
+  return *this;
+}
+
 const std::string &field::name() const
 {
   return name_;
@@ -9,36 +31,43 @@ const std::string &field::name() const
 
 std::ostream &operator<<(std::ostream &out, const field &col)
 {
+  out << col.str();
   return out;
 }
 
+std::string field::str() const
+{
+  return as<std::string>().value();
+}
+
 bool field::is_integer() const
 {
-  return false;
+  return type_ == field_type::Integer;
 }
 
 bool field::is_floating_point() const
 {
-  return false;
+  return type_ == field_type::FloatingPoint;
 }
 
 bool field::is_bool() const
 {
-  return false;
+  return type_ == field_type::Boolean;
 }
 
 bool field::is_string() const
 {
-  return false;
+  return type_ == field_type::String;
 }
 
 bool field::is_blob() const
 {
-  return false;
+  return type_ == field_type::Blob;
 }
 
 bool field::is_null() const
 {
-  return false;
+  return type_ == field_type::Null;
 }
+
 }