reduce memory footprint

med/bit_string.hpp

@@ -75,14 +75,14 @@ class bits_variable
 		m_least_bits = calc_least_bits(std::size_t(num_bits));
 	}
 
-	uint16_t    m_num_bytes {0};
-	uint8_t     m_least_bits {0}; //0 - not set, or 1..8
-
 	union
 	{
 		uint8_t const*  external {nullptr};
 		uint8_t         internal[sizeof(uint64_t)];
 	}           m_data;
+
+	uint16_t    m_num_bytes {0};
+	uint8_t     m_least_bits {0}; //0 - not set, or 1..8
 };
 
 //fixed length bits
@@ -141,8 +141,8 @@ class bits_fixed<NBITS>
 	}
 
 private:
-	bool    m_set {false};
 	uint8_t m_data[size()];
+	bool    m_set {false};
 };
 
 template <class TRAITS>

med/field.hpp

@@ -68,8 +68,8 @@ class multi_field : public detail::define_meta_info<META_INFO>
 
 	struct field_value
 	{
-		field_type   value;
 		field_value* next;
+		field_type   value;
 	};
 
 	static constexpr std::size_t min = MIN;
@@ -239,10 +239,10 @@ class multi_field : public detail::define_meta_info<META_INFO>
 		return &m_tail->value;
 	}
 
-	field_value  m_fields[inplace];
-	std::size_t  m_count {0};
 	field_value* m_head {nullptr};
 	field_value* m_tail {nullptr};
+	std::size_t  m_count {0};
+	field_value  m_fields[inplace];
 };
 
 }	//end: namespace med

med/octet_string.hpp

@@ -99,9 +99,9 @@ class octets_var_intern
 	}
 
 private:
-	uint8_t     m_data[MAX_LEN];
 	num_octs_t  m_size {0};
 	bool        m_is_set {false};
+	uint8_t     m_data[MAX_LEN];
 };
 
 //fixed length octets with external storage

med/value.hpp

@@ -83,8 +83,8 @@ struct numeric_value : IE<IE_VALUE>
 #endif
 
 private:
-	bool       m_set{false};
 	value_type m_value{};
+	bool       m_set{false};
 };
 
 /**