user_type.h File Reference

#include "platform.h"

Go to the source code of this file.

Macros
#define	ETL_DECLARE_USER_TYPE(TypeName, ValueType)
#define	ETL_USER_TYPE(enum_name, value)
#define	ETL_END_USER_TYPE(TypeName)

Macro Definition Documentation

ETL_DECLARE_USER_TYPE

#define ETL_DECLARE_USER_TYPE	(		TypeName,
			ValueType )

ETL_DECLARE_USER_TYPE(CompassDirection, int)
ETL_USER_TYPE(North, 0)
ETL_USER_TYPE(South, 180)
ETL_USER_TYPE(East,  90)
ETL_USER_TYPE(West,  270)
ETL_END_USER_TYPE(CompassDirection)

Using the enumeration.

CompassDirection direction;          // Default construction.
 
direction = CompassDirection::North; // Assignment from an enumeration
constant;
 
int value = int(direction);          // Explicit conversion to 'int'.
int value = direction.get();
 
int& value = direction.get();        // Bind to internal value.
const int& value = direction.get();
 
direction = CompassDirection(value); // Explicit conversion from 'int'.
 
direction = CompassDirection(3);     // Explicit conversion from a value.
 
++direction;                         // Manipulate the value;
direction -= CompassDirection(20);
 
direction = value;                   // Implicit conversion from 'int'. ****
Compilation error ****

ETL_END_USER_TYPE

#define ETL_END_USER_TYPE

(

TypeName

)

Value:

  }                                          \
  ;                                          \
  TypeName(enum_type value_)                 \
    : value(static_cast<value_type>(value_)) \
  {                                          \
  }                                          \
  }                                          \
  ;

ETL_USER_TYPE

#define ETL_USER_TYPE	(		enum_name,
			value )

Value:

enum_name = value,