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/**
@file G3D/enumclass.h
@maintainer Morgan McGuire, http://graphics.cs.williams.edu
@created 2007-01-27
@edited 2007-07-20
*/
#ifndef G3D_enumclass_h
#define G3D_enumclass_h
#include "G3D/HashTrait.h"
#include "G3D/BinaryInput.h"
#include "G3D/BinaryOutput.h"
/**
\def G3D_DECLARE_ENUM_CLASS_METHODS
\brief Creates a series of methods that turn a class into a scoped enumeration.
Uses the "Intelligent Enum" design pattern
http://www.codeguru.com/cpp/cpp/cpp_mfc/article.php/c4001/
Enum classes are initialized to their zero value by default.
You must implement the following method before calling G3D_DECLARE_ENUM_CLASS_METHODS, as either:
<pre>
static const char* toString(int i, Value& v) {
static const char* str[] = {"FUEL", "FOOD", "WATER", NULL}; // Whatever your enum values are
static const Value val[] = {FUEL, FOOD, WATER}; // Whatever your enum values are
const char* s = str[i];
if (s) {
v = val[i];
}
return s;
}
</pre>
See GLG3D/GKey.h for an example.
\sa G3D_DECLARE_ENUM_CLASS_HASHCODE
*/
#define G3D_DECLARE_ENUM_CLASS_METHODS(Classname)\
private: \
void fromString(const std::string& x) {\
Value v;\
const char* s;\
int i = 0;\
\
do {\
s = toString(i, v);\
if (x == s) {\
value = v;\
return;\
}\
++i;\
} while (s);\
}\
\
public:\
\
const char* toString() const {\
const char* s;\
int i = 0;\
Value v = (Value)0;\
while (true) {\
s = toString(i, v);\
if ((s == NULL) || (v == value)) {\
return s;\
}\
++i;\
}\
return NULL;\
}\
\
explicit Classname(const std::string& x) : value((Value)0) {\
fromString(x);\
}\
\
Classname(const Any& a) : value((Value)0) {\
fromString(a.string());\
}\
\
operator Any() const {\
return Any(toString());\
}\
\
Classname(char v) : value((Value)v) {}\
\
Classname() : value((Value)0) {}\
\
Classname(const Value v) : value(v) {}\
\
explicit Classname(int v) : value((Value)v) {}\
\
/** Support cast back to the Value type, which is needed to allow implicit assignment inside unions. */\
/*inline operator Value() const {
return value;
}*/\
\
operator int() const {\
return (int)value;\
}\
\
bool operator== (const Classname other) const {\
return value == other.value;\
}\
\
bool operator== (const Classname::Value other) const {\
return value == other;\
}\
\
bool operator!= (const Classname other) const {\
return value != other.value;\
}\
\
bool operator!= (const Classname::Value other) const {\
return value != other;\
}\
\
bool operator< (const Classname other) const {\
return value < other.value;\
}\
\
bool operator> (const Classname other) const {\
return value > other.value;\
}\
\
bool operator>= (const Classname other) const {\
return value >= other.value;\
}\
\
bool operator<= (const Classname other) const {\
return value <= other.value;\
}\
\
bool operator< (const Value other) const {\
return value < other;\
}\
\
bool operator> (const Value other) const {\
return value > other;\
}\
\
bool operator<= (const Value other) const {\
return value <= other;\
}\
\
bool operator>= (const Value other) const {\
return value >= other;\
}\
\
Classname& operator-- () {\
value = (Value)((int)value - 1);\
return *this;\
}\
\
Classname& operator++ () {\
value = (Value)((int)value + 1);\
return *this;\
}\
\
Classname& operator+= (const int x) {\
value = (Value)((int)value + x);\
return *this;\
}\
\
Classname& operator-= (const int x) {\
value = (Value)((int)value - x);\
return *this;\
}\
\
Classname operator+ (const int x) const {\
return Classname((int)value + x);\
}\
\
Classname operator- (const int x) const {\
return Classname((int)value - x);\
}\
\
unsigned int hashCode() const {\
return (unsigned int)value;\
}\
\
void serialize(BinaryOutput& b) const {\
b.writeInt32(value);\
}\
\
void deserialize(BinaryInput& b) {\
value = (Value)b.readInt32();\
}
/** \def G3D_DECLARE_ENUM_CLASS_HASHCODE
*/
#define G3D_DECLARE_ENUM_CLASS_HASHCODE(Classname)\
template <> struct HashTrait<Classname::Value> \
{ \
static size_t hashCode(Classname::Value key) { return static_cast<size_t>(key); } \
}; \
\
template <> struct HashTrait<Classname> \
{ \
static size_t hashCode(Classname key) { return static_cast<size_t>(key.hashCode()); } \
};
#endif
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