236 lines
7.3 KiB
C
236 lines
7.3 KiB
C
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#ifndef HX_NULL_H
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#define HX_NULL_H
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// --- null value ---------------------------------------------------------
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//
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// This is used by external operatator and return statments - Most will
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// use operator overloading to convert to the null pointer
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// Forward declare ...
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class String;
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class null;
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namespace hx { template<typename O> class ObjectPtr; }
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namespace hx { null NullArithmetic(const char *inText); }
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#define HX_NULL_COMPARE_OP(op,type,value) \
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bool operator op (const type &inRHS) const { return value; }
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#define HX_NULL_COMPARE_OPS(type) \
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HX_NULL_COMPARE_OP(<,type,false) \
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HX_NULL_COMPARE_OP(<=,type,false) \
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HX_NULL_COMPARE_OP(>,type,false) \
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HX_NULL_COMPARE_OP(>=,type,false) \
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HX_NULL_COMPARE_OP(==,type,false) \
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HX_NULL_COMPARE_OP(!=,type,true)
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#define HX_NULL_COMPARE_MOST_OPS(type) \
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HX_NULL_COMPARE_OP(<,type,false) \
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HX_NULL_COMPARE_OP(<=,type,false) \
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HX_NULL_COMPARE_OP(>,type,false) \
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HX_NULL_COMPARE_OP(>=,type,false)
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#define HX_COMPARE_NULL_OP(op,type,value) \
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inline bool operator op (type inLHS, const null &) { return value; }
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#define HX_COMPARE_NULL_OPS(type) \
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HX_COMPARE_NULL_OP(<,type,false) \
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HX_COMPARE_NULL_OP(<=,type,false) \
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HX_COMPARE_NULL_OP(>,type,false) \
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HX_COMPARE_NULL_OP(>=,type,false) \
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HX_COMPARE_NULL_OP(==,type,false) \
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HX_COMPARE_NULL_OP(!=,type,true)
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#define HX_COMPARE_NULL_MOST_OPS(type) \
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HX_COMPARE_NULL_OP(<,type,false) \
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HX_COMPARE_NULL_OP(<=,type,false) \
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HX_COMPARE_NULL_OP(>,type,false) \
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HX_COMPARE_NULL_OP(>=,type,false)
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#define HX_NULL_ARITHMETIC_OP(op) \
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template<typename T> inline null operator op (T t) const \
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{ return hx::NullArithmetic(#op); } \
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inline null operator op (const null &) const \
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{ return hx::NullArithmetic(#op); }
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#define HX_ARITHMETIC_NULL_OP(op) \
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template<typename T> inline null operator op (const T &, const null &) \
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{ return hx::NullArithmetic(#op); }
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class null
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{
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struct AnyArg
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{
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template<typename T>
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inline AnyArg(const T&) { }
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};
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public:
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inline null(){ }
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template<typename T> explicit inline null(const hx::ObjectPtr<T> &){ }
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template<typename T> explicit inline null(const String &){ }
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explicit inline null(double){ }
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explicit inline null(float){ }
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explicit inline null(int){ }
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explicit inline null(bool){ }
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template<typename T>
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T StaticCast() { return null(); }
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operator bool () { return false; }
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operator int () { return 0; }
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operator unsigned int () { return 0; }
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operator double () { return 0; }
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operator float () { return 0; }
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operator char () { return 0; }
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operator unsigned char () { return 0; }
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operator signed char () { return 0; }
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operator short () { return 0; }
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operator unsigned short () { return 0; }
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operator cpp::UInt64 () { return 0; }
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operator cpp::Int64 () { return 0; }
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template<typename T>
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inline operator typename hx::Native<T *> () const { return 0; }
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// Any pointer!
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//operator char * () { return 0; }
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//operator wchar_t * () { return 0; }
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template<typename T> operator T *() { return 0; }
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bool operator == (null inRHS) const { return true; }
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bool operator != (null inRHS) const { return false; }
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bool operator == (null inRHS) { return true; }
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bool operator != (null inRHS) { return false; }
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template<typename T> inline bool operator == (const hx::ObjectPtr<T> &) const;
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template<typename T> inline bool operator != (const hx::ObjectPtr<T> &) const;
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template<typename T> inline bool operator == (const Array<T> &) const;
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template<typename T> inline bool operator != (const Array<T> &) const;
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inline bool operator == (const hx::FieldRef &) const;
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inline bool operator != (const hx::FieldRef &) const;
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inline bool operator == (const hx::IndexRef &) const;
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inline bool operator != (const hx::IndexRef &) const;
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inline bool operator == (const Dynamic &) const;
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inline bool operator != (const Dynamic &) const;
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inline bool operator == (const String &) const;
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inline bool operator != (const String &) const;
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inline bool operator == (const cpp::Variant &v) const { return v.isNull(); }
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inline bool operator != (const cpp::Variant &v) const{ return !v.isNull(); }
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inline null operator - () const { return hx::NullArithmetic("-"); }
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inline null operator ! () const { return hx::NullArithmetic("!"); }
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template<class T> T operator()(const AnyArg &a0=0, const AnyArg &a1=0, const AnyArg &a2=0,
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const AnyArg &a4=0, const AnyArg &a5=0, const AnyArg &a6=0,
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const AnyArg &a7=0, const AnyArg &a8=0, const AnyArg &a9=0 )
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{
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hx::NullReference("Function Call", false);
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T nullDynamic;
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return nullDynamic;
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}
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HX_NULL_COMPARE_OPS(bool)
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HX_NULL_COMPARE_OPS(double)
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HX_NULL_COMPARE_OPS(float)
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HX_NULL_COMPARE_OPS(int)
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HX_NULL_COMPARE_OPS(unsigned int)
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HX_NULL_COMPARE_OPS(short)
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HX_NULL_COMPARE_OPS(unsigned short)
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HX_NULL_COMPARE_OPS(signed char)
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HX_NULL_COMPARE_OPS(unsigned char)
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HX_NULL_COMPARE_OPS(cpp::Int64)
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HX_NULL_COMPARE_OPS(cpp::UInt64)
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HX_NULL_COMPARE_MOST_OPS(String)
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HX_NULL_COMPARE_MOST_OPS(Dynamic)
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HX_NULL_COMPARE_MOST_OPS(hx::FieldRef)
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HX_NULL_COMPARE_MOST_OPS(hx::IndexRef)
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HX_NULL_COMPARE_OP(<,null,false)
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HX_NULL_COMPARE_OP(<=,null,true)
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HX_NULL_COMPARE_OP(>,null,false)
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HX_NULL_COMPARE_OP(>=,null,true)
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HX_NULL_ARITHMETIC_OP(+);
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HX_NULL_ARITHMETIC_OP(*);
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HX_NULL_ARITHMETIC_OP(-);
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HX_NULL_ARITHMETIC_OP(/);
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HX_NULL_ARITHMETIC_OP(%);
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HX_NULL_ARITHMETIC_OP(&);
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HX_NULL_ARITHMETIC_OP(|);
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HX_NULL_ARITHMETIC_OP(^);
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HX_NULL_ARITHMETIC_OP(>>);
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HX_NULL_ARITHMETIC_OP(<<);
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};
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namespace hx
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{
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template<typename T>
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struct Null
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{
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inline Null() : isNull(true) { }
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inline Null(const Null<T> &inOther) : isNull(inOther.isNull), value(inOther.value) { }
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inline Null(const T& inVal) : isNull(false), value(inVal) { }
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inline Null(const null &) : isNull(true) { }
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inline Null(const Dynamic &inVal)
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{
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isNull = null() == inVal;
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if (!isNull)
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value = inVal;
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}
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inline Null(const cpp::Variant &inVal)
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{
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isNull = inVal.isNull();
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if (!isNull)
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value = inVal;
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}
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inline operator Dynamic();
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inline T Default(T inDefault) { return isNull ? inDefault : value; }
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bool isNull;
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T value;
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};
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} // end namesapce hx
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typedef null Void;
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HX_COMPARE_NULL_OPS(bool)
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HX_COMPARE_NULL_OPS(double)
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HX_COMPARE_NULL_OPS(float)
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HX_COMPARE_NULL_OPS(int)
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HX_COMPARE_NULL_OPS(unsigned int)
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HX_COMPARE_NULL_OPS(short)
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HX_COMPARE_NULL_OPS(unsigned short)
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HX_COMPARE_NULL_OPS(signed char)
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HX_COMPARE_NULL_OPS(unsigned char)
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HX_COMPARE_NULL_OPS(cpp::UInt64)
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HX_COMPARE_NULL_OPS(cpp::Int64)
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HX_ARITHMETIC_NULL_OP(+)
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HX_ARITHMETIC_NULL_OP(*)
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HX_ARITHMETIC_NULL_OP(-)
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HX_ARITHMETIC_NULL_OP(/)
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HX_ARITHMETIC_NULL_OP(%)
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HX_ARITHMETIC_NULL_OP(&)
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HX_ARITHMETIC_NULL_OP(|)
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HX_ARITHMETIC_NULL_OP(^)
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HX_ARITHMETIC_NULL_OP(>>)
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HX_ARITHMETIC_NULL_OP(<<)
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// Other ops in Operator.h
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inline void *_hx_nullptr() { return 0; }
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#endif
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