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OPENVXI中VXIvalue.h定义 /*
* Define each type as an opaque structure to get full information hiding
* while ensuring strong compiler type checks. The actual implementation
* defines these structures however it wants.
*/ #ifdef __cplusplus struct VXIValue; struct VXIBoolean; struct VXIInteger; struct VXIFloat; struct VXIString; struct VXIPtr; struct VXIContent; struct VXIMap; struct VXIVector; struct VXIDouble; struct VXIULong; struct VXILong; struct VXIMapIterator; #else typedef struct VXIValue { void * dummy; } VXIValue;
typedef struct VXIBoolean { void * dummy; } VXIBoolean;
typedef struct VXIInteger { void * dummy; } VXIInteger;
typedef struct VXIFloat { void * dummy; } VXIFloat;
typedef struct VXIString { void * dummy; } VXIString;
typedef struct VXIPtr { void * dummy; } VXIPtr;
typedef struct VXIContent { void * dummy; } VXIContent;
typedef struct VXIMap { void * dummy; } VXIMap;
typedef struct VXIVector { void * dummy; } VXIVector;
typedef struct VXIDouble { void * dummy; } VXIDouble;
typedef struct VXIULong { void * dummy; } VXIULong;
typedef struct VXILong { void * dummy; } VXILong; typedef struct VXIMapIterator { void * dummy; } VXIMapIterator;
#endif 而在value.hpp中：
// Forward declarations, required because we mask out the struct definitions
// in VXIvalue.h with the define below
class VXIValue;
class VXIBoolean;
class VXIInteger;
class VXIFloat;
class VXIPtr;
class VXIString;
class VXIContent;
class VXIMap;
class VXIVector;
class VXIMapIterator;
class VXIContentData;
class VXIDouble;
class VXIULong;
class VXILong; 你看一下黑体字部分 #ifdef __cplusplus 是判断编译器是C 还是C++编译器. |
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2007/8/13 11:47:00
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