platform.h.in

来自「在Linux下做的QuadTree的程序」· IN 代码 · 共 70 行

#ifndef GEOS_PLATFORM_H
#define GEOS_PLATFORM_H

/* Set to 1 if you have `int64_t' type */
#undef HAVE_INT64_T_64

/* Set to 1 if `long int' is 64 bits */
#undef HAVE_LONG_INT_64

/* Set to 1 if `long long int' is 64 bits */
#undef HAVE_LONG_LONG_INT_64

/* Set to 1 if you have ieeefp.h */
#undef HAVE_IEEEFP_H

#ifdef HAVE_IEEEFP_H
extern "C"
{
#include <ieeefp.h>
}
#endif

#ifdef HAVE_INT64_T_64
extern "C"
{
#include <inttypes.h>
}
#endif

#if defined(__GNUC__) && defined(_WIN32)
/* For MingW the appropriate definitions are included in
 math.h and float.h but the definitions in 
 math.h are only included if __STRICT_ANSI__
 is not defined.  Since GEOS is compiled with -ansi that
 means those definitions are not available. */
#include <float.h>
#endif


//Defines NaN for intel platforms
//Don't forget to define infinities
#define DoubleNotANumber 1.7e-308
#define DoubleInfinity 1.7e+308
#define DoubleNegInfinity -1.7e+308

#define FINITE(x) ( (x) != DoubleNotANumber && (x) != DoubleInfinity && (x) != DoubleNegInfinity )
#define ISNAN(x) ( (x) == DoubleNotANumber )

#ifdef HAVE_INT64_T_64
  typedef int64_t int64;
#else
# ifdef HAVE_LONG_LONG_INT_64
   typedef long long int int64;
# else
   typedef long int int64;
#  ifndef HAVE_LONG_INT_64
#   define INT64_IS_REALLY32 1
#   warning "Could not find 64bit integer definition!"
#  endif
# endif
#endif

inline int getMachineByteOrder() {
	static int endian_check = 1; // don't modify !!
	return *((char *)&endian_check); // 0 == big_endian | xdr,
					 // 1 == little_endian | ndr
}

#endif