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    • Dick Hollenbeck's avatar
      // Dick Hollenbeck's KiROUND R&D · c24863c0
      Dick Hollenbeck authored
      // This provides better project control over rounding to int from double
      // than wxRound() did.  This scheme provides better logging in Debug builds
      // and it provides for compile time calculation of constants.
      
      
      #include <stdio.h>
      #include <assert.h>
      #include <limits.h>
      
      //-----<KiROUND KIT>------------------------------------------------------------
      
      /**
       * KiROUND
       * rounds a floating point number to an int using
       * "round halfway cases away from zero".
       * In Debug build an assert fires if will not fit into an int.
       */
      
      #if defined( DEBUG )
      
      // DEBUG: a macro to capture line and file, then calls this inline
      
      static inline int KiRound( double v, int line, const char* filename )
      {
          v = v < 0 ? v - 0.5 : v + 0.5;
          if( v > INT_MAX + 0.5 )
          {
              printf( "%s: in file %s on line %d, val: %.16g too ' > 0 ' for int\n", __FUNCTION__, filename, line, v );
          }
          else if( v < INT_MIN - 0.5 )
          {
              printf( "%s: in file %s on line %d, val: %.16g too ' < 0 ' for int\n", __FUNCTION__, filename, line, v );
          }
          return int( v );
      }
      
      #define KiROUND( v )    KiRound( v, __LINE__, __FILE__ )
      
      #else
      
      // RELEASE: a macro so compile can pre-compute constants.
      
      #define KiROUND( v )  int( (v) < 0 ? (v) - 0.5 : (v) + 0.5 )
      
      #endif
      
      
      //-----</KiROUND KIT>-----------------------------------------------------------
      
      // Only a macro is compile time calculated, an inline function causes a static constructor
      // in a situation like this.
      // Therefore the Release build is best done with a MACRO not an inline function.
      int Computed = KiROUND( 14.3 * 8 );
      
      
      int main( int argc, char** argv )
      {
          for( double d = double(INT_MAX)-1;  d < double(INT_MAX)+8;  d += 2.0 )
          {
              int i = KiROUND( d );
      
              printf( "t: %d  %.16g\n", i, d );
          }
      
          return 0;
      }
      c24863c0
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