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%% options
copyright owner = Dirk Krause
copyright year = 2013-xxxx
license = bsd
%% header
namespace DkTools4 {
/** Comparable is a general base class for the library.
*/
class Comparable
{
public:
/** Compare object against another object or some data.
This comparison is used by sorted containers.
Example: When storing persons (name and age) we can use
crit=0 as comparison criteria in the container to compare
person object against person object. When searching the container
for an object with a specific name we can use crit=1 for comparisons
of the object against a string.
@param ptr Address of other object or data.
@param crit Comparison criteria, see documentation of
derived classes for class-specific numbers.
@return Positive number if larger than ptr, 0 if evaluates
equal to ptr, negative number if smaller than ptr.
*/
virtual
int
compareAgainst(void const *ptr, int crit) const = 0;
/** Compare two pointers
@param l Left pointer.
@param r Right pointer.
@param cr Comparison criteria.
@return 1 for left object is large, 0 for right object
is large, 0 for objects evaluating equally.
*/
static
int
compareTwoPointers(void const *l, void const *r, int cr);
}; /* End of class Comparable. */
} /* End of namespace DkTools4 */
%% module
#include "Dk4Comparable.h"
int
DkTools4::Comparable::compareTwoPointers(void const *l, void const *r, int cr)
{
int back = 0;
if(l) {
if(r) {
DkTools4::Comparable const *pl = (DkTools4::Comparable const *)l;
back = pl->compareAgainst(r, cr);
} else back = 1;
} else {
if(r) back = -1;
}
return back;
}
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