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// This file demonstrates how to apply constraints to function
// arguments. Relys upon the SWIG library file 'constraints.i'
%module example
%include constraints.i
%{
#include <math.h>
double inv(double x) {
return 1.0/x;
}
int fact(int n) {
if (n <= 1) return 1;
else return n*fact(n-1);
}
void set_double(double *a, double v) {
*a = v;
}
%}
// Now wrap a few functions from the math library
double exp(double); // Accepts any value
double log(double POSITIVE); // Only accepts positive values
double inv(double NONZERO); // Only accepts nonzero values
double sqrt(double NONNEGATIVE); // Accepts non-negative values
// This applies a constraint to a different argument name
%apply Number NONNEGATIVE { int n };
int fact(int n); // int n will be nonnegative since we
// applied NONNEGATIVE to it above.
// A few memory management functions
%apply Pointer NONNULL {void *}; // Make void * arguments check for NULL
%apply Number POSITIVE {int size}; // Make size a positive integer
void *malloc(int size);
void free(void *);
%apply Pointer ALIGN8 {double *ptr}; // Forces ptr to be a 8-byte aligned pointer
void set_double(double *ptr, double value);
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