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#include "testsuite.h"
#include <blitz/array.h>
using namespace blitz;
const int N=1000;
// To return an expression that references local arrays, the
// expression has to be wrapped in safeToReturn(), which turns
// FastArrayIterators into FastArrayCopyIterators which keep a copy of
// the arrays instead of referencing them.
// this is safe
BzBinaryExprResult<Multiply, Array<double,1>, Array<double,1> >::T_result::T_range_result
good()
{
Array<double,1> a(N);
a=tensor::i;
Array<double,1> b(N);
b=sin(a);
return safeToReturn(a*b);
}
// this is unsafe
BzBinaryExprResult<Multiply, Array<double,1>, Array<double,1> >::T_result
bad()
{
Array<double,1> a(N);
a=tensor::i;
Array<double,1> b(N);
b=sin(a);
return a*b;
}
int main()
{
// switch to expr=bad() and it will crash.
BzBinaryExprResult<Multiply, Array<double,1>, Array<double,1> >::T_result::T_range_result expr=good();
//BzBinaryExprResult<Multiply, Array<double,1>, Array<double,1> >::T_result expr=bad();
Array<double,1> result(N);
result=expr;
BZTEST(all(abs(result-tensor::i*sin(1.0*tensor::i))<1e-5));
return 0;
}
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