histogram_axis_allocation_guards()

static void histogram_axis_allocation_guards ( void  )

static

Definition at line 87 of file postgis/cunit/cu_tester.c.

{
        /* Baseline: evenly split a 10k target over two varying dimensions. */
        CU_ASSERT_EQUAL(histogram_axis_cells(10000, 2, 0.5), 100);
 
        /* Skewed axis ratios that collapse to tiny powers still return one cell. */
        CU_ASSERT_EQUAL(histogram_axis_cells(10000, 2, 1e-9), 1);
 
        /* Denormals, NaNs and negative ratios should not leak to the histogram. */
        CU_ASSERT_EQUAL(histogram_axis_cells(10000, 2, NAN), 1);
        CU_ASSERT_EQUAL(histogram_axis_cells(10000, 2, -0.5), 1);
 
        /* Extremely aggressive ratios remain bounded by the square root of the budget. */
        CU_ASSERT_EQUAL(histogram_axis_cells(INT_MAX, 2, 1.0), (int)sqrt((double)INT_MAX * 2.0));
}

References histogram_axis_cells(), and NAN.

Referenced by main().

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