58 lines
1.6 KiB
V
58 lines
1.6 KiB
V
fn show_array(name string, a []int) {
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eprintln('${name:10} .flags: ${a.flags:34} | .cap: ${a.cap:2} | .len: ${a.len:2} | .data: $a.data | $a')
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}
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fn trace_delete_elements(name string, mut a []int) int {
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a.delete_many(5, 3)
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show_array(name, a)
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a << 55
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show_array(name, a)
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a << 66
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show_array(name, a)
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a << 77
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res := a.cap
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eprintln(' << ${name:10} .cap: $a.cap >>')
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show_array(name, a)
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a << 88
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show_array(name, a)
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a << 99
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show_array(name, a)
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eprintln('-------------------------------')
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return res
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}
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fn test_array_cap_shrinkage_after_deletion() {
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mut a := [0]
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mut middle_cap := 0
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a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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middle_cap = trace_delete_elements('normal', mut a)
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assert middle_cap == 14
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assert a.len == 12
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assert a.cap == 14
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a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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unsafe { a.flags.set(.noslices) }
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middle_cap = dump(trace_delete_elements('noslices', mut a))
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assert middle_cap == 14
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assert a.len == 12
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assert a.cap == 14
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a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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unsafe { a.flags.set(.noshrink) }
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middle_cap = dump(trace_delete_elements('noshrink', mut a))
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assert middle_cap == 14
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assert a.len == 12
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assert a.cap == 14
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// Note: when *both* flags are set, the memory block for the array
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// should NOT shrink on deleting array elements, thus << after the
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// deletion, will still have space (till .cap is reached).
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a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]
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unsafe { a.flags.set(.noslices | .noshrink) }
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middle_cap = dump(trace_delete_elements('both', mut a))
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assert middle_cap == 10
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assert a.len == 12
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assert a.cap == 20
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}
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