v2 / vlib / v / tests / casts / cast_to_empty_interface_test.v
45 lines · 36 sloc · 1.16 KB · cf4efb7ebe8b465801ace27d0f5719410b02f6cb
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1interface Any {}


2


3fn thing(any Any) string {


4    return match any {


5        int { 'int${any:17}' }


6        f64 { 'f64${any:20}' }


7        else { 'literal type tag?${any:10}' }


8    }


9}


10


11fn test_cast_to_empty_interface() {


12    mut ret_strings := []string{}


13    mut arr := [Any(int(11)), int(22), Any(8888), 9999, Any(f64(1.11)), f64(2.22), Any(8.88), 9.99]


14


15    for i in arr {


16        println(thing(i))


17        ret_strings << thing(i)


18    }


19


20    assert ret_strings.len == 8


21    assert ret_strings[0] == 'int               11'


22    assert ret_strings[1] == 'int               22'


23    assert ret_strings[2] == 'int             8888'


24    assert ret_strings[3] == 'int             9999'


25    assert ret_strings[4] == 'f64                1.11'


26    assert ret_strings[5] == 'f64                2.22'


27    assert ret_strings[6] == 'f64                8.88'


28    assert ret_strings[7] == 'f64                9.99'


29}


30


31type EmptyInterfaceCallback = fn ()


32


33fn empty_interface_callback() {}


34


35fn test_append_function_to_empty_interface_array() {


36    mut callbacks := []EmptyInterfaceCallback{}


37    callbacks << empty_interface_callback


38


39    mut values := []Any{}


40    values << callbacks


41    values << empty_interface_callback


42


43    assert values.len == 2


44    assert '${values}'.contains('Any(fn ())')


45}


46