75 lines
1010 B
V
75 lines
1010 B
V
fn test_ptr_assign() {
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v := [int(5), 6, 77, 1]
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unsafe {
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mut p := &v[0]
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(*p)++
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p++ // p now points to v[1]
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(*p) += 2
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p += 2 // p now points to v[3]
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*p = 31
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}
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assert v[0] == 6
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assert v[1] == 8
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assert v[2] == 77
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assert v[3] == 31
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}
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fn test_double_ptr() {
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i := 5
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j := 7
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unsafe {
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mut x := &i
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mut p := &x
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(*p) = &j
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assert x == &j
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}
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// ///////
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mut x := &int(0)
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unsafe {
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mut p := &x
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(*p) = &int(1)
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}
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assert ptr_str(x) == ptr_str(&int(1))
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}
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fn test_ptr_infix() {
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v := 4
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mut q := unsafe {&v - 1}
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q = unsafe {q + 3}
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assert q == unsafe {&v + 2}
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}
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struct S1 {
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}
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[unsafe]
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fn (s S1) f() {
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}
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fn test_funcs() {
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s := S1{}
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unsafe {s.f()}
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_ = C.strerror(0) // [trusted] function prototype in builtin/cfns.c.v
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}
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fn test_if_expr_unsafe() {
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i := 4
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p := if true { unsafe {&i} } else { unsafe {&i} }
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assert *p == 4
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}
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fn unsafe_if_stmt() int {
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i := 4
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unsafe {
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if true {
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return (&i)[0]
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}
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}
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return i
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}
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fn test_unsafe_if_stmt() {
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x := unsafe_if_stmt()
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assert x == 4
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}
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