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v/vlib/compiler/tests/defer_test.v

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fn foo() string {
println('foo()')
return 'foo'
}
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fn foo2() string {
println('start')
defer { println('defer') }
defer { println('defer2') }
println('end')
return foo()
}
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fn test_defer() {
assert foo2() == 'foo'
}
fn set_num(i int, n mut Num) {
defer { n.val+=1 }
println("Hi")
if i < 5 {
return
} else {
n.val+=1
}
}
fn set_num_opt(n mut Num) ?int {
defer { n.val = 1 }
return 99
}
struct Num {
mut:
val int
}
fn test_defer_early_exit() {
mut sum := Num{0}
for i in 0..10 {
set_num(i, mut sum)
}
println("sum: $sum.val")
assert sum.val == 15
}
fn test_defer_option() {
mut ok := Num{0}
set_num_opt(mut ok)
assert ok.val == 1
}