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v/vlib/builtin/option.v

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// Copyright (c) 2019 Alexander Medvednikov. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
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module builtin
struct Option {
data [255] byte
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error string
ok bool
}
// `fn foo() ?Foo { return foo }` => `fn foo() ?Foo { return opt_ok(foo); }`
fn opt_ok(data voidptr, size int) Option {
if size > 255 {
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panic('option size too big: $size (max is 255), this is a temporary limit')
}
res := Option {
ok: true
}
C.memcpy(res.data, data, size)
return res
}
pub fn error(s string) Option {
return Option {
error: s
}
}