38 lines
731 B
V
38 lines
731 B
V
// 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.
|
|
|
|
module builtin
|
|
|
|
struct Option {
|
|
data [255]byte
|
|
error string
|
|
ok bool
|
|
is_none bool
|
|
}
|
|
|
|
// `fn foo() ?Foo { return foo }` => `fn foo() ?Foo { return opt_ok(foo); }`
|
|
fn opt_ok(data voidptr, size int) Option {
|
|
if size >= 255 {
|
|
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
|
|
}
|
|
|
|
// used internally when returning `none`
|
|
fn opt_none() Option {
|
|
return Option{ is_none: true }
|
|
}
|
|
|
|
pub fn error(s string) Option {
|
|
return Option {
|
|
error: s
|
|
}
|
|
}
|
|
|
|
|