56 lines
928 B
V
56 lines
928 B
V
// Copyright (c) 2019-2020 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 Option2<T> {
|
|
data T
|
|
error string
|
|
ecode int
|
|
ok bool
|
|
is_none bool
|
|
}
|
|
*/
|
|
|
|
|
|
struct Option {
|
|
data [400]byte
|
|
error string
|
|
ecode int
|
|
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 >= 400 {
|
|
panic('option size too big: $size (max is 400), 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
|
|
}
|
|
}
|
|
|
|
pub fn error_with_code(s string, code int) Option {
|
|
return Option{
|
|
error: s
|
|
ecode: code
|
|
}
|
|
}
|
|
|