diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/DATS/valid.dats | 6 | ||||
| -rw-r--r-- | lib/SATS/valid.sats | 15 |
2 files changed, 14 insertions, 7 deletions
diff --git a/lib/DATS/valid.dats b/lib/DATS/valid.dats index f4ea0aa..c13386e 100644 --- a/lib/DATS/valid.dats +++ b/lib/DATS/valid.dats @@ -1,9 +1,9 @@ #define ATS_DYNLOADFLAG 0 staload "lib/SATS/valid.sats" -assume valid(a:t@ype,b:bool) = (a,bool b) +assume valid(a:viewt@ype,b:bool) = (a,bool b) -implement{a} create_valid(value : a) = (value,true) +implement{a} create_valid(value) = (value,true) // Create unvalid value by casting null pointer to type. implement{a} create_unvalid() = let @@ -13,3 +13,5 @@ in end implement{a} unwrap_valid(v) = v.0 + +implement{a} is_valid(v) = v.1 diff --git a/lib/SATS/valid.sats b/lib/SATS/valid.sats index e3841e0..83081fe 100644 --- a/lib/SATS/valid.sats +++ b/lib/SATS/valid.sats @@ -3,16 +3,21 @@ // It's a replacement of Optional, but can be allocated on stack, so no heap allocaton needed. // When unvalid, it should be not possible to get unvalid value, thats why abstract type is used. // bool b: true means valid, false unvalid -abst@ype valid(a:t@ype,b:bool) = (a,bool b) +absviewt@ype valid(a:viewt@ype,b:bool) = (a,bool b) -typedef Valid(a:t@ype) = [b : bool] valid(a,b) +viewtypedef Valid(a:viewt@ype) = [b : bool] valid(a,b) // Wraps valid value. -fn {a:t@ype} create_valid(value : a) : valid(a,true) +fn {a:viewt@ype} create_valid(a) : valid(a,true) // Creates unvalid type. -fn {a:t@ype} create_unvalid() : valid(a,false) +fn {a:viewt@ype} create_unvalid() : valid(a,false) // Only function that allows getting value. Only accepts valid values. -fn {a:t@ype} unwrap_valid(valid(a,true)) : a +fn {a:viewt@ype} unwrap_valid(valid(a,true)) : a + +castfn destroy_unvalid{a:viewt@ype}(valid(a,false)) : void + +// Check if value is valid +fn{a:viewt@ype} is_valid{b:bool}(!valid(a,b)) : bool b |