diff options
Diffstat (limited to 'lib/DATS/valid.dats')
| -rw-r--r-- | lib/DATS/valid.dats | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/lib/DATS/valid.dats b/lib/DATS/valid.dats new file mode 100644 index 0000000..f4ea0aa --- /dev/null +++ b/lib/DATS/valid.dats @@ -0,0 +1,15 @@ +#define ATS_DYNLOADFLAG 0 +staload "lib/SATS/valid.sats" + +assume valid(a:t@ype,b:bool) = (a,bool b) + +implement{a} create_valid(value : a) = (value,true) + +// Create unvalid value by casting null pointer to type. +implement{a} create_unvalid() = let + staload UN = "prelude/SATS/unsafe.sats" +in + ($UN.ptr0_get<a>(the_null_ptr),false) //UNSAFE: +end + +implement{a} unwrap_valid(v) = v.0 |