diff options
| author | Dmitry Vyukov <dvyukov@google.com> | 2018-05-17 12:02:30 +0200 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2018-05-17 12:02:30 +0200 |
| commit | 031c7941d7bd97b4acbf9bcd2513ed695b387ff2 (patch) | |
| tree | d64f385075a30115dd950a8e2d714e22eef5e18b /docs/syscall_descriptions_syntax.md | |
| parent | 90c54c496b268f0977517448e8f7de54e93b975d (diff) | |
pkg/compiler: add optional builtin template
type optional[T] [
val T
void void
] [varlen]
Diffstat (limited to 'docs/syscall_descriptions_syntax.md')
| -rw-r--r-- | docs/syscall_descriptions_syntax.md | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/docs/syscall_descriptions_syntax.md b/docs/syscall_descriptions_syntax.md index 47986651c..4708dc804 100644 --- a/docs/syscall_descriptions_syntax.md +++ b/docs/syscall_descriptions_syntax.md @@ -185,10 +185,7 @@ type filename string[filename] ## Type Templates -**Note: type templates are experimental, can have error handling bugs and are subject to change** - Type templates can be declared as follows: - ``` type buffer[DIR] ptr[DIR, array[int8]] type fileoff[BASE] BASE @@ -200,11 +197,18 @@ type nlattr[TYPE, PAYLOAD] { ``` and later used as follows: - ``` syscall(a buffer[in], b fileoff[int64], c ptr[in, nlattr[FOO, int32]]) ``` +There is builtin type template `optional` defined as: +``` +type optional[T] [ + val T + void void +] [varlen] +``` + ## Length You can specify length of a particular field in struct or a named argument by using `len`, `bytesize` and `bitsize` types, for example: |