diff options
| -rw-r--r-- | doc/go_spec.html | 10 | ||||
| -rw-r--r-- | src/unsafe/unsafe.go | 5 |
2 files changed, 12 insertions, 3 deletions
diff --git a/doc/go_spec.html b/doc/go_spec.html index b59b37fd55..e0602418e8 100644 --- a/doc/go_spec.html +++ b/doc/go_spec.html @@ -1,6 +1,6 @@ <!--{ "Title": "The Go Programming Language Specification", - "Subtitle": "Version of Jun 22, 2021", + "Subtitle": "Version of Jun 28, 2021", "Path": "/ref/spec" }--> @@ -6790,10 +6790,16 @@ and whose length and capacity are <code>len</code>: </pre> <p> +As a special case, if <code>ptr</code> is <code>nil</code> and <code>len</code> is zero, +<code>Slice</code> returns <code>nil</code>. +</p> + +<p> The <code>len</code> argument must be of integer type or an untyped <a href="#Constants">constant</a>. A constant <code>len</code> argument must be non-negative and <a href="#Representability">representable</a> by a value of type <code>int</code>; if it is an untyped constant it is given type <code>int</code>. -If <code>ptr</code> is <code>nil</code> or <code>len</code> is negative at run time, +At run time, if <code>len</code> is negative, +or if <code>ptr</code> is <code>nil</code> and <code>len</code> is not zero, a <a href="#Run_time_panics">run-time panic</a> occurs. </p> diff --git a/src/unsafe/unsafe.go b/src/unsafe/unsafe.go index ecbd28c523..eaf72c9618 100644 --- a/src/unsafe/unsafe.go +++ b/src/unsafe/unsafe.go @@ -221,8 +221,11 @@ func Add(ptr Pointer, len IntegerType) Pointer // // (*[len]ArbitraryType)(unsafe.Pointer(ptr))[:] // +// As a special case, if ptr is nil and len is zero, Slice returns nil. +// // The len argument must be of integer type or an untyped constant. // A constant len argument must be non-negative and representable by a value of type int; // if it is an untyped constant it is given type int. -// If ptr is nil or len is negative at run time, a run-time panic occurs. +// At run time, if len is negative, or if ptr is nil and len is not zero, +// a run-time panic occurs. func Slice(ptr *ArbitraryType, len IntegerType) []ArbitraryType |