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go spec: arguments for append may overlap

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Fixes #4142.

R=rsc, r, iant, ken, remyoudompheng
CC=golang-dev
https://golang.org/cl/6567062
This commit is contained in:
Robert Griesemer 2012-09-28 15:55:38 -07:00
parent 7c8e26ee2f
commit 0c494718af
1 changed files with 12 additions and 8 deletions
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10
doc/go_spec.html
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@ -1,6 +1,6 @@
<!--{ <!--{
"Title": "The Go Programming Language Specification", "Title": "The Go Programming Language Specification",
"Subtitle": "Version of September 26, 2012", "Subtitle": "Version of September 28, 2012",
"Path": "/ref/spec" "Path": "/ref/spec"
}--> }-->
@ -4903,7 +4903,10 @@ m := make(map[string]int, 100) // map with initial space for 100 elements
<h3 id="Appending_and_copying_slices">Appending to and copying slices</h3> <h3 id="Appending_and_copying_slices">Appending to and copying slices</h3>
<p> <p>
Two built-in functions assist in common slice operations. The built-in functions <code>append</code> and <code>copy</code> assist in
common slice operations.
For both functions, the result is independent of whether the memory referenced
by the arguments overlaps.
</p> </p>
<p> <p>
@ -4937,6 +4940,7 @@ s0 := []int{0, 0}
s1 := append(s0, 2) // append a single element s1 == []int{0, 0, 2} s1 := append(s0, 2) // append a single element s1 == []int{0, 0, 2}
s2 := append(s1, 3, 5, 7) // append multiple elements s2 == []int{0, 0, 2, 3, 5, 7} s2 := append(s1, 3, 5, 7) // append multiple elements s2 == []int{0, 0, 2, 3, 5, 7}
s3 := append(s2, s0...) // append a slice s3 == []int{0, 0, 2, 3, 5, 7, 0, 0} s3 := append(s2, s0...) // append a slice s3 == []int{0, 0, 2, 3, 5, 7, 0, 0}
s4 := append(s3[3:6], s3[2:]...) // append overlapping slice s4 == []int{3, 5, 7, 2, 3, 5, 7, 0, 0}
var t []interface{} var t []interface{}
t = append(t, 42, 3.1415, "foo") t == []interface{}{42, 3.1415, "foo"} t = append(t, 42, 3.1415, "foo") t == []interface{}{42, 3.1415, "foo"}
@ -4948,7 +4952,7 @@ b = append(b, "bar"...) // append string contents b == []byte{'b', 'a', 'r
<p> <p>
The function <code>copy</code> copies slice elements from The function <code>copy</code> copies slice elements from
a source <code>src</code> to a destination <code>dst</code> and returns the a source <code>src</code> to a destination <code>dst</code> and returns the
number of elements copied. Source and destination may overlap. number of elements copied.
Both arguments must have <a href="#Type_identity">identical</a> element type <code>T</code> and must be Both arguments must have <a href="#Type_identity">identical</a> element type <code>T</code> and must be
<a href="#Assignability">assignable</a> to a slice of type <code>[]T</code>. <a href="#Assignability">assignable</a> to a slice of type <code>[]T</code>.
The number of elements copied is the minimum of The number of elements copied is the minimum of