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https://github.com/golang/go
synced 2024-11-12 09:20:22 -07:00
- added Init() function so that vectors can be used w/o New():
var v Vector.Vector; v.Init(); ... - clear vector elements in Reset - removed some comments that seem redundant R=r DELTA=16 (9 added, 5 deleted, 2 changed) OCL=19247 CL=19247
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@ -24,9 +24,14 @@ export type Vector struct {
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}
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func (v *Vector) Init() {
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v.elem = new([]Element, 8) [0 : 0]; // capacity must be > 0!
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}
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export func New() *Vector {
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v := new(Vector);
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v.elem = new([]Element, 8) [0 : 0]; // capacity must be > 0!
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v.Init();
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return v;
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}
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@ -37,13 +42,11 @@ func (v *Vector) Len() int {
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func (v *Vector) At(i int) Element {
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// range check unnecessary - done by runtime
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return v.elem[i];
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}
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func (v *Vector) Set(i int, e Element) {
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// range check unnecessary - done by runtime
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v.elem[i] = e;
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}
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@ -51,24 +54,25 @@ func (v *Vector) Set(i int, e Element) {
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func (v *Vector) Remove(i int) Element {
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ret := v.elem[i];
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n := v.Len();
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// range check unnecessary - done by runtime
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for j := i + 1; j < n; j++ {
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v.elem[j - 1] = v.elem[j];
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}
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var e Element;
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v.elem[n - 1] = e; // don't set to nil - may not be legal in the future
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v.elem[n - 1] = nil; // support GC, nil out entry
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v.elem = v.elem[0 : n - 1];
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return ret;
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}
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func (v *Vector) Reset() {
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// support GC, nil out entries
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for j := len(v.elem) - 1; j >= 0; j-- {
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v.elem[j] = nil;
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}
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v.elem = v.elem[0:0];
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}
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func (v *Vector) Insert(i int, e Element) {
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n := v.Len();
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// range check unnecessary - done by runtime
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// grow array by doubling its capacity
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if n == cap(v.elem) {
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