go - Slice index out of range but one space is free -


i trying figure out how slice resizing works , have following sample:

package main  import (     "fmt" )  func main() {      s := []byte{'a', 'w', 't', 'q', 'x'}     b := s[2:4]     fmt.println(s, len(s), cap(s))     fmt.println(string(b), len(b), cap(b))     b[1] = 'h'     b[2] = 'v'     fmt.println(string(b))  }

the compiler complains:

panic: runtime error: index out of range

b has capacity of 3, why can not assign 

b[2] = 'v'

the index valid in range of 0..len(b)-1. quoting spec:

the elements can addressed integer indices 0 through len(s)-1.

elements beyond length (but within capacity) unavailable through indexing. can access elements if reslice slice include elements (but within capacity).


Comments

Post a Comment

Popular posts from this blog

php - failed to open stream: HTTP request failed! HTTP/1.0 400 Bad Request -

this code i'm using find latitude , longitude of place: function coords($address){ echo $url="http://maps.googleapis.com/maps/api/geocode/json?address=".$address; $json = file_get_contents(urlencode($url)); $data = json_decode($json, true); print_r($data['results'][0]['geometry']['location']['lat']); print_r($data['results'][0]['geometry']['location']['lng']); } however returns warning: failed open stream: http request failed! http/1.0 400 bad request if use above code in simple procedure works fine not in function. note: have tried curl_init()... method produced same result? instead of encoding whole url encode address part. following code work fine $add='jamshoro phase 2'; $url="http://maps.googleapis.com/maps/api/geocode/json?address=".urlencode($add); $json = file_get_contents($url); $data = json_decode($json, true); print_r($data['r...
Read more

command line - Use qwinsta in PowerShell ISE -

i trying use qwinsta , rwinsta powershell code. when try run error "the term 'qwinsta' not recognized name of cmdlet, function, script file, or operable program." need able remotely on several machines without having add .dll's or modules other machines. tried terminal services powershell module, need able put on remote machines , not able that. within powershell ise how run qwinsta? not looking parse information gather it. following code have tried (which had found on site also): function get-tssessions { param( $computername = "localhost" ) qwinsta /server:$computername | #parse output foreach-object { $_.trim() -replace "\s+","," } | #convert objects convertfrom-csv } get-tssessions -computername "localhost" | ft -autosize best have running powershell ise (x86). when run command qwinsta there same error you. of course assuming have 64-bit os. th...
Read more

java - Incorrect order of records in M-M relationship in hibernate -

Image
i have 4 records in bridge table in mysql database. using @manytomany in hibernate, accurate order of employees incorrect incorrect of projects. following required material figure out doing mistake. this source. @entity @table(name="project") public class projectbean { @id @generatedvalue @column(name="project_id") private int projectid; @column(name="title") private string projecttitle; @manytomany(mappedby="projects") private collection<employeebean> employees; public projectbean() { employees = new arraylist<employeebean>(); } //getters & setters } @entity @table(name="employee") public class employeebean { @id @generatedvalue @column(name="employee_id") private int employee_id; @column(name="first_name") private string ...
Read more