common lisp - How to clear string with fill pointer? -

-

here's example saw @ hyperspec:

(setq fstr (make-array '(0) :element-type 'base-char                              :fill-pointer 0 :adjustable t)) (with-output-to-string (s fstr)     (format s "here's output"))

so fstr holds here's output q: how simple clear/reset on fstrin case want start on , put new in it, is, not concatenate more onto it? or have redo top expression fstr being set up?

set fill pointer:

cl-user 3 > (setq fstr (make-array '(0) :element-type 'base-char                                    :fill-pointer 0 :adjustable t)) ""  cl-user 4 > (with-output-to-string (s fstr)               (format s "here's output")) nil  cl-user 5 > fstr "here's output"  cl-user 6 > (setf (fill-pointer fstr) 0) 0  cl-user 7 > fstr ""  cl-user 8 > (with-output-to-string (s fstr)               (format s "here's more output")) nil  cl-user 9 > fstr "here's more output"

you can call adjust-array change array size.

cl-user 16 > (setf (fill-pointer fstr) 0) 0  cl-user 17 > (adjust-array fstr 0) ""

Comments

Post a Comment

Popular posts from this blog

javascript - Chart.js (Radar Chart) different scaleLineColor for each scaleLine -

-
Image
i try , create radar chart using chart.js has various colours each scaleline, or coloured between scalelines. wondering if possible? from: to: i have working graph, though there doesn't seem method change individual scale lines. kind regards leigh you can extend radar chart type this, so chart.types.radar.extend({ name: "radaralt", initialize: function (data) { chart.types.radar.prototype.initialize.apply(this, arguments); var originalscaledraw = this.scale.draw; var ctx = this.chart.ctx; this.scale.draw = function () { var linewidth = this.linewidth; // bypasses line drawing in originalscaledraw this.linewidth = linewidth; originalscaledraw.apply(this, arguments); ctx.linewidth = this.linewidth; var scale = this; // draw chart.helpers.each(scale.ylabels, function (label, index) { // color of ...
Read more

apache - Error with PHP mail(): Multiple or malformed newlines found in additional_header -

-
suddenly have started receiving above error without changes having been made script. host 1and1 (i know...) the script still works fine on different server, , suspicion there must have been server config change has lead this, although hosts plead ignorance. there's no information on above error @ in google can find - have ideas? server running apache if helps. had similar problem. came out of blue. no php code changed. what changed: php upgraded 5.5.25-1 5.5.26. a security risk in php mail() function has been fixed , newlines in additional_headers allowed no more. because newlines mean: starts email message (and surely don't want inject newlines through headers followed evil message). what have worked fine, e.g. having newlines after headers or passing whole message additional_headers , function no more. solution : sanitize headers. no multiple newlines in additional_headers argument. these count "multiple or malformed newlines":...
Read more

java - Android – MapFragment overlay button shadow, just like MyLocation button -

-
Image
i'm struggling add shadow custom overlay button on google map. goal make custom button google's mylocation button. here's how app looks now: layout.xml <relativelayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" xmlns:map="http://schemas.android.com/apk/res-auto" android:layout_height="match_parent" android:layout_width="match_parent" style="@style/apptheme"> <fragment android:layout_width="match_parent" android:layout_height="match_parent" android:id="@+id/map" tools:context=".mapsactivity" android:name="com.google.android.gms.maps.supportmapfragment" android:layout_alignparentend="true" android:layout_alignparentstart="true" android:layout_alignparentbottom="true" ...
Read more