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Name	Size	Permission
arrayfuns.hlp	1.79 KB	-rw-r--r--
base64funs.hlp	5.92 KB	-rw-r--r--
chksumfuns.hlp	1.82 KB	-rw-r--r--
cmdopt.hlp	6.83 KB	-rw-r--r--
csvfuns.hlp	14.14 KB	-rw-r--r--
forkfuns.hlp	5.42 KB	-rw-r--r--
fswalk.hlp	4.2 KB	-rw-r--r--
glob.hlp	458 B	-rw-r--r--
histfuns.hlp	7.08 KB	-rw-r--r--
jsonfuns.hlp	3.15 KB	-rw-r--r--
listfuns.hlp	5.68 KB	-rw-r--r--
onigfuns.hlp	5.3 KB	-rw-r--r--
pcrefuns.hlp	6.45 KB	-rw-r--r--
pngfuns.hlp	8.86 KB	-rw-r--r--
print.hlp	1.92 KB	-rw-r--r--
process.hlp	7.45 KB	-rw-r--r--
profile.hlp	3.38 KB	-rw-r--r--
randfuns.hlp	15.06 KB	-rw-r--r--
readascii.hlp	4.7 KB	-rw-r--r--
require.hlp	2.38 KB	-rw-r--r--
setfuns.hlp	3.33 KB	-rw-r--r--
slsmg.hlp	12.42 KB	-rw-r--r--
sockfuns.hlp	6.34 KB	-rw-r--r--
statsfuns.hlp	24.29 KB	-rw-r--r--
structfuns.hlp	2.48 KB	-rw-r--r--

Code Editor : require.hlp

_featurep

SYNOPSIS
  Test whether or not a feature is present

USAGE
  Int_Type _featurep (String_Type feature [,String_Type namespace])

DESCRIPTION
  The `_featurep' function returns a non-zero value if the specified
  feature is present.  Otherwise, it returns 0 to indicate that the feature
  has not been loaded.

SEE ALSO
  require, _featurep

--------------------------------------------------------------

require

SYNOPSIS
  Make sure a feature is present, and load it if not

USAGE
  require (feature [,namespace [,file]])

String_Type feature, namespace, file;

DESCRIPTION
  The `require' function ensures that a specified "feature" is present.
  If the feature is not present, the `require' function will attempt to
  load the feature from a file.  If the `namespace' argument is present
  and non-NULL, the specified namespace will be used.  The default is to use
  the current non-anonymous namespace. If called with three arguments, the
  feature will be loaded from the file specified by the third argument
  if it does not already exist in the namespace.  Otherwise, the feature
  will be loaded from a file given by the name of the feature, with
  ".sl" appended.

If after loading the file, if the feature is not present,
  a warning message will be issued.

EXAMPLE

require ("histogram");
    require ("histogram", "foo");
    require ("histogram", "foo", "/home/bob/hist.sl");
    require ("histogram", ,"/home/bob/hist.sl");

NOTES
  "feature" is an abstract quantity that is undefined here.

A popular use of the `require' function is to ensure that a specified
  file has already been loaded.  In this case, the feature is the
  filename itself.  The advantage of using this mechanism over using
  `evalfile' is that if the file has already been loaded, `require'
  will not re-load it.

${this.title}

Code Editor : require.hlp