<?xml version="1.0" encoding="utf-8" ?>
<!DOCTYPE erlref SYSTEM "erlref.dtd">

<erlref>
  <header>
    <copyright>
      <year>1996</year>
      <year>2013</year>
      <holder>Ericsson AB, All Rights Reserved</holder>
    </copyright>
    <legalnotice>
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
 
      http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

  The Initial Developer of the Original Code is Ericsson AB.
    </legalnotice>

    <title>erl_internal</title>
    <prepared>Robert Virding</prepared>
    <responsible>Bjarne D&auml;cker</responsible>
    <docno>1</docno>
    <approved>Bjarne D&auml;cker</approved>
    <checked></checked>
    <date>97-01-21</date>
    <rev>B</rev>
    <file>erl_internal.sgml</file>
  </header>
  <module>erl_internal</module>
  <modulesummary>Internal Erlang Definitions</modulesummary>
  <description>
    <p>This module defines Erlang BIFs, guard tests and operators.
      This module is only of interest to programmers who
      manipulate Erlang code.</p>
  </description>
  <funcs>
    <func>
      <name name="bif" arity="2"/>
      <fsummary>Test for an Erlang BIF</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>Name</anno>/<anno>Arity</anno></c> is an Erlang BIF
          which is automatically recognized by the compiler, otherwise
          <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="guard_bif" arity="2"/>
      <fsummary>Test for an Erlang BIF allowed in guards</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>Name</anno>/<anno>Arity</anno></c> is an Erlang BIF
          which is allowed in guards, otherwise <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="type_test" arity="2"/>
      <fsummary>Test for a valid type test</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>Name</anno>/<anno>Arity</anno></c> is a valid Erlang
          type test, otherwise <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="arith_op" arity="2"/>
      <fsummary>Test for an arithmetic operator</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>OpName</anno>/<anno>Arity</anno></c> is an arithmetic
          operator, otherwise <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="bool_op" arity="2"/>
      <fsummary>Test for a Boolean operator</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>OpName</anno>/<anno>Arity</anno></c> is a Boolean
          operator, otherwise <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="comp_op" arity="2"/>
      <fsummary>Test for a comparison operator</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>OpName</anno>/<anno>Arity</anno></c> is a comparison
          operator, otherwise <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="list_op" arity="2"/>
      <fsummary>Test for a list operator</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>OpName</anno>/<anno>Arity</anno></c> is a list
          operator, otherwise <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="send_op" arity="2"/>
      <fsummary>Test for a send operator</fsummary>
      <desc>
        <p>Returns <c>true</c> if <c><anno>OpName</anno>/<anno>Arity</anno></c> is a send
          operator, otherwise <c>false</c>.</p>
      </desc>
    </func>
    <func>
      <name name="op_type" arity="2"/>
      <fsummary>Return operator type</fsummary>
      <desc>
        <p>Returns the <c><anno>Type</anno></c> of operator that <c><anno>OpName</anno>/<anno>Arity</anno></c>
          belongs to, 
          or generates a <c>function_clause</c> error if it is not an 
          operator at all.</p>
      </desc>
    </func>
  </funcs>
</erlref>

