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

<erlref>
  <header>
    <copyright>
      <year>1996</year>
      <year>2020</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>1997-01-21</date>
    <rev>B</rev>
    <file>erl_internal.xml</file>
  </header>
  <module since="">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="add_predefined_functions" arity="1" since="OTP 20.0"/>
      <fsummary>Add code for pre-defined functions.</fsummary>
      <desc>
        <p>Adds to <c><anno>Forms</anno></c> the code for the standard
        pre-defined functions (such as <c>module_info/0</c>) that are
        to be included in every module.</p>
      </desc>
    </func>

    <func>
      <name name="arith_op" arity="2" since=""/>
      <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="bif" arity="2" since=""/>
      <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 that is automatically recognized by the compiler,
          otherwise <c>false</c>.</p>
      </desc>
    </func>

    <func>
      <name name="bool_op" arity="2" since=""/>
      <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" since=""/>
      <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="guard_bif" arity="2" since=""/>
      <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 that is allowed in guards, otherwise <c>false</c>.</p>
      </desc>
    </func>

    <func>
      <name name="list_op" arity="2" since=""/>
      <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="op_type" arity="2" since=""/>
      <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.</p>
      </desc>
    </func>

    <func>
      <name name="send_op" arity="2" since=""/>
      <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="type_test" arity="2" since=""/>
      <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>
  </funcs>
</erlref>

