NAME

       erl_internal - Internal Erlang definitions.

DESCRIPTION

       This  module  defines  Erlang  BIFs,  guard  tests,  and operators. This module is only of
       interest to programmers who manipulate Erlang code.

EXPORTS

       add_predefined_functions(Forms) -> UpdatedForms

              Types:

                 Forms = [erl_parse:abstract_form() | erl_parse:form_info()]
                 UpdatedForms =
                     [erl_parse:abstract_form() | erl_parse:form_info()]

              Adds  to  Forms  the  code  for  the  standard  pre-defined  functions   (such   as
              module_info/0) that are to be included in every module.

       arith_op(OpName, Arity) -> boolean()

              Types:

                 OpName = atom()
                 Arity = arity()

              Returns true if OpName/Arity is an arithmetic operator, otherwise false.

       bif(Name, Arity) -> boolean()

              Types:

                 Name = atom()
                 Arity = arity()

              Returns true if Name/Arity is an Erlang BIF that is automatically recognized by the
              compiler, otherwise false.

       bool_op(OpName, Arity) -> boolean()

              Types:

                 OpName = atom()
                 Arity = arity()

              Returns true if OpName/Arity is a Boolean operator, otherwise false.

       comp_op(OpName, Arity) -> boolean()

              Types:

                 OpName = atom()
                 Arity = arity()

              Returns true if OpName/Arity is a comparison operator, otherwise false.

       guard_bif(Name, Arity) -> boolean()

              Types:

                 Name = atom()
                 Arity = arity()

              Returns true if Name/Arity is an Erlang BIF that is allowed  in  guards,  otherwise
              false.

       list_op(OpName, Arity) -> boolean()

              Types:

                 OpName = atom()
                 Arity = arity()

              Returns true if OpName/Arity is a list operator, otherwise false.

       op_type(OpName, Arity) -> Type

              Types:

                 OpName = atom()
                 Arity = arity()
                 Type = arith | bool | comp | list | send

              Returns  the  Type  of  operator  that  OpName/Arity  belongs  to,  or  generates a
              function_clause error if it is not an operator.

       send_op(OpName, Arity) -> boolean()

              Types:

                 OpName = atom()
                 Arity = arity()

              Returns true if OpName/Arity is a send operator, otherwise false.

       type_test(Name, Arity) -> boolean()

              Types:

                 Name = atom()
                 Arity = arity()

              Returns true if Name/Arity is a valid Erlang type test, otherwise false.