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.