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# Debugging and Internals Access

See also

`neuron.nrn_dll()`

## Namespace Related

`name_declared`()
  Syntax:

    `type = name_declared("name")`

    `type = name_declared("name", 1)`

    `type = name_declared("name", 2)`

  Description:

    Return 0 if the name is not in the symbol table. The first form looks for names in the top level symbol table. The second form looks in the current object context. The last form also looks in the top level symbol table but is useful in Python to distinguish subtypes of variables which appear as doubles in HOC but internally are really not doubles and so cannot be pointed to by double*, eg. h.secondorder which is <type 'int'> or h.nseg which returns either `TypeError: Section access unspecified` or `nseg not a USERPROPERTY that can be pointed to`

    If the name exists return

    2 if an objref

    3 if a Section

    4 if a strdef

    5 if a scalar or double variable. (if second arg is not 2)

    > if second arg is 2

    > 5 if a scalar double

    > 6 if a double array

    > 7 if an integer

    > 8 if a section property

    1 otherwise

    Note that names can be (re)declared only if they do not already exist or are already of the same type. This is too useful to require the user to waste an objref in creating a `StringFunctions` class to use `is_name()`.

        name_declared("nrnmainmenu_")
        {object_push(nrnmainmenu_) print name_declared("ldfile", 0) object_pop()}
        {object_push(nrnmainmenu_) print name_declared("ldfile", 1) object_pop()}

`symbols`()
  Name:
    symbols --- type the names of HOC functions and variables
  Syntax:
    `symbols()`
  Description:
    Types a list of functions and variable names defined in HOC. Dimensions of arrays are also indicated.

  Warning

  No longer works. The nearest replacement is `SymChooser()` .

## Object Related

`object_id`()
  Syntax:

    `object_id(objref)`

    `object_id(objref, 1)`

  Description:

    Returns 0 if the object reference does not point to an object instance. (Otherwise returns the pointer cast to a double, not a very useful number)

    If the second argument is 1, it returns the index of the object name. Returns -1 if the object is the NULLObject.

`allobjectvars`()
  Syntax:
    `allobjectvars()`
  Description:
    Prints all the object references (objref variables) that have been declared along with the class type of the object they reference and the number of references.

  Warning

  Instead of printing the address of the object in hex format, it ought also to print the object_id and/or the internal instance name.

`allobjects`()
  Syntax:

    `allobjects()`

    `allobjects("templatename")`

    `nref = allobjects(objectref)`

  Description:

    Prints the internal names of all class instances (objects) available from the interpreter along with the number of references to them.

    With a templatename the list is restricted to objects of that class.

    With an object variable, nothing is printed but the reference count is returned. The count is too large by one if the argument was of the form templatename[index] since a temporary reference is created while the object is on the stack during the call.

`object_push`()
  Syntax:
    `object_push(objref)`
  Description:
    Enter the context of the object referenced by objref. In this context you can directly access any variables or call any functions, even those not declared as public. Do not attempt to create any new symbol names! This function is generally used by the object itself to save its state in a session.

`object_pop`()
  Syntax:
    `object_pop()`
  Description:
    Pop the last object from an `object_push()` .

## Miscellaneous

`hoc_pointer_`()
  Syntax:
    `hoc_pointer_(&variable)`
  Description:
    A function used by c and c++ implementations to request a pointer to the variable from its interpreter name. Not needed by the user.

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