strings parameters in C++ subroutine

[John W. Eaton]

On 29-Sep-1999, Don Fisher <address@hidden> wrote:

| How does one convert a string parameter to a standard null terminated C
| type string. I have been able to decode numeric values using 
| 
| value = (int) args(1).double_value();
| 
| type calls. But I do not know how to construct the same for character
| strings.

For a single string, you can use something like

  string str = args(1).string_value ();

  char *c_str = str.c_str ();

For a vector of strings, you can use

  string_vector str_vec = args(1).all_strings ();

(I know, it should probably be called `string_vector_value', not
`all_strings').  These methods are declared in ov.h.

| Is there documentation on how the arg lists and return value lists are
| formatted?

Unfortuantely, the only real documentation on Octave internals is the
source.

jwe



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